Field-induced quasiparticle excitations in novel type II superconductors

Details Field-induced quasiparticle excitations in novel type II superconductors Field-induced quasiparticle excitations in novel type II superconductors

2004-03-16

arxiv.org/abs/cond-mat/0403376v1

J. Phys.: Condens. Matter, 16, S4421-S4438 (2004)

Physics

Condensed Matter

Superconductivity

24 pages, 9 figures, submitted to J. Phys.: Cond. Matt. (muSR Special Issue)

Scientific paper

10.1088/0953-8984/16/40/002

We show that the field dependence of the magnetic penetration depth ($\lambda$), for which muon spin rotation ($\mu$SR) is an excellent microscopic probe, provides useful information on the degree of anisotropy for the superconducting order parameter. In type II superconductors associated with anisotropic order parameters, $\lambda$ is sensitive to the quasiparticle excitation induced by the Doppler shift due to a supercurrent around magnetic vortices. The presence of such low-energy excitations manifests itself in the non-zero slope of $\lambda$ against an external magnetic field. We review recent results on the field dependence of $\lambda$ obtained from the application of $\mu$SR to novel superconductors that exhibit unconventional characters associated with the anisotropic order parameter.

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