Tuning the Kondo effect in Yb(Fe1-xCox)2Zn20
Abstract
We study the evolution of the Kondo effect in heavy fermion compounds, Yb(Fe1-xCox)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 TK ~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.
- Authors:
-
- Ames Lab., Ames, IA (United States)
- Publication Date:
- Research Org.:
- Ames Lab., Ames, IA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1368054
- Alternate Identifier(s):
- OSTI ID: 1349700
- Report Number(s):
- IS-J 9349
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1702648
- Grant/Contract Number:
- DE-AC02-07CH11358; AC02-07CH11358
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 95; Journal Issue: 15; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Citation Formats
Kong, Tai, Taufour, Valentin, Bud'ko, Sergey L., and Canfield, Paul C. Tuning the Kondo effect in Yb(Fe1-xCox)2Zn20. United States: N. p., 2017.
Web. doi:10.1103/PhysRevB.95.155103.
Kong, Tai, Taufour, Valentin, Bud'ko, Sergey L., & Canfield, Paul C. Tuning the Kondo effect in Yb(Fe1-xCox)2Zn20. United States. https://doi.org/10.1103/PhysRevB.95.155103
Kong, Tai, Taufour, Valentin, Bud'ko, Sergey L., and Canfield, Paul C. 2017.
"Tuning the Kondo effect in Yb(Fe1-xCox)2Zn20". United States. https://doi.org/10.1103/PhysRevB.95.155103. https://www.osti.gov/servlets/purl/1368054.
@article{osti_1368054,
title = {Tuning the Kondo effect in Yb(Fe1-xCox)2Zn20},
author = {Kong, Tai and Taufour, Valentin and Bud'ko, Sergey L. and Canfield, Paul C.},
abstractNote = {We study the evolution of the Kondo effect in heavy fermion compounds, Yb(Fe1-xCox)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 TK ~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.},
doi = {10.1103/PhysRevB.95.155103},
url = {https://www.osti.gov/biblio/1368054},
journal = {Physical Review B},
issn = {2469-9950},
number = 15,
volume = 95,
place = {United States},
year = {Mon Apr 03 00:00:00 EDT 2017},
month = {Mon Apr 03 00:00:00 EDT 2017}
}
Web of Science
Figures / Tables:
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