Spectroscopic Evidence for Strong Quantum Spin Fluctuations with Itinerant Character in YFe2Ge2

Sirica, N.; Bondino, F.; Nappini, S.; Piz, I.; Poudel, L.; Christianson, Andrew D.; Mandrus, D.; Singh, David J; Mannella, Norman

doi:10.1103/PhysRevB.91.121102

Title: Spectroscopic Evidence for Strong Quantum Spin Fluctuations with Itinerant Character in YFe₂Ge₂

Journal Article · Wed Mar 04 00:00:00 EST 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.91.121102· OSTI ID:1295093

Sirica, N. ^[1]; Bondino, F. ^[2]; Nappini, S. ^[2]; Piz, I. ^[3]; Poudel, L. ^[4]; Christianson, Andrew D. ^[4]; Mandrus, D. ^[5]; Singh, David J ^[6]; Mannella, Norman ^[1]

Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
Italian National Research Council (CNR), Basovizza (Italy). Istit. Officina dei Materiali
Italian National Research Council (CNR), Basovizza (Italy). Istit. Officina dei Materiali; Elettra Sincrotrone Trieste, Basovizza (Italy)
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division

We report x-ray absorption and photoemission spectroscopy of the electronic structure in the normal state of metallic YFe₂Ge₂. The data reveal evidence for large fluctuating spin moments on the Fe sites, as indicated by exchange multiplets appearing in the Fe 3s core-level photoemission spectra, even though the compound does not show magnetic order. The magnitude of the multiplet splitting is comparable to that observed in the normal state of the Fe-pnictide superconductors. This shows a connection between YFe₂Ge₂ and the Fe-based superconductors even though it contains neither pnictogens nor chalcogens. Finally, the implication is that the chemical range of compounds showing at least one of the characteristic magnetic signatures of the Fe-based superconductors is broader than previously thought.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; DMR-1151687

OSTI ID:: 1295093

Alternate ID(s):: OSTI ID: 1179902

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 91, Issue 12; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 21 works

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Composition dependence of bulk superconductivity in YFe2Ge2 Chen, Jiasheng; Gamża, Mb; Semeniuk, K. Apollo - University of Cambridge Repository https://doi.org/10.17863/cam.41385	text	January 2019
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Title: Spectroscopic Evidence for Strong Quantum Spin Fluctuations with Itinerant Character in YFe₂Ge₂