Tuning the Kondo effect in Yb(Fe1-xCox)2Zn20

Kong, Tai; Taufour, Valentin; Bud'ko, Sergey L.; Canfield, Paul C.

doi:10.1103/PhysRevB.95.155103

Title: Tuning the Kondo effect in Yb(Fe_1-xCo_x)₂Zn₂₀

Journal Article · Mon Apr 03 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.95.155103· OSTI ID:1368054

Kong, Tai ^[1]; Taufour, Valentin ^[1]; Bud'ko, Sergey L. ^[1]; Canfield, Paul C. ^[1]

Ames Lab., Ames, IA (United States)

We study the evolution of the Kondo effect in heavy fermion compounds, Yb(Fe_1-xCo_x)₂Zn₂₀ (0 ≲ x ≲ 1), by means of temperature-dependent electric resistivity and speci c heat. The ground state of YbFe₂Zn₂₀ can be well described by a Kondo model with degeneracy N = 8 and a T_K ~30 K. In the presence of a very similar total CEF splitting with YbFe₂Zn₂₀, the ground state of YbCo₂Zn₂₀ is close to a Kondo state with degeneracy N = 2 and a much lower TK ~ 2 K. Upon Co substitution, the coherence temperature of YbFe₂Zn₂₀ is suppressed, accompanied by an emerging Schottky-like feature in speci c heat associated with the thermal depopulation of CEF levels upon cooling. For 0.4 ≲ x ≲ 0.9, the ground state remains roughly the same which can be qualitatively understood by Kondo effect in the presence of CEF splitting. There is no clear indication of Kondo coherence observable in resistivity within this substitution range down to 500 mK. The coherence re-appears at around x≳ 0.9 and the coherence temperature increases with higher Co concentration levels.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: DE-AC02-07CH11358; AC02-07CH11358

OSTI ID:: 1368054

Alternate ID(s):: OSTI ID: 1349700

Report Number(s):: IS-J 9349; PRBMDO; TRN: US1702648

Journal Information:: Physical Review B, Vol. 95, Issue 15; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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