arXiv subjects

H. Won

Publications and source records attributed to H. Won.

21 records · Page 2Linked to original sources

arXiv2000

Possible f-wave superconductivity in Sr$_2$RuO$_4$?

Until recently it has been believed that the superconductivity in Sr$_2$RuO$_4$ is described by p-wave pairing. However, both the recent specific heat and the magnetic penetration depth measurements on the purest single crystals of Sr$_2$RuO$_4$ appear to be explained more consistently in terms of f-wave superconductivity. In order to further this hypothesis, we study theoretically the thermodynamics and thermal conductivity of f-wave superconductors in a planar magnetic field. We find the simple expressions for these quantities when $H \ll H_{c2} $ and $T \ll T_{c}$, which should be readily accessible experimentally.

cond-mat.supr-con↗

arXiv2000

Quasiparticle spectrum in the vortex state of d-wave superconductors

Quasiparticle spectrum associated with the nodal structure in d-wave superconductors is of great interest. We study theoretically the quasi-particle spectrum in a planar magnetic field, where the effect of the magnetic field is treated in terms of the Doppler shift. We obtain the angular dependent specific heat in the presence of a planar magnetic field and impurities, both in the superclean limit (Gamma/Delta << H/H_{c2}<< 1) and in the clean limit (H/H_{c2} << Gamma/Delta <<1). Also a similar analysis is used for the thermal conductivity tensor within the a-b plane. In particular, in contrast to the earlier works, we find a fourfold symmetry term in κ_{\parallel} and κ_{\perp} \sim -H \sin(2θ) where kappa_{perp} are the diagonal- and the off-diagonal components of the thermal conductivity tensor and θis the angle between the heat current and the magnetic field.

cond-mat.supr-con↗

arXiv1999

Paramagnetic state in d-wave Superconductors

We study theoretically the paramagnetic state in d-wave superconductors. We present the specific heat, the magnetization, superfluid density obtained within the weak-coupling model. At low temperatures and for small magnetic fields they exhibit simple power law behaviors, which should be accessible experimentally in hole-doped high-T_c cuprates and κ-(ET)_2 salts in a magnetic field within the conducting plane.

cond-mat.supr-con↗