Electronic and atomic structures of the Sr 3 Ir 4 Sn 13 single crystal: A possible charge density wave material

X-ray scattering (XRS), x-ray absorption near-edge structure (XANES) and extended x-ray absorption fine structure (EXAFS) spectroscopic techniques were used to study the electronic and atomic structures of the high-quality Sr 3 Ir 4 Sn 13 (SIS) single crystal below and above the transition temperature (T * ≈ 147 K). The evolution of a series of modulated satellite peaks below the transition temperature in the XRS experiment indicated the formation of a possible charge density wave (CDW) in the (110) plane. The EXAFS phase derivative analysis supports the CDW-like formation by revealing different bond distances [Sn 1(2) -Sn 2 ] below and above T * in the (110) plane. XANES spectra at the Ir L 3 -edge and Sn K -edge demonstrated an increase (decrease) in the unoccupied (occupied) density of Ir 5 d -derived states and a nearly constant density of Sn 5 p -derived states at temperatures T < T * in the (110) plane. These observations clearly suggest that the Ir 5 d -derived states are closely related to the anomalous resistivity transition. Accordingly, a close relationship exists between local electronic and atomic structures and the CDW-like phase in the SIS single crystal.