Anisotropic properties of MgB2 by torque magnetometry
arXiv:cond-mat/0304400 · doi:10.1016/j.physc.2004.02.045
Abstract
Anisotropic properties of superconducting MgB2 obtained by torque magnetometry are compared to theoretical predictions, concentrating on two issues. Firstly, the angular dependence of Hc2 is shown to deviate close to Tc from the dependence assumed by anisotropic Ginzburg-Landau theory. Secondly, from the evaluation of torque vs angle curves it is concluded that the anisotropy of the penetration depth gamma_lambda has to be substantially higher at low temperature than theoretical estimates, at least in fields higher than 0.2 T.
2 p.,2 Fig., submitted to Physica C (M2S-Rio proceedings); v2: 1 ref added
References in corpus (11)
- Enhancement of the upper critical field by nonmagnetic impurities in dirty two-gap superconductors
- Temperature and field dependence of the anisotropy of MgB2
- Specific heat of single crystal MgB_2: a two-band superconductor with two different anisotropies
- Multiband model for penetration depth in MgB2
- Upper critical field in dirty two-band superconductors: breakdown of the anisotropic Ginzburg-Landau theory
- Macroscopic anisotropy in superconductors with anisotropic gaps
- Anisotropy of the upper critical field in superconductors with anisotropic gaps. Anisotropy parameters of MgB2
- MgB2 single crystals: high pressure growth and anisotropic properties
- Unusual effects of anisotropy on the specific heat of ceramic and single crystal MgB2
- Free energy and torque for superconductors with different anisotropies of H_{c2} and lambda
- Anisotropy of the superconducting state properties and phase diagram of MgB2 by torque magnetometry on single crystals