Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 3: Superconductivity: Properties and Electronic Structure I

TT 3.5: Vortrag

Montag, 12. März 2018, 10:30–10:45, H 0110

Unconventional superconductivity in Mo₈Ga₄₁ — •Valeriy Verchenko¹, Rustem Khasanov², Zurab Guguchia², Alexander Tsirlin³, Miroslav Marcin⁴, and Andrei Shevelkov¹ — ¹Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia — ²Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen PSI, Switzerland — ³Experimental Physics VI, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, Augsburg, Germany — ⁴Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovakia

Among intermetallics, gallium cluster phases - the compounds, which crystal structures are built by gallium-based polyhedra with high coordination numbers - are promising candidates for unconventional superconductivity. In this class of compounds, ReGa₅, Mo₈Ga₄₁, Mo₆Ga₃₁, Rh₂Ga₉ and Ir₂Ga₉ are known to superconduct at low temperatures. Among the series, Mo₈Ga₄₁ exhibits the largest superconducting transition temperature of T_C=9.7 K in zero magnetic field. In our study, we focused on Mo₈Ga₄₁, aiming at the investigation of its macro- and microscopic properties. For this purpose, thermodynamic measurements as well as muon spin spectroscopy technique were employed. According to the specific heat measurements and transverse-field muon spin rotation/relaxation experiments, we classify Mo₈Ga₄₁ as a strong-coupled superconductor with two s-wave superconducting gaps.