Magnetic Field Dependence of the Superconducting Energy Gap in Ginzburg-Landau Theory with Application to Al

1962 ◽  
Vol 6 (1) ◽  
pp. 44-48 ◽  
Author(s):  
D. H. Douglass
Keyword(s):  
Magnetic Field ◽  
Field Dependence ◽  
Magnetic Field Dependence ◽  
Energy Gap ◽  
Landau Theory ◽  
Ginzburg Landau ◽  
Superconducting Energy Gap

Oscillatory non-resonant interband Faraday rotation in InSb and PbTe—a new magneto-optical effect

1971 ◽  
Vol 321 (1546) ◽  
pp. 303-320 ◽  
Keyword(s):  
Magnetic Field ◽  
Conduction Band ◽  
Field Dependence ◽  
Faraday Rotation ◽  
Magnetic Field Dependence ◽  
Energy Gap ◽  
Landau Levels ◽  
Wide Range ◽  
Magneto Optical Effect ◽  
The Magnetic Field

Oscillations in the magnetic field dependence of interband Faraday rotation in degenerate samples of InSb and PbTe at low temperatures have been observed for photons having a wide range of energies which are less than that corresponding to the forbidden energy gap. These oscillations are attributed to the imbalance of contributions from right and left circularly polarized modes to the total rotation, caused by the blocking of certain interband absorptions by conduction-band electrons. The perturbing effect of the variation of carrier concentration is used as an experimental variable. The relative strengths of the oscillations have been reasonably well accounted for by analysis of the interband selection rules and transition strengths given by a theory due to Boswarva & Lidiard. The positions of the oscillations, which depend on the population of Landau levels in the conduction band, have a reciprocal magnetic field dependence as for the de Haas-van Alphen effect, and have yielded quantitative determinations of energy-band parameters.

Magnetic Field Dependence of Energy Gap in Superconductors

1961 ◽  
Vol 121 (1) ◽  
pp. 107-117 ◽  
Author(s):  
K. K. Gupta ◽  
V. S. Mathur
Keyword(s):  
Magnetic Field ◽  
Field Dependence ◽  
Magnetic Field Dependence ◽  
Energy Gap

MAGNETIC FIELD DEPENDENCE OF ENTROPY AND SPECIFIC HEAT OF YBa2Cu3O7-δ SUPERCONDUCTORS

2012 ◽  
Vol 26 (02) ◽  
pp. 1250051 ◽  
Author(s):  
B. KALTA ◽  
P. NAYAK ◽  
K. K. NANDA
Keyword(s):  
Magnetic Field ◽  
Specific Heat ◽  
Magnetic Field Dependence ◽  
Landau Theory ◽  
Thermodynamic Quantities ◽  
Type Ii ◽  
Large Reduction ◽  
Superconducting Transition ◽  
Ginzburg Landau ◽  
Type Ii Superconductors

The change in thermodynamic quantities (e.g., entropy, specific heat etc.) by the application of magnetic field in the case of the high-Tc superconductor YBCO system is examined phenomenological by the Ginzburg–Landau theory of anisotropic type-II superconductors. An expression for the change in the entropy (ΔS) and change in specific heat (ΔC) in a magnetic field for any general orientation of an applied magnetic field Ba with respect to the crystallographic c-axis is obtained. The observed large reduction of specific heat anomaly just below the superconducting transition and the observed variation of entropy with magnetic field are explained quantitatively.

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