Meissner effect and gauge invariance in anisotropic narrow-band Bloch-electron and hole-type superconductors

Susumu Misawa

doi:10.1103/PhysRevB.49.6305

← Back to search

Meissner effect and gauge invariance in anisotropic narrow-band Bloch-electron and hole-type superconductors

Susumu Misawa

DOI 10.1103/PhysRevB.49.6305 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

Within the framework of the ladder-diagram approximation, the manifestly gauge-invariant expression for the static electromagnetic response kernel of the anisotropic narrow-band superconductor consisting of Bloch electrons is derived, on the basis of the charge-conserving current expression for them under the magnetic field. For the two-dimensional square lattice, the magnetic penetration depth λL(T) is calculated as a function of hole density nh and temperature T (<Tc). The resultant λL(0) has a symmetrical dependence on the hole and electron densities, and is almost unaffected by the anisotropy of the order parameter. The behavior of λL(T)/λL(0) as a function of T/Tc for the d-wave state substantially deviates from those for the extended and usual s-wave states for all T<Tc. The obtained results are compared with those of the effective hole- and electron-mass approximations.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown