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19 April 2024

» arxiv » 1311.4050

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Verification of Anisotropic s-Wave Superconducting Gap Structure in CeRu2 from Low-Temperature Field-Angle-Resolved Specific Heat Measurements
Shunichiro Kittaka ; Toshiro Sakakibara ; Masato Hedo ; Yoshichika Onuki ; Kazushige Machida ;
Date:	16 Nov 2013
Abstract:	The field-angle-resolved specific heat C(T,H,phi) of the f-electron superconductor CeRu2 (Tc=6.3 K) has been measured at low temperatures down to 90 mK on two single crystals of slightly different qualities. We reveal that the C(phi) oscillation in a rotating magnetic field, originating from the gap anisotropy, diminishes at low temperatures below the characteristic field H, as expected for an anisotropic gap without nodes. We also observe the suppression of H by decreasing the gap anisotropy ratio $Delta_{ m min}/Delta_{ m max}$, a behavior that has been predicted from a microscopic theory for anisotropic s-wave superconductors. The present technique is established as a powerful tool for investigating minimum-gap structures as well as nodal structures.
Source:	arXiv, 1311.4050
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