Resolution of the discrepancy between the variation of the physical properties of Ce1-xYbxCoIn5 single crystals and thin films with Yb composition

Jang, S.; White, B. D.; Lum, I. K.; Kim, H.; Tanatar, M. A.; Straszheim, W. E.; Prozorov, R.; Keiber, T.; Bridges, F.; Shu, L.; Baumbach, R. E.; Janoschek, M.; Maple, M. B.

doi:10.1080/14786435.2014.976287

Title: Resolution of the discrepancy between the variation of the physical properties of Ce_1-xYb_xCoIn₅ single crystals and thin films with Yb composition

Journal Article · Tue Nov 18 00:00:00 EST 2014 · Philosophical Magazine (2003, Print)

DOI:https://doi.org/10.1080/14786435.2014.976287· OSTI ID:1225533

Jang, S. ^[1]; White, B. D. ^[1]; Lum, I. K. ^[1]; Kim, H. ^[2]; Tanatar, M. A. ^[2]; Straszheim, W. E. ^[3]; Prozorov, R. ^[2]; Keiber, T. ^[4]; Bridges, F. ^[4]; Shu, L. ^[5]; Baumbach, R. E. ^[6]; Janoschek, M. ^[7]; Maple, M. B. ^[1]

Univ. of California, San Diego, La Jolla, CA (United States)
Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
Ames Lab., Ames, IA (United States)
Univ. of California, Santa Cruz, CA (United States)
Fudan Univ., Shanghai (China)
Florida State Univ., Tallahassee, FL (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

The extraordinary electronic phenomena including an Yb valence transition, a change in Fermi surface topology, and suppression of the heavy fermion quantum critical field at a nominal concentration x≈0.2 have been found in the Ce_1-xYb_xCoIn₅ system. These phenomena have no discernable effect on the unconventional superconductivity and normal-state non-Fermi liquid behaviour that occur over a broad range of x up to ~0.8. However, the variation of the coherence temperature T* and the superconducting critical temperature T_c with nominal Yb concentration x for bulk single crystals is much weaker than that of thin films. To determine whether differences in the actual Yb concentration of bulk single crystals and thin film samples might be responsible for these discrepancies, we employed Vegard’s law and the spectroscopically determined values of the valences of Ce and Yb as a function of x to determine the actual composition x_act of bulk single crystals. This analysis is supported by energy-dispersive X-ray spectroscopy, wavelength-dispersive X-ray spectroscopy, and transmission X-ray absorption edge spectroscopy measurements. The actual composition x_act is found to be about one-third of the nominal concentration x up to x~0.5, and resolves the discrepancy between the variation of the physical properties of Ce_1-xYb_xCoIn₅ single crystals and thin films with Yb concentration.

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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1225533

Report Number(s):: IS-J-8546

Journal Information:: Philosophical Magazine (2003, Print), Vol. 94, Issue 36; ISSN 1478-6435

Publisher:: Taylor & FrancisCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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Cited By (2)

Robust upward dispersion of the neutron spin resonance in the heavy fermion superconductor Ce1−xYbxCoIn5 Song, Yu; Van Dyke, John; Lum, I. K. Nature Communications, Vol. 7, Issue 1 https://doi.org/10.1038/ncomms12774	journal	September 2016
Robust Upward Dispersion of the Neutron Spin Resonance in the Heavy Fermion Superconductor Ce$_{1-x}$Yb$_{x}$CoIn$_5$ Song, Yu; Van Dyke, John; Lum, I. K. arXiv https://doi.org/10.48550/arxiv.1607.05326	text	January 2016

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Title: Resolution of the discrepancy between the variation of the physical properties of Ce1-xYbxCoIn5 single crystals and thin films with Yb composition

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Title: Resolution of the discrepancy between the variation of the physical properties of Ce_1-xYb_xCoIn₅ single crystals and thin films with Yb composition