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Title: Insensitivity of the pressure dependences of characteristic energy scales in Ce 1–xR xCoIn₅ (R=Yb,Y,Gd) to the electronic configuration of the rare-earth ion

Cooperative Ce and Yb valence fluctuations have recently been proposed as the mechanism responsible for stabilizing correlated electron phenomena in Ce₁₋ xYbxCoIn₅ over an unexpectedly large range of concentrations. In order to better understand the origins and character of this stability, we have measured the effect of applied pressure on relevant energy scales such as the superconducting critical (T c) and Kondo-lattice coherence (T*) temperatures of Ce₁₋ xR xCoIn₅ with R=Yb, Y, and Gd. Electrical resistivity measurements were performed under applied pressure on samples doped with intermediate-valent Yb and stable-valent Gd and Y, and the responses of Tc and T* to increased pressure in these systems are compared. The character of T c(P) and T*(P) in Ce₁₋ xR xCoIn₅ depends only on their respective ambient-pressure values T c(0) and T*(0), independent of the electronic configuration of R or concentration x. The consequences of this result are discussed within the context of possible cooperative valence fluctuations in Ce₁₋ xYb xCoIn₅.
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Publication Date:
Publisher's Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 86; Journal Issue: 10; Related Information: CHORUS Timestamp: 2017-04-06 11:40:02; Journal ID: ISSN 1098-0121
American Physical Society
Sponsoring Org:
Country of Publication:
United States
OSTI Identifier: