Anisotropy of upper critical field for high temperature superconductors

2003 ◽  
Vol 329-333 ◽  
pp. 1465-1466
Author(s):  
H MATSUEDA
Keyword(s):  
High Temperature ◽  
Critical Field ◽  
High Temperature Superconductors ◽  
Upper Critical Field

scholarly journals The Gap and the Upper Critical FieldHc2as Function of Doping for High-TcCuprates

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
S. Orozco ◽  
R. M. Méndez-Moreno ◽  
M. A. Ortiz
Keyword(s):  
High Temperature ◽  
Critical Field ◽  
Energy Gap ◽  
High Temperature Superconductors ◽  
Upper Critical Field ◽  
Superconducting Gap ◽  
Phonon Interaction ◽  
As Doping ◽  
Electron Phonon Interaction ◽  
Wave Symmetry

The relation between thed-wave superconducting gapΔ0and the specific heat obtained with the Volovik effect is used to determine the upper critical fieldHc2as doping function, for high-temperature superconductors. A two-components model withd-wave symmetry, within the BCS framework, is introduced to describe the superconducting state. Generalized Fermi surface topologies are used in order to increase the density of states at the Fermi level, allowing the high-Tcvalues observed. The electron-phonon interaction is considered the most relevant mechanism for the high-Tccuprates, where the available phonon energy is provided by the half-breathing modes. The energy gap valuesΔ0calculated with this model are introduced to describe the variation of the upper critical fieldHc2as function of doping, forLa2-xSrxCuO4.

POSITIVE CURVATURE IN PERPENDICULAR CRITICAL FIELD OF HIGH-TEMPERATURE SUPERCONDUCTORS

1990 ◽  
Vol 04 (07) ◽  
pp. 471-477 ◽  
Author(s):  
MARKO LEDVIJ ◽  
LJILJANA DOBROSAVLJEVIĆ-GRUJIĆ
Keyword(s):  
High Temperature ◽  
Single Crystals ◽  
Critical Field ◽  
Proximity Effect ◽  
Positive Curvature ◽  
High Temperature Superconductors ◽  
Upper Critical Field ◽  
Superconducting Phases ◽  
Linear Behavior ◽  
Effect Theory

The behavior of the perpendicular upper critical field in high T c superconductors is studied theoretically. It is shown, within proximity effect theory, that a substantial deviation from intrinsically linear behavior of [Formula: see text] near T c can occur when imperfections exist in single crystals. A positive curvature arises if there is a competition of superconductivity of two different superconducting phases — the bulk and the defect — in the specimen.

scholarly journals Enhancement of the upper critical field in codoped iron-arsenic high-temperature superconductors

2011 ◽  
Vol 110 (12) ◽  
pp. 123906 ◽  
Author(s):  
F. Weickert ◽  
M. Nicklas ◽  
W. Schnelle ◽  
J. Wosnitza ◽  
A. Leithe-Jasper ◽  
...  
Keyword(s):  
High Temperature ◽  
Critical Field ◽  
High Temperature Superconductors ◽  
Upper Critical Field

scholarly journals The upper critical field of high temperature superconductors

1988 ◽  
Vol 76-77 ◽  
pp. 547-551 ◽  
Author(s):  
G.W. Crabtree ◽  
W.K. Kwok ◽  
U. Welp ◽  
R. Burriel ◽  
H. Claus ◽  
...  
Keyword(s):  
High Temperature ◽  
Critical Field ◽  
High Temperature Superconductors ◽  
Upper Critical Field

Vortex Lattice Structure of High Temperature Superconductors

2003 ◽  
Vol 17 (18n20) ◽  
pp. 3415-3422
Author(s):  
Shi-Ping Zhou ◽  
Hao-Chen Du ◽  
Hong-Yin Liao
Keyword(s):  
High Temperature ◽  
Transition Temperature ◽  
Critical Field ◽  
Vortex Lattice ◽  
Lattice Structure ◽  
High Temperature Superconductors ◽  
Upper Critical Field ◽  
Ginzburg Landau ◽  
Landau Model ◽  
Upward Curvature

We study vortex lattice structure of high temperature superconductors by using the Ginzburg–Landau model. The structure of the vortex lattice is oblique at the temperatures well below the transition temperature Tc, where the mixed s–d state is expected to have the lowest energy. Whereas, very close to Tc, the dx2-y2 wave is slightly lower in energy, and a triangular vortex lattice recovers. The coexistence and the coupling between the s- and d-waves account for the upward curvature of the upper critical field curve HC2(T).

scholarly journals Pauli-limit upper critical field of high-temperature superconductor La1.84Sr0.16CuO4

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Daisuke Nakamura ◽  
Tadashi Adachi ◽  
Keisuke Omori ◽  
Yoji Koike ◽  
Shojiro Takeyama
Keyword(s):  
High Temperature ◽  
Critical Field ◽  
High Temperature Superconductor ◽  
Upper Critical Field ◽  
Small Contribution ◽  
Spin Orbit Coupling ◽  
Temperature Dependent ◽  
First Order ◽  
First Order Phase Transition ◽  
First Order Phase

AbstractThe upper critical field of a cuprate high-temperature superconductor, La1.84Sr0.16CuO4, was investigated by high-frequency self-resonant contactless electrical conductivity measurements in magnetic fields up to 102 T. An irreversible transition was observed at 85 T (T = 4.2 K), defined as the upper critical field. The temperature-dependent upper critical field was argued on the basis of the Werthamer-Helfand-Hohenberg theory. The Pauli-limiting pair-breaking process with a small contribution of the spin-orbit coupling explained the first-order phase transition exhibiting a hysteresis observed at low temperatures.

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