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Article overview
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Interplay between effective mass anisotropy and Pauli paramagnetic effects in a multiband superconductor--Application to Sr2RuO4-- | | Noriyuki Nakai
; Kazushige Machida
; | | Date: |
27 Jul 2015 | | Abstract: | We investigate the mixed state properties in a type II multiband
superconductor with uniaxial anisotropy under the Pauli paramagnetic effects.
Eilenberger theory extended to a multiband superconductor is utilized to
describe the detailed vortex lattice properties, such as the flux line form
factors, the vortex lattice anisotropy and magnetic torques. We apply this
theory to Sr$_2$RuO$_4$ to analyze those physical quantities obtained
experimentally, focusing on the interplay between the strong two-dimensional
anisotropy and the Pauli paramagnetic effects. This study allows us to
understand the origin of the disparity between the vortex lattice anisotropy
($sim$60) and the $H_{
m c2}$ anisotropy ($sim$20). Among the three bands;
$gamma$ with the effective mass anisotropy $sim$180, $alpha$ with $sim$120,
and $eta$ with $sim$60, the last one is found to be the major band,
responsible for various magnetic responses while the minor $gamma$ band plays
an important role in the vortex formation. Namely, in a field orientation
slightly tilted away from the two dimensional basal plane those two bands
cooperatively form the optimal vortex anisotropy which exceeds that given by
the effective mass formula with infinite anisotropy. This is observed by small
angle neutron scattering experiments on Sr$_2$RuO$_4$. The pairing symmetry of
Sr$_2$RuO$_4$ realized is either spin singlet or spin triplet with the d-vector
strongly locked in the basal plane. The gap structure is that the major $eta$
band has a full gap and the minor $gamma$ band has a $d_{x^2-y^2}$ like gap. | | Source: | arXiv, 1507.7364 | | Services: | Forum | Review | PDF | Favorites | |
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