scholarly journals Competition between Antiferromagnetic and Superconducting States, Electron-Hole Doping Asymmetry, and Fermi-Surface Topology in High Temperature Superconductors

2009 ◽  
Vol 102 (2) ◽  
Author(s):  
Sandeep Pathak ◽  
Vijay B. Shenoy ◽  
Mohit Randeria ◽  
Nandini Trivedi
Keyword(s):  
High Temperature ◽  
Fermi Surface ◽  
High Temperature Superconductors ◽  
Surface Topology ◽  
Hole Doping ◽  
Electron Hole ◽  
Fermi Surface Topology

scholarly journals JOSEPHSON (001) TILT GRAIN BOUNDARY JUNCTIONS OF HIGH-TEMPERATURE SUPERCONDUCTORS

2007 ◽  
Vol 21 (18n19) ◽  
pp. 3194-3198
Author(s):  
RICHARD A. KLEMM ◽  
GERALD B. ARNOLD
Keyword(s):  
High Temperature ◽  
Grain Boundary ◽  
Fermi Surface ◽  
Critical Current ◽  
High Temperatures ◽  
High Temperature Superconductors ◽  
Surface Topology ◽  
Phase Sensitive ◽  
Fermi Surface Topology ◽  
Tilt Grain Boundary

We calculate the Josephson critical current Ic across in-plane (001) tilt grain boundary junctions of high-temperature superconductors. We assume the Fermi surface has either an electron-doped form, or one of three hole-doped forms, and either random or specular tunneling across the junctions. We find that in-plane 'phase-sensitive' experiments are consistent with our results for the electron-doped superconductors. For the hole-doped superconductors, however, the results depend strongly upon the details of both the Fermi surface topology and the nature of the tunneling, and are therefore considerably less robust than has generally been believed. Hence, the tricrystal, tetracrystal, and interferometry experiments on hole-doped high-temperatures superconductors are unreliable, and should be redesigned.

scholarly journals Ultrafast dynamical Lifshitz transition

2021 ◽  
Vol 7 (17) ◽  
pp. eabd9275
Author(s):  
Samuel Beaulieu ◽  
Shuo Dong ◽  
Nicolas Tancogne-Dejean ◽  
Maciej Dendzik ◽  
Tommaso Pincelli ◽  
...  
Keyword(s):  
Fermi Surface ◽  
Colossal Magnetoresistance ◽  
Surface Topology ◽  
Strongly Correlated ◽  
Many Body ◽  
Time Resolved ◽  
Weyl Semimetal ◽  
Lifshitz Transition ◽  
Fermi Surface Topology ◽  
Many Body Systems

Fermi surface is at the heart of our understanding of metals and strongly correlated many-body systems. An abrupt change in the Fermi surface topology, also called Lifshitz transition, can lead to the emergence of fascinating phenomena like colossal magnetoresistance and superconductivity. While Lifshitz transitions have been demonstrated for a broad range of materials by equilibrium tuning of macroscopic parameters such as strain, doping, pressure, and temperature, a nonequilibrium dynamical route toward ultrafast modification of the Fermi surface topology has not been experimentally demonstrated. Combining time-resolved multidimensional photoemission spectroscopy with state-of-the-art TDDFT+U simulations, we introduce a scheme for driving an ultrafast Lifshitz transition in the correlated type-II Weyl semimetal Td-MoTe2. We demonstrate that this nonequilibrium topological electronic transition finds its microscopic origin in the dynamical modification of the effective electronic correlations. These results shed light on a previously unexplored ultrafast scheme for controlling the Fermi surface topology in correlated quantum materials.

Pressure-induced change of the Fermi surface topology in Al-based solid solutions

2003 ◽  
Vol 45 (12) ◽  
pp. 2213-2217 ◽  
Author(s):  
A. S. Mikhailushkin ◽  
É. I. Isaev ◽  
Yu. Kh. Vekilov ◽  
S. I. Simak
Keyword(s):  
Fermi Surface ◽  
Solid Solutions ◽  
Surface Topology ◽  
Fermi Surface Topology

scholarly journals Fermi surface topology and large magnetoresistance in the topological semimetal candidate PrBi

2019 ◽  
Vol 99 (24) ◽  
Author(s):  
Amit Vashist ◽  
R. K. Gopal ◽  
Divya Srivastava ◽  
M. Karppinen ◽  
Yogesh Singh
Keyword(s):  
Fermi Surface ◽  
Surface Topology ◽  
Topological Semimetal ◽  
Fermi Surface Topology

scholarly journals Transport signatures of Fermi surface topology change in BiTeI

2015 ◽  
Vol 91 (20) ◽  
Author(s):  
Linda Ye ◽  
Joseph G. Checkelsky ◽  
Fumitaka Kagawa ◽  
Yoshinori Tokura
Keyword(s):  
Fermi Surface ◽  
Surface Topology ◽  
Topology Change ◽  
Fermi Surface Topology

scholarly journals The influence of topological phase transition on the superfluid density of overdoped copper oxides

2017 ◽  
Vol 19 (33) ◽  
pp. 21964-21969 ◽  
Author(s):  
V. R. Shaginyan ◽  
V. A. Stephanovich ◽  
A. Z. Msezane ◽  
G. S. Japaridze ◽  
K. G. Popov
Keyword(s):  
Phase Transition ◽  
High Temperature Superconductors ◽  
Superfluid Density ◽  
Copper Oxides ◽  
Surface Topology ◽  
Topological Phase ◽  
Primary Reason ◽  
Flat Bands ◽  
Topological Phase Transition ◽  
Fermi Surface Topology

We show that a quantum phase transition, generating flat bands and altering Fermi surface topology, is a primary reason for the exotic behavior of the overdoped high-temperature superconductors represented by La2−xSrxCuO4, whose superconductivity features differ from what is predicted by the classical Bardeen–Cooper–Schrieffer theory.

scholarly journals Fermi-surface topology of the heavy-fermion system Ce2PtIn8

2018 ◽  
Vol 97 (16) ◽  
Author(s):  
J. Klotz ◽  
K. Götze ◽  
E. L. Green ◽  
A. Demuer ◽  
H. Shishido ◽  
...  
Keyword(s):  
Fermi Surface ◽  
Heavy Fermion ◽  
Surface Topology ◽  
Fermion System ◽  
Heavy Fermion System ◽  
Fermi Surface Topology

scholarly journals Energy Scale of the Charge Density Wave in Cuprate Superconductors

Proceedings ◽  
2019 ◽  
Vol 26 (1) ◽  
pp. 20
Author(s):  
Sacuto ◽  
Loret ◽  
Auvray ◽  
Civelli ◽  
Indranil ◽  
...  
Keyword(s):  
High Temperature ◽  
Charge Density ◽  
Charge Density Wave ◽  
Cuprate Superconductors ◽  
High Temperature Superconductors ◽  
Density Wave ◽  
Energy Scale ◽  
Hole Doping ◽  
Wide Range

The cuprate high temperature superconductors develop spontaneous charge density wave(CDW) order below a temperature TCDW and over a wide range of hole doping (p). [...]

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