[Zurück]

Y. Yamada, T. Sakakibara, J. Custers, M. Hedo, Y. Önuki, P. Miranovic, K. Machida:
"Low Energy Excitations in the Mixed State of the Anisotropic s-Wave Superconductor CeRu₂";
Journal of the Physical Society of Japan, 76 (2007), 12; S. 123704-1 - 123704-4.

Low Energy Excitations in the Mixed State of the Anisotropic s-Wave Superconductor CeRu₂

Atsushi Yamada, Toshiro Sakakibara, Jeroen Custers, Masato Hedo, Yoshichika Ōnuki Predrag Miranović and Kazushige Machida

Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 270-8581
Institute of Solid State Physics, Vienna University of Technology, Vienna 1040, Austria
Department of Physics, University of the Ryukyus, Nishihara, Okinawa 903-0213
Department of Physics, Osaka University, Toyonaka, Osaka 560-0043
Department of Physics, University of Montenegro, Podgorica 81000, Montenegro
Department of Physics, Okayama University, Okayama 700-8530

(Received September 11, 2007; Accepted October 10, 2007; Published November 26, 2007)

Angle-resolved specific heat measurements are preformed on the f-electron superconductor CeRu₂ in rotating magnetic fields 0.5≤H≤6 T at various temperatures 0.3≤T≤2 K. In the whole H-T range examined, a clear 4-fold oscillation is observed and yields the gap minimum (maximum) located to <110> (<100>) in the cubic crystal with the ratio Δmin/Δmax∼0.3. The oscillation amplitude landscape in H-T plane with a local maximum is explained by a microscopic theory, pointing to a new spectroscopy for gap determination.

anisotropic s-wave superconductor, gap structure, Volovik effect, angle-resolved specific heat measurement

http://dx.doi.org/10.1143/JPSJ.76.123704

http://jpsj.ipap.jp/link?JPSJ/76/123704/