Dresden 2009 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 14: Superconductivity: Non-Cuprate Non-Ferropnictide Superconductors

TT 14.3: Talk

Tuesday, March 24, 2009, 10:00–10:15, HSZ 105

Electronic structure of SrPt₄Ge₁2 : a study by soft x-ray photoelectron spectroscopy and band structure calculations — •Jan Gegner¹, David Regesch¹, Helge Rosner², Walter Schnelle², Roman Gumeniuk², Andreas Leithe-Jasper², Hidenori Fujiwara¹, Tim Haupricht¹, H. -H. Hsieh³, H. -J. Lin⁴, C. T. Chen⁴, Alim Ormeci², Juri Grin², and Liu Hao Tjeng¹ — ¹II. Physikalisches Institut, Universität zu Köln, Germany — ²Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden, Germany — ³Chung Cheng Institute of Technology, National Defense University,Taoyuan, Taiwan — ⁴National Synchrotron Radiation Research Center (NSRRC), Hsinchu, Taiwan

We present a comparative study of the electronic structure of the superconducting skutterudite SrPt₄Ge₁₂ by means of soft x-ray photoelectron spectroscopy and full potential band structure calculations. Excellent agreement between the measured and the calculated valence spectra is observed, confirming the picture of rather localized, low lying Pt 5d states compared to Pt metal. This implicates that the states at the Fermi level stem predominantly from Ge 4p electrons. An analysis of the chemical bonding in SrPt₄Ge₁₂ based on the electron localizability indicator is given.