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

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

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

Author(s) -

Daniel E. Bugaris,

Christos D. Malliakas,

Fei Han,

Nicholas P. Calta,

Mihai Sturza,

Matthew Krogstad,

R. Osborn,

Stephan Rosenkranz,

Jacob P. C. Ruff,

Giancarlo Trimarchi,

Sergey L. Bud’ko,

Mahalingam Balasubramanian,

Duck Young Chung,

Mercouri G. Kanatzidis

Publication year - 2017

Publication title -

journal of the american chemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 7.115

H-Index - 612

eISSN - 1520-5126

pISSN - 0002-7863

DOI - 10.1021/jacs.7b00284

Subject(s) - chemistry , charge density wave , tetragonal crystal system , crystal structure , condensed matter physics , crystallography , magnetoresistance , electrical resistivity and conductivity , electronic structure , single crystal , charge density , density of states , superconductivity , magnetic field , computational chemistry , physics , engineering , quantum mechanics , electrical engineering

A new polymorph of the RE 2 Ru 3 Ge 5 (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 Sc 2 Fe 3 Si 5 -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 Sm 2 Ru 3 Ge 5 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 (T CDW ) 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.

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