1202.3282 (Lina E. Klintberg et al.)

Superlattice Quantum Critical Point in the Cubic Metal
(Sr/Ca)_3Ir_4Sn_{13}    [PDF]

Lina E. Klintberg, Swee K. Goh, Patricia L. Alireza, Paul J. Saines, David A. Tompsett, Peter W. Logg, Jinhu Yang, Bin Chen, Kazuyoshi Yoshimura, F. Malte Grosche

Using single crystal x-ray diffraction we show that the quasi-skutterudite
system (Sr/Ca)_3Ir_4Sn_{13} undergoes a temperature driven structural
transition at T* from a simple cubic phase, the I-phase, to the superlattice
variant, the I'-phase, which has a lattice parameter twice that of the high
temperature phase. We demonstrate that the superlattice transition temperature
T* can be suppressed to zero by both chemical and physical pressure, enabling
the first comprehensive investigation of a superlattice quantum critical point
and its interplay with superconductivity in a three-dimensional charge density
wave system.

View original: http://arxiv.org/abs/1202.3282