scholarly journals Imaging nanoscale Fermi-surface variations in an inhomogeneous superconductor

2009 ◽  
Vol 5 (3) ◽  
pp. 213-216 ◽  
Author(s):  
W. D. Wise ◽  
Kamalesh Chatterjee ◽  
M. C. Boyer ◽  
Takeshi Kondo ◽  
T. Takeuchi ◽  
...  
Keyword(s):  
Fermi Surface ◽  
Inhomogeneous Superconductor

scholarly journals The Stratified Superconductivity in Ba0.6K0.4BiO3 Single Crystal: Direct Measurement of Energy Gap between Homo-, and Inhomogeneous States

2014 ◽  
Vol 2014 ◽  
pp. 1-9
Author(s):  
L. N. Zherikhina ◽  
A. M. Tskhovrebov ◽  
L. A. Klinkova ◽  
D. A. Balaev ◽  
S. I. Popkov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Fermi Surface ◽  
Single Crystal ◽  
Superconducting State ◽  
Energy Gap ◽  
Electric Transport ◽  
Josephson Tunneling ◽  
Josephson System ◽  
First Time ◽  
Inhomogeneous Superconductor

The existence of space inhomogeneous superconductor insulator state (SISIS) found out earlier in polycrystalline samples of high- TC system Ba0.6K0.4BiO3 (TC≈30 K) is confirmed on Ba0.6K0.4BiO3 single crystal. At T* (T*<TC,T*≈17 K) the transition from the homogeneous superconducting state into the SISIS occurs. SISIS is characterized by the appearance of two gaps on the Fermi surface, semi- and superconducting, which are modulated in space in antiphase, the electric transport between superconducting regions being carried out due to Josephson tunneling. Thus the whole sample becomes a multiple Josephson system. Nonlinear I-V curves are observed on Ba0.6K0.4BiO3 single crystal at temperatures below T*. Dependence of I-V curves on temperature and magnetic field, typical to a Josephson system, was found out. Besides, a step-like peculiarity at the values of voltage of the order of one and two superconducting gaps shows up. These peculiarities are suppressed by magnetic field much earlier than critical current. The new data firstly correlate with the model of SISIS and secondly permit for the first time to determining directly the energy gap between homogeneous and stratified superconductor states.

Angular magnetoresistance oscillations and the shape of the Fermi surface in ?(ET)2IBr2

1992 ◽  
Vol 2 (1) ◽  
pp. 89-99 ◽  
Author(s):  
M. V. Kartsovnik ◽  
V. N. Laukhin ◽  
S. I. Pesotskii ◽  
I. F. Schegolev ◽  
V. M. Yakovenko
Keyword(s):  
Fermi Surface ◽  
Magnetoresistance Oscillations

Fermi-surface reconstruction close to a pressure-induced metal-insulator transition

2004 ◽  
Vol 114 ◽  
pp. 277-281 ◽  
Author(s):  
J. Wosnitza ◽  
J. Hagel ◽  
O. Stockert ◽  
C. Pfleiderer ◽  
J. A. Schlueter ◽  
...  
Keyword(s):  
Fermi Surface ◽  
Surface Reconstruction ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Fermi Surface Reconstruction

The fermi surface of lead

1962 ◽  
Author(s):  
James Robert Anderson
Keyword(s):  
Fermi Surface

scholarly journals Fermi surface of the skutterudite CoSb3 : Quantum oscillations and band-structure calculations

2021 ◽  
Vol 103 (8) ◽  
Author(s):  
M. Naumann ◽  
P. Mokhtari ◽  
Z. Medvecka ◽  
F. Arnold ◽  
M. Pillaca ◽  
...  
Keyword(s):  
Band Structure ◽  
Fermi Surface ◽  
Quantum Oscillations ◽  
Band Structure Calculations ◽  
Structure Calculations

scholarly journals Deformation of the Fermi surface of a spinless two-dimensional electron gas in presence of an anisotropic Coulomb interaction potential

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Orion Ciftja
Keyword(s):  
Fermi Surface ◽  
Coulomb Interaction ◽  
Interaction Potential ◽  
Fermi Liquid ◽  
Energy State ◽  
Electron Gas ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Two Dimensional Electron Gas ◽  
Dimensional Electron Gas

AbstractWe consider the stability of the circular Fermi surface of a two-dimensional electron gas system against an elliptical deformation induced by an anisotropic Coulomb interaction potential. We use the jellium approximation for the neutralizing background and treat the electrons as fully spin-polarized (spinless) particles with a constant isotropic (effective) mass. The anisotropic Coulomb interaction potential considered in this work is inspired from studies of two-dimensional electron gas systems in the quantum Hall regime. We use a Hartree–Fock procedure to obtain analytical results for two special Fermi liquid quantum electronic phases. The first one corresponds to a system with circular Fermi surface while the second one corresponds to a liquid anisotropic phase with a specific elliptical deformation of the Fermi surface that gives rise to the lowest possible potential energy of the system. The results obtained suggest that, for the most general situations, neither of these two Fermi liquid phases represent the lowest energy state of the system within the framework of the family of states considered in this work. The lowest energy phase is one with an optimal elliptical deformation whose specific value is determined by a complex interplay of many factors including the density of the system.

scholarly journals Fermi surface studies of the topologically nontrivial compound YSi

2021 ◽  
Vol 103 (19) ◽  
Author(s):  
Vikas Saini ◽  
Souvik Sasmal ◽  
Ruta Kulkarni ◽  
Bahadur Singh ◽  
A. Thamizhavel
Keyword(s):  
Fermi Surface ◽  
Surface Studies
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