Universität zu Köln

Gannon, W. J., Chen, K., Sundermann, M., Strigari, F., Utsumi, Y., Tsuei, K. -D., Rueff, J. -P., Bencok, P., Tanaka, A., Severing, A. and Aronson, M. C. (2018). Intermediate valence in single crystalline Yb2Si2Al. Phys. Rev. B, 98 (7). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

Yb2Si2Al may be a prototype for exploring different aspects of the Shastry-Sutherland lattice, formed by planes of orthogonally coupled Yb ions. Measurements of the magnetic susceptibility find incoherently fluctuating Yb3+ moments coexisting with a weakly correlated metallic state that is confirmed by measurements of the electrical resistivity. Increasing signs of Kondo coherence are found with decreasing temperature, including an enhanced Sommerfeld coefficient and Kadowaki-Woods ratio that signal that the metallic state found at the lowest temperatures is a Fermi liquid where correlations have become significantly stronger. A pronounced peak in the electronic and magnetic specific heat indicates that the coupling of the Yb moments to the conduction electrons leads to an effective Kondo temperature that is approximately 30 K. The valence of Yb2Si2Al has been investigated with electron spectroscopy methods. Yb2Si2Al is found to be strongly intermediate valent [v(F) = 2.68(2) at 80 K]. Taken together, these experimental data are consistent with a scenario where a coherent Kondo lattice forms in Yb2Si2Al from an incoherently fluctuating ensemble of Yb moments with incomplete Kondo compensation, and strong intermediate valence character.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Gannon, W. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Chen, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sundermann, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Strigari, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Utsumi, Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tsuei, K. -D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rueff, J. -P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bencok, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tanaka, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Severing, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Aronson, M. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-177526
DOI:	10.1103/PhysRevB.98.075101
Journal or Publication Title:	Phys. Rev. B
Volume:	98
Number:	7
Date:	2018
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language RARE-EARTH TETRABORIDES; HEAVY-FERMION COMPOUNDS; PHOTOELECTRON-SPECTROSCOPY; QUANTUM CRITICALITY; INTERMETALLIC COMPOUNDS; PHYSICAL-PROPERTIES; PHASE-TRANSITIONS; GROUND-STATE; METAL; MODEL Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/17752