Charge Density Wave in the New Polymorphs of RE2Ru3Ge5 (RE = Pr, Sm, Dy)

Daniel E. Bugaris, Christos D. Malliakas, Fei Han, Nicholas P. Calta, Mihai Sturza, Matthew J. Krogstad, Raymond Osborn, Stephan Rosenkranz, Jacob P C Ruff, Giancarlo Trimarchi, Sergey L. Bud’ko, Mahalingam Balasubramanian, Duck Young Chung, Mercouri G Kanatzidis

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7 Citations (Scopus)

Abstract

A new polymorph of the RE2Ru3Ge5 (RE = Pr, Sm, Dy) compounds has been grown as single crystals via an indium flux. These compounds crystallize in tetragonal space group P4/mnc with the Sc2Fe3Si5-type structure, having lattice parameters a = 11.020(2) Å and c = 5.853(1) Å for RE = Pr, a = 10.982(2) Å and c = 5.777(1) Å for RE = Sm, and a = 10.927(2) Å and c = 5.697(1) Å for RE = Dy. These materials exhibit a structural transition at low temperature, which is attributed to an apparent charge density wave (CDW). Both the high-temperature average crystal structure and the low-temperature incommensurately modulated crystal structure (for Sm2Ru3Ge5 as a representative) have been solved. The charge density wave order is manifested by periodic distortions of the one-dimensional zigzag Ge chains. From X-ray diffraction, charge transport (electrical resistivity, Hall effect, magnetoresistance), magnetic measurements, and heat capacity, the ordering temperatures (TCDW) observed in the Pr and Sm analogues are ∼200 and ∼175 K, respectively. The charge transport measurement results indicate an electronic state transition happening simultaneously with the CDW transition. X-ray absorption near-edge spectroscopy (XANES) and electronic band structure results are also reported.

Original languageEnglish
Pages (from-to)4130-4143
Number of pages14
JournalJournal of the American Chemical Society
Volume139
Issue number11
DOIs
Publication statusPublished - Mar 22 2017

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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    Bugaris, D. E., Malliakas, C. D., Han, F., Calta, N. P., Sturza, M., Krogstad, M. J., Osborn, R., Rosenkranz, S., Ruff, J. P. C., Trimarchi, G., Bud’ko, S. L., Balasubramanian, M., Chung, D. Y., & Kanatzidis, M. G. (2017). Charge Density Wave in the New Polymorphs of RE2Ru3Ge5 (RE = Pr, Sm, Dy). Journal of the American Chemical Society, 139(11), 4130-4143. https://doi.org/10.1021/jacs.7b00284