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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity - Poster Session

TT 30.15: Poster

Montag, 31. März 2014, 15:00–19:00, P2

Fermi surface investigations on the filled skutterudite LaRu₄As₁₂ superconductor — •J. Klotz^1,2, K. Götze^1,2, V. Petzold³, H. Rosner³, T. Cichorek⁴, Z. Henkie⁴, and J. Wosnitza^1,2 — 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 (T_c=10.45 K and µ₀H_c2≈10.2 T). The magnetic-field dependence of the electronic specific-heat coefficient γ and the positive curvature of H_c2(T) close to T_c 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).