Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 6: Superconductivity: Properties and Electronic Structure

TT 6.6: Vortrag

Montag, 7. März 2016, 11:30–11:45, H19

Electronic structure determination of R₃T₄Sn₁₃ — •Xiaoye Chen¹, HongEn Tan¹, Lina E. Klintberg¹, Swee K. Goh^1,2, Sven Friedemann^1,3, Jinhu Yang^4,5, Bin Chen^4,5, Kazuyoshi Yoshimura⁵, David A. Tompsett¹, Wing Chi Yu², F. Malte Grosche¹, and Michael Sutherland¹ — ¹University of Cambridge, Cavendish Laboratory, Cambridge, UK — ²The Chinese University of Hong Kong, Department of Physics, Hong Kong, China — ³University of Bristol, HH Wills Physics Laboratory, Bristol, UK — ⁴Hangzhou Normal University, Department of Physics, Hangzhou, China — ⁵Kyoto University, Department of Chemistry, Kyoto, Japan

The quasi-skutterudite superconducting material family R₃T₄Sn₁₃ (R = Ca, Sr, T = Ir, Rh) was recently shown to have a composition and pressure induced structural quantum phase transition. The end member material Sr₃Ir₄Sn₁₃ at ambient pressure and above T* = 147 K adopts a simple cubic structure (I phase, Pm-3n). Below this temperature, the compound enters the I* phase, thought to result from a superlattice distortion of the I phase with twice the original lattice constant. We compare our quantum oscillation data for Sr₃Ir₄Sn₁₃, measured at a wide range of angles, with DFT calculations for the I and I* phases, as well as other proposed possibilities such as merohedral twining domains. We complement this comparison with thermal conductivity measurements of other materials in the family to provide important insights into the nature of the superlattice distortion.