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Phys. Rev. B 71, 174304 (2005) [6 pages]

Tunable thermal expansion behavior in the intermetallic YbGaGe

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F. R. Drymiotis
Los Alamos National Laboratory, Los Alamos, New Mexico 87545 USA

Y. Lee
Physics Department, Brookhaven National Laboratory, Upton, New York 11973 USA

G. Lawes, J. C. Lashley, and T. Kimura
Los Alamos National Laboratory, Los Alamos, New Mexico 87545 USA

S. M. Shapiro
Physics Department, Brookhaven National Laboratory, Upton, New York 11973 USA

A. Migliori and V. Correa
Los Alamos National Laboratory, Los Alamos, New Mexico 87545 USA

R. A. Fisher
Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720 USA

Received 19 October 2004; revised 12 January 2005; published 25 May 2005

We investigate the effects of carbon and boron doping on the thermal expansion of the hexagonal (P63∕mmc) intermetallic YbGaGe. X-ray powder diffraction was used to measure the lattice constants on pure and doped (C or B at nominal levels of 0.5%) samples from T∼10 K to T∼300 K. Also measured were resistivity, specific heat, and magnetic susceptibility. While the pure YbGaGe samples exhibit positive thermal volume expansion, (V300 K-V10 K)∕V300 K=0.94, the volume expansion in the lightly C- or B-doped samples changes slope and tends toward zero-volume expansion. Such a strong response to light doping suggests that the underlying mechanism for the reported zero-volume expansion is substitutional disorder, and not the previously proposed valence fluctuations.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.71.174304
DOI:
10.1103/PhysRevB.71.174304
PACS:
61.10.Nz, 61.43.−j
 
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