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Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 59: Correlated Electrons: Quantum-Critical Phenomena - Experiments

TT 59.5: Vortrag

Donnerstag, 14. März 2013, 16:00–16:15, H6

Pressure- and Composition-Induced Structural Quantum Phase Transition in the Cubic Superconductor (Sr,Ca)3Ir4Sn13 — •Swee K. Goh1, Lina E. Klintberg1, Patricia L. Alireza1, Paul Saines2, David Tompsett1, Peter Logg1, Jinhu Yang3,4, Bin Chen3,4, Kazuyoshi Yoshimura4, and Malte Grosche11Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom — 2Department of Materials Science and Metallurgy, University of Cambridge, United Kingdom — 3Department of Physics, Hangzhou Normal University, China — 4Department of Chemistry, Kyoto University, Japan

The quasi-skutterudite superconductor Sr3Ir4Sn13 has been reexamined recently. In addition to a superconducting transition at Tc = 5 K, pronounced anomalies can be seen in magnetic susceptibility and resistivity at T* = 147 K. Using single crystal x-ray diffraction, we identify T* = 147 K as the temperature where the system undergoes a structural transition from a simple cubic parent structure (I-phase) to a superlattice variant (I’-phase) with a lattice parameter twice that of the I-phase. Applying physical pressure or chemical pressure (via the isoelectronic substitution of Ca for Sr) leads to a rapid suppression of T* = 147 K and an enhancement of Tc. Furthermore, a quasi-linear temperature dependence of resistivity is observed at the pressure where T* = 147 K extrapolates to 0 K, reminiscent of quantum critical phenomena on the border of magnetism. We argue that the pressure phase diagram of Sr3Ir4Sn13 features a superlattice quantum critical point.

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