Showing papers on "High-temperature superconductivity published in 1978"
Book•
01 Oct 1978
TL;DR: In this article, the authors studied the role of pressure in the phase transition of a single-impurity transition in LaCe and YCe under high pressure, and the effect of high pressure on the sensitivity of soft mode transitions in solids.
Abstract: Hydrogen and Metal-Hydrides.- Prospects for Metallic Hydrogen.- Metallic Hydrogen: Recent Theoretical Progress.- High Hydrogen Pressures in Superconductivity.- Fermi Surface and Magnetism.- The Role of Pressure in the Study of the Fermi Surface.- Electronic Structures of Ferromagnetic 3d-Transition Metals at Normal and High Pressures.- Neutron Scattering at High Pressure in Singlet-Triplet Systems.- Some Magnetization Studies at High Hydrostatic Pressures.- Pressure-Induced Electronic Transition in CeAl2.- Valence Instabilities.- Valence Instabilities of Rare Earth Ions in Metals.- Theoretical Approach to the Configuration Fluctuation in Sm-Chalcogenides.- The ?-? Phase Transitions in Ce-Th Alloys under High Pressure.- The Pressure Dependence of the Magnetic Susceptibility of Rare Earth Substituted Samarium Sulfide.- Pressure Dependence of Crystal Field Parameters in Rare Earth Intermetallic Compounds.- Pressure Induced Spin-Glass?Single-Impurity Transition in LaCe, Superconductivity in LaCe and YCe under Pressure.- Tricritical Behavior and Soft Mode Transitions.- Stress Effects on Critical Behaviour.- Tricritical Point in KDP.- Investigation of the Tricritical Point of KDP under Pressure.- High Pressure Studies of Soft Mode Transitions in Solids.- Pressure Dependence of Raman Scattering in Ferroelectrics and Ferroelastics.- Brillouin Scattering at High Pressures.- Superconductivity and Structural Instabilities.- Anharmonicity in A15 Superconductors: A Thermal Expansion Approach.- High Pressure Structural and Lattice Dynamical Investigations at Reduced Temperatures.- High Temperature Superconductivity and Instabilities.- The Isothermal Pressure Derivatives of the Elastic Shear Modulus for V3Si.- LaAg under Hydrostatic Pressure: Superconductivity and Phase Transformation.- Superconductivity.- Pressure Dependencies of the Superconducting and Magnetic Critical Temperatures of Ternary Rhodium Borides.- The AuGa2 Dilemma - Superconducting Version.- Superconductivity of BCC Barium under Pressure.- Superconducting Behaviour of Nb3Ge thin Films under Hydrostatic Pressure.- Pressure Dependence of Tc in the Superconducting A15 Compounds V75-xTMxGa25 (TM = Cr, Mn, Fe, and Co).- Superconductors and Semiconductors.- New Hypothesis Concerning the Commencement of the Rare Earth Series at High Pressure.- Pressure-Induced Covalent-Metallic Transitions.- New Hydrostatic Pressure Results on Sulfur Impurity Center in GaSb.- Low Temperature Light Induced Change of the Chlorine Center Configuration in CdTe.- Techniques.- Narrow Gap Semiconductors as Low Temperature Pressure Gauges.- Bi Phase Transitions below 80K to 150 Kbar in an Ar Pressure Medium.- Piston-Cylinder Apparatus Operating at Liquid Helium Temperature.- He3 Cryostat with High Pressure Hydrogen Chamber for Superconductivity Measurements in Metal-Hydrogen Alloys.- Effects of Pressure, Temperature and Defect Concentration on Positron Behavior in Metals.- Low Dimension Conductors.- Dimensionality Effects and Physical Properties in 1D Compounds.- Neutron Diffraction Study of the Compressibility of TTF-TCNQ and KCP under Hydrostatic Pressures up to about 20 Kbar.- The Role of Librations in TTF-TCNQ.- The Commensurate-Incommensurate Phase Transition.- Conference Review.- The Conference: One Man's View.- Conference Attendees.
64 citations
Journal Article•
TL;DR: The dissipative part of the conductivity tensor in extremely pure superconductors at low temperatures has a peak at a frequency ω 2/E/sub F, due to the presence of bound states in the vortex cores as discussed by the authors.
Abstract: The dissipative part of the conductivity tensor in extremely pure superconductors at low temperatures has a peak at a frequency ..omega..approx...delta../sup 2//E/sub F/, due to the presence of bound states in the vortex cores.
17 citations
TL;DR: In this paper, a new mechanism of superconductivity is proposed based on the formation of "metallic excitonium", an excitonic phase in a semiconductor or semimetal with m h m e ≳ 100.
Abstract: A new mechanism of superconductivity is proposed based on the formation of “metallic excitonium”, an excitonic phase in a semiconductor or semimetal with m h m e ≳ 100
15 citations
14 citations
TL;DR: The specific heat of the novel high temperature superconductor Y0.7Th0.3C1.58 (Tc = 17.0 K) has been measured between 4 and 22 K as discussed by the authors.
8 citations
TL;DR: The anomalous bulk metallic phase of CuCl which has been reported by several workers to exist at pressures near 40 kbar is explained in terms of Guinier-Preston transitional precipitates consisting of a small amount of Cu obtained from the partially arrested disproportionation reaction as discussed by the authors.
Abstract: The anomalous bulk metallic phase of CuCl which has been reported by several workers to exist at pressures near 40 kbar is explained in terms of Guinier-Preston transitional precipitates consisting of a small amount of Cu obtained from the partially arrested disproportionation reaction 2 CuCl → Cu + CuCl 2 . The absence of superconductivity in bulk Cu suggests that reports of large diamagnetic susceptibilities near 100–250 K in the metallic phase may be of doubtful validity.
8 citations
Journal Article•
TL;DR: In this article, it was shown that in superconductors with small dielectric gap on the Fermi surface, the upper critical magnetic field can exceed the Clogston-Chandrashekhar paramagnetic limit.
Abstract: It is shown that in superconductors with small dielectric gap on the Fermi surface the upper critical magnetic field can exceed the Clogston-Chandrashekhar paramagnetic limit.
4 citations
01 Jan 1978
TL;DR: In this article, high pressure experiments in a hydrostatic environment testing these models are reviewed and discussed, and new data on single crystalline V3Si and polycrystalline Nb3Sn1-xYx(Y = Al and Sb) are also included.
Abstract: It is known that high temperature superconductors are unstable, Different models have been proposed to explain the high temperature superconductivity and instabilities. High pressure experiments in a hydrostatic environment testing these models are reviewed and discussed. New data on single crystalline V3Si and polycrystalline Nb3Sn1-xYx(Y = Al and Sb) are also included. Although no unique picture emerges at the present time, existing high pressure results tend to lend support to the electron model emphasizing the roles of electrons. Further experiments are proposed and planned for better understanding of the origin of high temperature superconductivity and instabilities, and their correlation.
3 citations
1 citations