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Field-Induced Quasiparticle Excitation in Ca(Al$ {0.5}$Si$ {0.5}$)$ 2$: Evidence for unconventional Superconductivity by Kuroiwa, S.; Takagiwa, H; Yamazawa, M.; Akimitsu, J.; Ohishi, K.; Koda, A.; Higemoto, W.; Kadono, R. is a scholarly article available to read on EtoBox.

What is Field-Induced Quasiparticle Excitation in Ca(Al$ {0.5}$Si$ {0.5}$)$ 2$: Evidence for unconventional Superconductivity about?

The temperature ($T$) and magnetic field ($H$) dependence of the magnetic penetration depth, $\lambda(T,H)$, in Ca(Al$_{0.5}$Si$_{0.5}$)$_2$ exhibits significant deviation from that expected for conventional BCS superconductors. In particular, it is inferred from a field dependence of $\lambda(H)$ ($\propto H$) at 2.0 K that the quasiparticle excitation is strongly enhanced by the Doppler shift. This suggests that the superconducting order parameter in Ca(Al$_{0.5}$Si$_{0.5}$)$_2$ is characterized by a small energy scale $\Delta_S/k_B\le 2$ K originating either from anisotropy or multi-gap structure.

Author

Kuroiwa, S.; Takagiwa, H; Yamazawa, M.; Akimitsu, J.; Ohishi, K.; Koda, A.; Higemoto, W.; Kadono, R.

Published

2004

Language

EN