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Evidence for a hybridization gap in noncentrosymmetric CeRuSi3

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Smidman, M., Adroja, D. T., Goremychkin, E. A., Lees, Martin R., Paul, Don McK. and Balakrishnan, Geetha (2015) Evidence for a hybridization gap in noncentrosymmetric CeRuSi3. Physical Review B (Condensed Matter and Materials Physics), 91 (6). 064419. doi:10.1103/PhysRevB.91.064419

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Official URL: http://dx.doi.org/10.1103/PhysRevB.91.064419

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Abstract

Inelastic neutron scattering (INS) and specific heat measurements have been performed on the intermediate valence compound CeRuSi3, which is isostructural to the noncentrosymmetric pressure-induced superconductors CeRhSi3, CeIrSi3, and CeCoGe3. INS measurements at 7 K reveal a broad peak at (58.5 ± 1.4) meV, while at 300 K, broad quasielastic scattering is observed. This indicates a large Kondo temperature of TK ~ 680 K. The magnetic contribution to the specific heat (Cmag) has a value of γ = 62.5(1) mJ/molK2 at low temperatures and above about 100 K can be well accounted for by the Coqblin-Schrieffer model with a characteristic temperature of T0 = 680 K, which is further evidence that CeRuSi3 is in the intermediate valence regime.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Neutrons--Inelastic scattering, Inelastic scattering, Neutrons--Scattering, Conduction electrons, Superconductors, Superconductors--Thermal properties, Superconductors--Magnetic properties
Journal or Publication Title: Physical Review B (Condensed Matter and Materials Physics)
Publisher: American Physical Society
ISSN: 1098-0121
Official Date: 19 February 2015
Dates:
DateEvent
19 February 2015Published
19 February 2015Accepted
Volume: 91
Number: 6
Article Number: 064419
DOI: 10.1103/PhysRevB.91.064419
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Copyright Holders: American Physical Society
Funder: Engineering and Physical Sciences Research Council (EPSRC), Science and Technology Facilities Council (Great Britain) (STFC), Advantage West Midlands (AWM), European Regional Development Fund (ERDF)
Grant number: EP/I007210/1 (EPSRC), CMPC-09108 (STFC)

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