Download or read book Nuclear Magnetic Resonance Studies of the High Temperature Superconductors in the Normal and Superconducting States written by Nicholas James Curro and published by . This book was released on 1998 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Magnetism and Superconductivity in Iron based Superconductors as Probed by Nuclear Magnetic Resonance written by Franziska Hammerath and published by Springer Science & Business Media. This book was released on 2012-08-31 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nuclear Magnetic Resonance (NMR) has been a fundamental player in the studies of superconducting materials for many decades. This local probe technique allows for the study of the static electronic properties as well as of the low energy excitations of the electrons in the normal and the superconducting state. On that account it has also been widely applied to Fe-based superconductors from the very beginning of their discovery in February 2008. This dissertation comprises some of these very first NMR results, reflecting the unconventional nature of superconductivity and its strong link to magnetism in the investigated compounds LaO1–xFxFeAs and LiFeAs.
Download or read book Nuclear Magnetic Resonance Studies of High Temperature Superconductors written by Krzysztof R. Górny and published by . This book was released on 1999 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selected Topics On Superconductivity written by L C Gupta and published by World Scientific. This book was released on 1993-04-30 with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contents:The First Five Years of High-Tc Superconductivity (K A Müller)Different Factors which Govern the Optimisation of High-Tc Superconductive Cuprates Involving Bi-, Tl or Pb (B Raveau, M Hervieu, C Michel, J Provost, A Maignan, C Simon & D Groult)Superconductivity in Cuprates and Other Oxides (H R Ott)Organic Superconductors with Tc Higher than 10K (T Ishiguro & Y Nogami)Fundamentals of RVB Theory and Some Applications to High Temperature Superconductors (G Baskaran)Anyons and Superconductivity (S Das Sarma)Mott Transition in the Hubbard Model (B S Shastry)Superconducting Pairing in Layered Superconductors (S S Jha)Breaking the Log-Jam in Many-Body Physics: Fermi Surfaces Without Fermi Liquids (P W Anderson)Superconductivity in High Magnetic Fields from a Microscopic Theory (A K Rajagopal)Nonequilibrium Superconductivity (R Tidecks)Neutron Scattering Study of the High-Tc Superconducting System YBa2Cu3O6+x (J Rossat-Mignod et al.)Crystal-Field Excitations in High-Tc Superconducting Materials (A Furrer)Superconducting Granular Films (S-I Kobayashi)Transport Properties in the Mixed State of High Temperature Superconductors (A Freimuth)Physics of Josephson Effect and Recent Advances (A Barone & S Pagano)Tunneling Spectroscopy of Copper Oxide Superconductors (T Ekino & J Akimitsu)Superconductivity and Magnetism in Heavy-Fermion Compounds (F Steglich, U Ahlheim, C D Bredl, C Geibel, M Lang, A Loidl & G Sparn)Nuclear Magnetic Resonance Studies in Highly Correlated Systems: Heavy Fermion and High-Tc Superconductors (K Asayama)Pulsed Laser and Cylindrical Magnetron Sputter Deposition of Epitaxial Metal Oxide Thin Films (T Venkatesan et al.) Readership: Physicists, chemists and engineers. keywords:
Download or read book Advances in Theoretical and Experimental Research of High Tc Superconductivity written by Han Rushan and published by World Scientific Publishing Company. This book was released on 2019 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: Researchers working at the frontier of high-Tc Superconductors have reviewed the development in this area in the past 20 years. Both experimental and theoretical aspects have been covered. New directions and possible theoretical models were suggested. The contributors of this book are from China Center of Advanced Science and Technology (CCAST); Institute of Physics Chinese Academy of Sciences (CAS); National Lab for Superconductivity, Institute of Physics, CAS; School of Physics, Peking University and Center of Advanced Study Tsinghua University. This volume will be a useful guide to those who are working in the field.
Download or read book Handbook of High Temperature Superconductivity written by J. Robert Schrieffer and published by Springer Science & Business Media. This book was released on 2007-03-20 with total page 627 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the 1980s, a general theme in the study of high-temperature superconductors has been to test the BCS theory and its predictions against new data. At the same time, this process has engendered new physics, new materials, and new theoretical frameworks. Remarkable advances have occurred in sample quality and in single crystals, in hole and electron doping in the development of sister compounds with lower transition temperatures, and in instruments to probe structure and dynamics. Handbook of High-Temperature Superconductvity is a comprehensive and in-depth treatment of both experimental and theoretical methodologies by the the world's top leaders in the field. The Editor, Nobel Laureate J. Robert Schrieffer, and Associate Editor James S. Brooks, have produced a unified, coherent work providing a global view of high-temperature superconductivity covering the materials, the relationships with heavy-fermion and organic systems, and the many formidable challenges that remain.
Download or read book Oxygen 17 Nuclear Magnetic Resonance Studies of High Temperature Superconductors written by Christopher Nicholas Coretsopoulos and published by . This book was released on 1989 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study presents $\sp{17}$O NMR spectra of randomly and magnetically oriented samples of various high-$T\sb{c}$ superconductors. Systems under investigation include: (BaK)BiO$\sb3$, La$\sb{1.85}$Sr$\sb{0.15}$CuO$\sb4$, YBa$\sb2$Cu$\sb3$O$\sb{\rm 7-x}$, Bi$\sb2$Sr$\sb2$CaCu$\sb2$O$\sb8$ and Tl$\sb2$Ba$\sb2$CaCu$\sb2$O$\sb8$. Measurements of the angular dependence of the oxygen frequency shifts and corresponding satellite transitions have enabled us to assign the oxygen sites of magnetically oriented YBa$\sb2$Cu$\sb3$O$\sb{\rm 7-x}$, as well as determine the e.f.g. parameters for various sites. The temperature and angular dependence of the oxygen frequency shifts and relaxation rates have been studied as well as the effect of the oxygen stoichiometry and rare earth substitutions. Finally, we have compared the $\sp{17}$O frequency shifts of YBa$\sb2$Cu$\sb3$O$\sb{\rm 7-x}$ to those of the precursor oxides, and other high-$T\sb{c}$ compounds, and have consistently observed a paramagnetically shifted feature associated with the CuO$\sb2$ planes ($\sim$2000 ppm from H$\sb2$O) and a second feature or set of features in the diamagnetic region (typically at $\sim$400 ppm from H$\sb2$O) which are attributed to sites other than the CuO$\sb2$ planes. Precursor effects in the normal phase of YBa$\sb2$Cu$\sb3$O$\sb{\rm 7-x}$ are investigated, pointing strongly to antiferromagnetic fluctuations which may persist in the superconductive phase.
Download or read book Studies of High Temperature Superconductors written by Anant Narlikar and published by Nova Publishers. This book was released on 1999 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies Of High Temperature Superconductors Volume 29 -- Advances In Research & Applications
Download or read book Studies of High Temperature Superconductors written by A. V. Narlikar and published by Nova Publishers. This book was released on 1993 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: Six papers by physicists from the Japan, India, Brazil and the US address some of the broad frontal issues of superconductivity, which include the mechanisms of high-temperature superconductivity, extra-high-temperature phenomena, the normal state pseudogap, the observations of the isotope effect in a host of different superconducting systems and their explanations, and the unusual features of strongly correlated electron systems like heavy fermions. Two extended papers explore the importance of positron annihilation and using electron spin resonance techniques to study superconducting materials. The treatments should be accessible to working scientists and engineers and to graduate students of physics, chemistry, materials science, solid-state electronics, and other disciplines.
Download or read book Nuclear Magnetic Resonance Study of High Temperature Superconductivity written by Yiqiao Song and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Magnetic Resonance Studies of High Temperature Superconductors in High Magnetic Fields written by Henry Nathaniel Bachman and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation reports on nuclear magnetic resonance (NMR) experiments of high temperature superconductors (HTS) in the presence of high magnetic fields ranging from 2.1 T up to 27.3 T.
Download or read book Nuclear Magnetic Resonance Studies of the Effect of Vortices on the High Temperature Superconductor YBa2 Cu3 O7 written by Craig Thomas Milling and published by . This book was released on 2001 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Magnetic Resonance Study of the Onset of Superconductivity and Low Energy Excitations in High Temperature Superconductors written by Vesna F. Mitrović and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In the vortex core region, we find that the NMR rate is strongly enhanced in high magnetic fields implying the existence of some sort of bound state in the vortex core.
Download or read book Physical Properties Of High Temperature Superconductors Ii written by Donald M Ginsberg and published by World Scientific. This book was released on 1990-02-01 with total page 718 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the publication of Physical Properties of High Temperature Superconductors I, research in the field of high temperature superconductivity has continued at a rapid pace. Volume II will contain chapters on some of the major areas of activity which were not covered extensively in Volume I: structure, microstructure, thermodynamics, oxygen stoichiometry effects, nuclear magnetic and quadrupole resonance, Hall effect, electronic structure, and the pairing state. Like Volume I, it will present authoritative and comprehensive reviews written by recognized experts in the field. This book should be useful to all students, scientists, and engineers who desire to know more about high temperature superconductivity.
Download or read book Nuclear Magnetic Resonance written by and published by . This book was released on 1995 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: NMR experiments are reported for Sr2CuO2Cl2, HgBa2CuO{sub 4+d}, YNi2B2C and YBa2Cu3O--. NMR studies typify three different aspects of microscopic properties of HTSC. In non-superconducting antiferromagnetic (AF) prototype Sr2CuO2Cl2, we used NMR to investigate Cu{sup 2+} correlated spin dynamics and AF phase transition in CuO2 layers. In the superconductors, we used NMR both to investigate the electronic properties of the Fermi-liquid in normal and superconducting states and to investigate flux lattice and flux-line dynamics in the superconducting state in presence of magnetic field. A summary of each study is given: 35Cl NMR was measured in Sr2CuO2Cl2 single crystals with T{sub N}=257K. 35Cl NMR relaxation rates showed crossover of Cu{sup 2+} spin dynamics from Heisenberg to XY-like correlation at 290 K well above T{sub N}. A field-dependent T{sub N} for H(up tack)c was observed and explained by a field-induced Ising-like anisotropy in ab plane. 199Hg NMR was measured in HgBa2CuO{sub 4+d}. Properties of the Fermi-liquid are characterized by a single-spin fluid picture and opening of a spin pseudo-gap at q=0 above {Tc}. Below {Tc}, spin component of Knight shift decreases rapidly in agreement with prediction for d-wave pairing scheme. 11B and 89Y NMR/magnetization were measured in YNi2B2C. Temperature dependence of 11B Knight shift and of the NSLR gave a normal state which agrees with the Korringa relation, indicating that the AF fluctuations on the Ni sublattice are negligible. Opening of the superconducting gap obeys BCS. A NMR approach to investigate vortex thermal motion in HTSC is presented, based on contribution of thermal flux-lines motion to both T2−1 and T1−1. Effects are demonstrated in YBa2Cu3O-- and HgBa2CuO{sub 4+d}.
Download or read book A 170 Nuclear Magnetic Resonance Study of High Temperature Superconductors written by Andrew Paul Howes and published by . This book was released on 1992 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NMR Study on a Quarter Filled Organic Superconductor Charge Ordering Superconductivity and the FFLO State in a Layered Superconductor written by Hsin-Hua Wang and published by . This book was released on 2018 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to the low dimensionality of molecular conductors, they are categorized into a class of materials with strong electron correlation, namely Coulomb repulsion. The pairing mechanism of unconventional superconductors (SCs), which commonly arises in these compounds, is a central and unresolved problem in condensed matter physics. Whereas numerous unconventional SCs exist in the vicinity of magnetic ground states, we investigate whether magnetic ordering or fluctuation is a necessary ingredient of unconventional superconductivity, as well as whether other mechanisms such as the charge degree of freedom can play a role. Moreover, the low dimensionality of molecular conductors also allows us to study a long-sought-after inhomogeneous high field superconducting phase, the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. $\beta"$-(BEDT-TTF)$_2$SF$_5$CH$_2$CF$_2$SO$_3$ ($\beta"$-SC) that belongs to the family of molecular conductors, is an ideal candidate for studies of both topics. Nuclear magnetic resonance (NMR) is one of the few possible microscopic experimental probes for studying molecular conductors. In this dissertation, interesting physics in $\beta"$-SC, in the contexts such as charge-fluctuation mediated superconductivity and the fluctuating nature of the FFLO state, is revealed by NMR. Specifically, our results on $\beta"$-SC are consistent with an unconventional superconducting state with singlet pairing and nodal superconducting gap. Moreover, absent or barely distinguishable evidence of magnetic fluctuations are observed above superconducting transition temperature $T_c$, unlike in most other unconventional SCs, including high $T_c$ cuprate SCs. In the normal state, $\beta"$-SC is a charge-ordered metal revealed by NMR spin lattice relaxation rate $(T_1T)^{-1}$. The charge disproportionation forms a stripe pattern along the $a$ axis, whereas the disproportionation increases monotonically upon cooling to $T_c$. Above $T_c$, $\beta"$-SC exhibits only moderate antiferromagetic correlation from analysis of Korringa ratio $\varkappa\sim2$. Motion of the ethylene end groups is studied by $^2$H NMR above 100 K, and is found to induce an enhanced $(T_1T)^{-1}$ on $^{13}$C through modifying the electron correlation. The response of $(T_1T)^{-1}$ to pressure shows that charge disproportionation is suppressed at high pressures as well as $T_c$ according to previous reports, indicating the possible interplay between charge disproportionation and superconductivity. In the FFLO state, when the orbital pair breaking effect is suppressed under in-plane magnetic field, we observe an unusual enhancement of $(T_1T)^{-1}$ above the normal state $(T_1T)^{-1}$, at the verge of the FFLO--uniform SC phase boundary. Moreover, we observe an enhancement that is 2.5 times the normal state $(T_1T)^{-1}$ under 1 degree misaligned field at $B=9.25$ T. We conclude that both in-plane and out-of-plane $(T_1T)^{-1}$ enhancements in the FFLO state originate from hyperfine coupling to the electrons. We propose a picture of a fluctuating FFLO state where the enhancement of $(T_1T)^{-1}$ is caused by a fluctuating magnetic field induced by dynamics of short-range modulations of the superconducting order parameter.
