Download or read book Magnetic Interactions in Transition Metal Dichalcogenides written by Oscar Rodrigo Avalos Ovando and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Anisotropic Magnetic Interactions in 4d5 and 5d5 Transition Metal Systems written by Ravi Yadav and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Magnetic interactions and ordering in some transition metal alloys written by Pon-Wei Hou and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Recent Advances In Magnetism Of Transition Metal Compounds Festschrift In Honour Of Professor K Motizuki written by Akio Kotani and published by World Scientific. This book was released on 1993-03-18 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a Festschrift in honour of Professor Kazuko Motizuki on the occasion of her retirement from Osaka University. She has been active in a variety of branches of solid state physics and, in particular, has made an important contribution to the theory of magnetism. The book reviews recent advances in magnetism of transition metal compounds, both for itinerant electron systems and localized spin systems. For the former systems, band calculational methods, correlation effects, and theoretical aspects of photoemission spectroscopy are reviewed generally, and then recent progress in the theoretical and experimental understanding of magnetic properties of various kinds of intermetallic compounds and intercalation compounds of transition-metal dichalcogenides are reviewed in detail. For the latter systems, attention is focused on quantum effects, frustration and competing interaction in low-dimensional systems. Main subjects treated in the book are Haldane gap-systems, singlet-ground-state systems, triangular spin systems, and quantum spin chains with competing interactions.

Download or read book Two Dimensional Transition Metal Dichalcogenides written by Alexander V. Kolobov and published by Springer. This book was released on 2016-07-26 with total page 545 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes the current status of theoretical and experimental progress in 2 dimensional graphene-like monolayers and few-layers of transition metal dichalcogenides (TMDCs). Semiconducting monolayer TMDCs, due to the presence of a direct gap, significantly extend the potential of low-dimensional nanomaterials for applications in nanoelectronics and nano-optoelectronics as well as flexible nano-electronics with unprecedented possibilities to control the gap by external stimuli. Strong quantum confinement results in extremely high exciton binding energies which forms an interesting platform for both fundamental studies and device applications. Breaking of spatial inversion symmetry in monolayers results in strong spin-valley coupling potentially leading to their use in valleytronics. Starting with the basic chemistry of transition metals, the reader is introduced to the rich field of transition metal dichalcogenides. After a chapter on three dimensional crystals and a description of top-down and bottom-up fabrication methods of few-layer and single layer structures, the fascinating world of two-dimensional TMDCs structures is presented with their unique atomic, electronic, and magnetic properties. The book covers in detail particular features associated with decreased dimensionality such as stability and phase-transitions in monolayers, the appearance of a direct gap, large binding energy of 2D excitons and trions and their dynamics, Raman scattering associated with decreased dimensionality, extraordinarily strong light-matter interaction, layer-dependent photoluminescence properties, new physics associated with the destruction of the spatial inversion symmetry of the bulk phase, spin-orbit and spin-valley couplings. The book concludes with chapters on engineered heterostructures and device applications such as a monolayer MoS2 transistor. Considering the explosive interest in physics and applications of two-dimensional materials, this book is a valuable source of information for material scientists and engineers working in the field as well as for the graduate students majoring in materials science.

Download or read book Magnetic Interactions Between Transition Metal Impurities and Clusters Mediated by Low dimensional Metallic Hosts A First Principles Theoretical Investigation written by Lucila Maitreya Juárez Reyes and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book MODIFICATION OF TRANSITION METAL DICHALCOGENIDES OPTICAL ELECTRICAL AND MAGNETIC PROPERTIES THROUGH ALLOYING written by Mingzu Liu and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation focuses on two-dimensional (2D) transition metal dichalcogenides (TMDs), and studies the modification of their physical properties through the method of substitutional doping/alloying. The controlled synthesis and novel properties such as room-temperature ferromagnetism in doped/alloyed 2D TMD systems are investigated. Two notes are addressed here: 1) The general concept of TMDs contains a large family of binary compounds, while we are mainly concentrated on the semiconducting members (sTMDs) inside, including MoS2, WS2, MoSe2, and WSe2. 2) The term of alloying is applied here to denote the situation where impurity atoms are incorporated intentionally into the host 2D lattice, with a concentration greater than 1 at%, while conventionally, the term of doping is only adapted to describe similar cases but with significantly lower concentrations less than 1 at%, and even less than 1000 ppm = 0.1 at% in some literatures. However, a clear quantitative classification between the two concepts does not exist, and we will study cases with a wide range of impurity concentrations in this dissertation. Therefore, we will indiscriminately use both the terms of doping and alloying for convenience, regardless of the exact concentration/amount of impurity atoms. The main context of this dissertation is outlined as follows. In Chapter 1, we will introduce the fundamentals of 2D TMD materials and techniques for 2D surface characterizations. 2D magnetism is one of the most active fields in condensed matter physics, and will be a major topic of our research, thus a brief introduction in principles of magnetic materials will also be given. Controllable substitutional doping/alloying in monolayer 2D materials is a prerequisite to any further characterizations and applications. In Chapter 2, we will first introduce the liquid-phase precursor-assisted chemical vapor deposition (CVD) method we developed for universal substitutional doping with tunable dopant concentrations in sTMDs. Different dopant elements are successfully incoporated in sTMD monolayers, and the defect types and optical properties are studied. It is then discovered that the edge termination in single crystal sTMD monolayers will greatly affect the spatial distribution of dopant atoms, and this effect is elucidated through the synthesis of doped hexagonal sTMD monolayers that have as-grown domains with different dopant concentrations. Combined with the solution-based CVD method we developed, the edge termination can be utilized for engineering in-plane heterojunctions that display fascinating electronic, optoelectronic, and magnetic properties. Long-range ferromagnetic ordering has been considered as hard to achieve for a long time in 2D systems, especially at room temperature. In Chapter 3, we will demonstrate room-temperature ferromagnetism in vanadium-doped (V-doped) sTMD monolayers and its coupling with the thermal, optical, and electrical properties. The magnetization is dependent on both the dopant concentration and temperature, and an abnormal crossover in the hysteresis loop of monolayer V-WSe2 is described, which is attributed to a strong 2D thermally induced spin flip phenomenon. The ferromagnetism is induced by indirect exchange interactions between V moments, which are mediated by hole carriers. It is then revealed that optical excitations creating excess hole carriers can be used to control the magnetization. Finally, we attempt on applying the induced magnetization to break the degeneracy in the valley degrees of freedom through a circularly polarized photoluminescence (PL) experiment, and look into the effect of magnetization on the optical emissions. The 2D magnetic systems based on V-doped sTMD monolayers hold great promise for novel magneto-electronic or magneto-optical devices, as well as offering a platform for fundamental physical studies. Magnetic domain structure is an inherent phenomenon in finite-size ferromagnetic systems. In Chapter 4, we will discuss the direct visulization of magnetic domains in Vdoped sTMD monolayers. Magnetic force microscopy (MFM) is first used in the tentative observation of domain structures experimentally, and a mathematical model is proposed to estimate the signal level. Lorentz transmission electron microscopy (Lorentz-TEM) is then used, and the observation of an field-dependent reversible domain contrast is reported in monolayer V-WS2. The contrast signal is revealed to be highly affected by the sample magnetization orientation and charge doping, which are mainly determined by the dopant concentration, beam-sample interactions and the type of substrates. Atomic-resolution electron microscopy is finally performed to detect potential connections between lattice atomic motions and macroscopic magnetization. The observed contrast signals on V-doped sTMD provide primary knowledge in domain structures of 2D diluted magnetic systems, and is the first reported imaging of a monolayer magnetic material through Lorentz-TEM. Finally, Chapter 5 summarizes the studies discussed in this dissertation, and provides outlooks to potential continuing future works.

Download or read book Advanced Course on Magnetic Exchange Interactions in Transition Metal Compounds written by and published by . This book was released on 1965 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Comparative Study of 3d intercalated Transition Metal Dichalcogenides by Magnetic Transport and Electronic Properties written by Deepak Sapkota (Researcher in physics) and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intercalation of transition metal dichalcogendies (TMDCs) by 3d-transition metals has been studied systematically. We mainly focus on intercalation into two host TMDCs 2H-NbS2 and 2H-TaS2 which are layered materials where the metal ions are in trigonal prismatic environment of chalcogens, the layers are separated by weak van der Waals force. So, foreign atoms or molecules can be inserted in between the layers of the TMDCs. The un-intercalated NbS2 shows superconductivity below 6 K whereas TaS2 exhibits coexistence of the superconductivity (Tc̳=0.8 K) with charge density wave phase (TC̳D̳W̳=75 K). In this research, the NbS2 is intercalated by V atom with formula unit V0.3NbS2, while TaS2 by Cr with formula unit Cr1/3TaS2. Upon the intercalation, the electronic as well as magnetic structure of host materials are likely to be modified. It is believed that the charge transfer between the 3d-intercalant and host TMDC, specifically the d-band of Nb or Ta, just causes an increase in chemical potential without altering the band structure and shape and size of Fermi surface, also known as rigid band model. And, the local moment in magnetic ion gives rise to magnetism via RKKY interaction. In order to examine the effect of intercalation in V0.3NbS2 and Cr1/3TaS2, we investigated the magnetic, transport, and electronic properties. In V0.3NbS2, which crystallizes in P-31m space group, we observed canted antiferromag-netic (weak ferromagnetic) magnetic ordering with majority of charge carriers as hole type. From ARPES measurements, additional bands are appeared to cross the Fermi level and shape and size of the Fermi surface are modified as compared to NbS2. Also, V-3d states are present near the Fermi level. These findings demonstrate that the simple rigid band picture is not viable in V0.3NbS2 compound. Moreover, from the photon dependent ARPES measurements strong kz̳ dispersion is found in contrast to that of host NbS2. Similarly, intercalated Cr1/3TaS2 crystallizes in P6322 space group orders ferromagnetically. Surface structure is investigated by STM, LEED, and core level photoemmission experiments. The resonant photoemmission and ARPES measurements are performed to examine the effect of charge transfer between Cr and TaS2 layer.

Download or read book Magnetic Properties of Layered Transition Metal Compounds written by L.J. de Jongh and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last two decades low-dimensional (low-d) physics has matured into a major branch of science. Quite generally we may define a system with restricted dimensionality d as an object that is infinite only in one or two spatial directions (d = 1 and 2). Such a definition comprises isolated single chains or layers, but also fibres and thin layers (films) of varying but finite thickness. Clearly, a multitude of physical phenomena, notably in solid state physics, fall into these categories. As examples, we may mention: • Magnetic chains or layers (thin-film technology). • Metallic films (homogeneous or heterogeneous, crystalline, amorphous or microcristalline, etc.). • I-d or 2-d conductors and superconductors. • Intercalated systems. • 2-d electron gases (electrons on helium, semiconductor interfaces). • Surface layer problems (2-d melting of monolayers of noble gases on a substrate, surface problems in general). • Superfluid films of ~He or 'He. • Polymer physics. • Organic and inorganic chain conductors, superionic conductors. • I-d or 2-d molecular crystals and liquid crystals. • I-d or 2-d ferro- and antiferro electrics.

Download or read book 2D Materials written by Phaedon Avouris and published by Cambridge University Press. This book was released on 2017-06-29 with total page 521 pages. Available in PDF, EPUB and Kindle. Book excerpt: Learn about the most recent advances in 2D materials with this comprehensive and accessible text. Providing all the necessary materials science and physics background, leading experts discuss the fundamental properties of a wide range of 2D materials, and their potential applications in electronic, optoelectronic and photonic devices. Several important classes of materials are covered, from more established ones such as graphene, hexagonal boron nitride, and transition metal dichalcogenides, to new and emerging materials such as black phosphorus, silicene, and germanene. Readers will gain an in-depth understanding of the electronic structure and optical, thermal, mechanical, vibrational, spin and plasmonic properties of each material, as well as the different techniques that can be used for their synthesis. Presenting a unified perspective on 2D materials, this is an excellent resource for graduate students, researchers and practitioners working in nanotechnology, nanoelectronics, nanophotonics, condensed matter physics, and chemistry.

Download or read book Advanced Course on Magnetic Exchange Interactions in Transition Metal Compounds written by Netherlands-Norwegian Reactor School and published by . This book was released on 1964* with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book MAGNETIC EXCHANGE INTERACTIONS IN DIMERIC AND POLYMERIC TRANSITION METAL COMPLEXES written by and published by . This book was released on 1974 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Magnetic Exchange Interactions in Bridged Transition Metal Dimers written by James R. Hart and published by . This book was released on 1990 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Magnetic Exchange Interactions and Valence Chemistry in Binuclear Transition Metal Complexes written by Susan Lee Lambert and published by . This book was released on 1981 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Two Dimensional Transition Metal Dichalcogenides written by Narayanasamy Sabari Arul and published by Springer. This book was released on 2019-07-30 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents advanced synthesis techniques adopted to fabricate two-dimensional (2D) transition metal dichalcogenides (TMDs) materials with its enhanced properties towards their utilization in various applications such as, energy storage devices, photovoltaics, electrocatalysis, electronic devices, photocatalysts, sensing and biomedical applications. It provides detailed coverage on everything from the synthesis and properties to the applications and future prospects of research in 2D TMD nanomaterials.

Download or read book Magnetic Exchange Interactions and Mixed Valence Chemistry in Binuclear Transition Metal Complexes written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: