New observations concerning the low-temperature properties of the carrier-poor heavy-fermion system Yb4As3

R. Helfrich; M. Köppen; M. Lang; F. Steglich; A. Ochiai

doi:10.1016/S0304-8853(97)00691-4

New observations concerning the low-temperature properties of the carrier-poor heavy-fermion system Yb₄As₃

R. Helfrich, M. Köppen, M. Lang, F. Steglich, A. Ochiai

Research output: Contribution to journal › Article › peer-review

34 Citations (Scopus)

Abstract

We report low-temperature specific-heat and thermal-expansion results on the carrier-poor system Yb₄As₃ as well as Yb₄(As_1-yX_y)3, X: P, Sb. We infer that Yb₄As₃ behaves as a two-fluid system with almost decoupled spin and charge excitations. Quasi-one-dimensional spin excitations within S = 1/2 Heisenberg chains of Yb³⁺ ions formed in the charge-ordered state dominate the low-temperature thermodynamic properties. The effect of a magnetic field is to open a (pseudo-)gap in the low-energy spin-excitation spectrum. The Grüneisen parameter shows rather anomalous temperature and field dependences.

Original language	English
Pages (from-to)	309-310
Number of pages	2
Journal	Journal of Magnetism and Magnetic Materials
Volume	177-181
Issue number	PART 1
DOIs	https://doi.org/10.1016/S0304-8853(97)00691-4
Publication status	Published - 1998 Jan
Externally published	Yes

Keywords

Grüneisen parameter
Heavy fermions
Heisenberg chain
Low-carrier-density system
Rare earth pnictides

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1016/S0304-8853(97)00691-4

Cite this

@article{8f0c441f42644bd599bd3c5508a2669a,

title = "New observations concerning the low-temperature properties of the carrier-poor heavy-fermion system Yb4As3",

abstract = "We report low-temperature specific-heat and thermal-expansion results on the carrier-poor system Yb4As3 as well as Yb4(As1-yXy)3, X: P, Sb. We infer that Yb4As3 behaves as a two-fluid system with almost decoupled spin and charge excitations. Quasi-one-dimensional spin excitations within S = 1/2 Heisenberg chains of Yb3+ ions formed in the charge-ordered state dominate the low-temperature thermodynamic properties. The effect of a magnetic field is to open a (pseudo-)gap in the low-energy spin-excitation spectrum. The Gr{\"u}neisen parameter shows rather anomalous temperature and field dependences.",

keywords = "Gr{\"u}neisen parameter, Heavy fermions, Heisenberg chain, Low-carrier-density system, Rare earth pnictides",

author = "R. Helfrich and M. K{\"o}ppen and M. Lang and F. Steglich and A. Ochiai",

note = "Funding Information: We are grateful to P. Fulde, P. Thalmeier, B. Schmidt and R. Pittini for stimulating discussions. This work was supported by the BMBF grant no. 13N6608/1.",

year = "1998",

month = jan,

doi = "10.1016/S0304-8853(97)00691-4",

language = "English",

volume = "177-181",

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TY - JOUR

T1 - New observations concerning the low-temperature properties of the carrier-poor heavy-fermion system Yb4As3

AU - Helfrich, R.

AU - Köppen, M.

AU - Lang, M.

AU - Steglich, F.

AU - Ochiai, A.

N1 - Funding Information: We are grateful to P. Fulde, P. Thalmeier, B. Schmidt and R. Pittini for stimulating discussions. This work was supported by the BMBF grant no. 13N6608/1.

PY - 1998/1

Y1 - 1998/1

N2 - We report low-temperature specific-heat and thermal-expansion results on the carrier-poor system Yb4As3 as well as Yb4(As1-yXy)3, X: P, Sb. We infer that Yb4As3 behaves as a two-fluid system with almost decoupled spin and charge excitations. Quasi-one-dimensional spin excitations within S = 1/2 Heisenberg chains of Yb3+ ions formed in the charge-ordered state dominate the low-temperature thermodynamic properties. The effect of a magnetic field is to open a (pseudo-)gap in the low-energy spin-excitation spectrum. The Grüneisen parameter shows rather anomalous temperature and field dependences.

AB - We report low-temperature specific-heat and thermal-expansion results on the carrier-poor system Yb4As3 as well as Yb4(As1-yXy)3, X: P, Sb. We infer that Yb4As3 behaves as a two-fluid system with almost decoupled spin and charge excitations. Quasi-one-dimensional spin excitations within S = 1/2 Heisenberg chains of Yb3+ ions formed in the charge-ordered state dominate the low-temperature thermodynamic properties. The effect of a magnetic field is to open a (pseudo-)gap in the low-energy spin-excitation spectrum. The Grüneisen parameter shows rather anomalous temperature and field dependences.

KW - Grüneisen parameter

KW - Heavy fermions

KW - Heisenberg chain

KW - Low-carrier-density system

KW - Rare earth pnictides

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