Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 30: Superconductivity - Poster Session
TT 30.15: Poster
Monday, March 31, 2014, 15:00–19:00, P2
Fermi surface investigations on the filled skutterudite LaRu4As12 superconductor — •J. Klotz1,2, K. Götze1,2, V. Petzold3, H. Rosner3, T. Cichorek4, Z. Henkie4, and J. Wosnitza1,2 — 1Hochfeld-Magnetlabor (HLD), Helmholtz-Zentrum Dresden-Rossendorf — 2Institut für Festkörperphysik, TU Dresden — 3Max-Planck-Institut CPfS, Dresden — 4INTiBS PAN, Wroclaw
Filled skutterudite compounds RT4Pn12 (R: rare-earth element, T=Fe, Ru, Os, Pn=P, As, Sb) exhibit a large variety of phenomena such as exceptionally high thermoelectric power, heavy-fermion superconductivity or metal-insulator transition [1]. Within this class, LaRu4As12 features outstanding superconducting properties (Tc=10.45 K and µ0Hc2≈10.2 T). The magnetic-field dependence of the electronic specific-heat coefficient γ and the positive curvature of Hc2(T) close to Tc indicate the existence of multiple superconducting gaps, making LaRu4As12 a rare example of a cubic superconductor displaying multiband effects [2]. Employing a capacitive torque magnetometer at temperatures down to 20 mK and in fields up to 35 T, we probed the angular dependence of the de Haas-van Alphen effect. We determined effective masses of different bands expecting enhanced masses due to the rather large γ = 59 mJ/mol K2. In combination with density-functional band-structure calculations, our results provide detailed information about the Fermi surface of LaRu4As12.
[1] M. B. Maple, E. D. Bauer, et al., Physica B, 328, 29-33 (2003).
[2] L. Bochenek, R. Wawryk, et al., Phys. Rev B. 86, 060511(R) (2012).