Free Energy and Torque for Superconductors with Different Anisotropies of Hc2 and λ

V. G. Kogan

doi:10.1103/PhysRevLett.89.237005

← Back to search

Free Energy and Torque for Superconductors with Different Anisotropies of Hc2 and λ

V. G. Kogan

DOI 10.1103/PhysRevLett.89.237005 · Physical Review Letters

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

The free energy is evaluated for a uniaxial superconductor with the anisotropy of the upper critical field, γH=Hc2,a/Hc2,c, different from the anisotropy of the penetration depth γλ=λc/λa. With increasing difference between γH and γλ, the equilibrium orientation of the crystal relative to the applied field may shift from θ=π/2 (θ is the angle between the field and the c axis) to lower angles and reach θ=0 for large enough γH. These effects are expected to take place in MgB2.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown