Enhancement of the Superconducting Transition Temperature with   Hydrostatic Pressure in Ca_{3}Ir_{4}Sn_{13} Single Crystals
  We report high pressure magnetic susceptibility and electrical resistivity measurements on Ca_{3}Ir_{4}Sn_{13} single crystals up to 60 kbar. These measurements allow us to follow the evolution of the superconducting critical temperature T_c, the resistivity anomaly temperature T*, the superconducting coherence length and the Fermi velocity under pressure. The pressure-temperature phase diagram constructed for Ca_{3}Ir_{4}Sn_{13} shows a dome-shaped pressure dependence of T_c. The initial rise in T_c, which is accompanied by a decrease in T*, is consistent with a reduction in the partial gapping of the Fermi surface under pressure. 
Swee K. Goh, Lina E. Klintberg, Patricia L. Alireza, David A.   Tompsett, Jinhu Yang, Bin Chen, Kazuyoshi Yoshimura, F. Malt...
cond-mat.supr-con cond-mat.str-el