Electromagnetic Response of a k_xpm ik_y Superconductor Effect of Order Parameter Collect.pdfVIP

Electromagnetic Response of a kx ± iky Superconductor: Effect of Order Parameter Collective Modes S. Higashitani and K. Nagai Faculty of Integrated Arts and Sciences, Hiroshima University, Kagamiyama 1-7-1, Higashi-hiroshima 739-8521, Japan (February 1, 2008) 0 0 0 superconductors. Dynamical properties are, in particu- 2 Effects of order parameter collective modes on electromag- lar, intriguing because they depend not only on the equi- r netic response are studied for a clean spin-triplet supercon- librium gap structure but also on the collective excita- a ductor with kx ± iky orbital symmetry, which has been pro- tions of the order parameter.7,8 As is known in the study posed as a candidate pairing symmetry for Sr RuO . It is 2 4 of superfluid 3He, internal degrees of freedom of the or- M shown that the kx ± iky superconductor has characteristic der parameter give rise to the order parameter collective 4 massive collective modes analogous to the clapping mode in modes (OPCM’s) specific to a given pairing symmetry. 1 the A-phase of superfluid 3He. We discuss the contribution from the collective modes to ultrasound attenuation and elec- In this paper, we discuss, within the collisionless regime, ] tromagnetic absorption. We show that in the electromagnetic how the OPCM’s in the kx