Temperature-dependent local structure and superconductivity of BaPd2As2 and SrPd2As2

K. Terashima, E. Paris, L. Simonelli, E. Salas-Colera, A. Puri, T. Wakita, Y. Yamada, S. Nakano, H. Idei, K. Kudo, M. Nohara, Y. Muraoka, T. Mizokawa, T. Yokoya, N. L. Saini

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Abstract

The local structures of 122-type paradium arsenides, namely BaPd2As2 and SrPd2As2, are examined by As K-edge extended x-ray absorption fine structure measurements to find a possible correlation between the variation of their superconducting transition temperature and the local structure. The local atomic distances are found to be consistent with average distances measured by diffraction techniques. The temperature dependence of mean square relative displacements reveal that, while BaPd2As2 is characterized by a local As-Pd soft mode, albeit with larger atomic disorder, SrPd2As2 shows anomalous As-Pd correlations with a kink at ∼160 K due to hardening by raising temperature. We have discussed implications of these results and possible mechanisms of differing superconducting transition temperature in relation with the structural instability.

Original languageEnglish
Article number094525
JournalPhysical Review B
Volume98
Issue number9
DOIs
Publication statusPublished - Sep 28 2018

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Terashima, K., Paris, E., Simonelli, L., Salas-Colera, E., Puri, A., Wakita, T., Yamada, Y., Nakano, S., Idei, H., Kudo, K., Nohara, M., Muraoka, Y., Mizokawa, T., Yokoya, T., & Saini, N. L. (2018). Temperature-dependent local structure and superconductivity of BaPd2As2 and SrPd2As2. Physical Review B, 98(9), [094525]. https://doi.org/10.1103/PhysRevB.98.094525