Universität zu Köln

Shimura, Y., Woerl, A., Sundermann, M., Tsuda, S., Adroja, D. T., Bhattacharyya, A., Strydom, A. M., Hillier, A. D., Pratt, F. L., Gloskovskii, A., Severing, A., Onimaru, T., Gegenwart, P. and Takabatake, T. (2021). Antiferromagnetic Correlations in Strongly Valence Fluctuating CeIrSn. Phys. Rev. Lett., 126 (21). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

CeIrSn with a quasikagome Ce lattice in the hexagonal basal plane is a strongly valence fluctuating compound, as we confirm by hard x-ray photoelectron spectroscopy and inelastic neutron scattering, with a high Kondo temperature of T-K similar to 480 K. We report a negative in-plane thermal expansion alpha/T below 2 K, which passes through a broad minimum near 0.75 K. Volume and a-axis magnetostriction for B parallel to a are markedly negative at low fields and change sign before a sharp metamagnetic anomaly at 6 T. These behaviors are unexpected for Ce-based intermediate valence systems, which should feature positive expansivity. Rather they point towards antiferromagnetic correlations at very low temperatures. This is supported by muon spin relaxation measurements down to 0.1 K, which provide microscopic evidence for a broad distribution of internal magnetic fields. Comparison with isostructural CeRhSn suggests that these antiferromagnetic correlations emerging at T << T-K result from geometrical frustration.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Shimura, Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED Woerl, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sundermann, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tsuda, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Adroja, D. T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bhattacharyya, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Strydom, A. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hillier, A. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pratt, F. L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gloskovskii, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Severing, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Onimaru, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gegenwart, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Takabatake, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-599002
DOI:	10.1103/PhysRevLett.126.217202
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	126
Number:	21
Date:	2021
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1079-7114
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language THERMAL-EXPANSION; MAGNETOSTRICTION; PARAMETERS; TRANSITION; CERHSN; CERIUM Multiple languages Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59900