Quasispin glass in a geometrically frustrated magnet

A. D. Laforge; S. H. Pulido; R. J. Cava; B. C. Chan; A. P. Ramirez

doi:10.1103/PhysRevLett.110.017203

Quasispin glass in a geometrically frustrated magnet

A. D. Laforge, S. H. Pulido, R. J. Cava, B. C. Chan, A. P. Ramirez

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31 Scopus citations

Abstract

The spin glass state in the spinel ZnCr_2(1-x)Ga _2xO₄ is studied with magnetization and specific heat for x<0.05. The freezing temperature is independent of disorder, despite a two-level-like density of states that varies linearly with x. This relationship implies the energy scale for freezing is independent of disorder, in contrast to mean field theories of spin glass. We suggest that the degrees of freedom are shielded spin vacancies, quasispins, which interact via an emergent long-range force mediated by the frustrated spin background.

Original language	English (US)
Article number	017203
Journal	Physical review letters
Volume	110
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevLett.110.017203
State	Published - Jan 4 2013

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.110.017203

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AU - Laforge, A. D.

AU - Pulido, S. H.

AU - Cava, R. J.

AU - Chan, B. C.

AU - Ramirez, A. P.

PY - 2013/1/4

Y1 - 2013/1/4

N2 - The spin glass state in the spinel ZnCr2(1-x)Ga 2xO4 is studied with magnetization and specific heat for x<0.05. The freezing temperature is independent of disorder, despite a two-level-like density of states that varies linearly with x. This relationship implies the energy scale for freezing is independent of disorder, in contrast to mean field theories of spin glass. We suggest that the degrees of freedom are shielded spin vacancies, quasispins, which interact via an emergent long-range force mediated by the frustrated spin background.

AB - The spin glass state in the spinel ZnCr2(1-x)Ga 2xO4 is studied with magnetization and specific heat for x<0.05. The freezing temperature is independent of disorder, despite a two-level-like density of states that varies linearly with x. This relationship implies the energy scale for freezing is independent of disorder, in contrast to mean field theories of spin glass. We suggest that the degrees of freedom are shielded spin vacancies, quasispins, which interact via an emergent long-range force mediated by the frustrated spin background.

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JO - Physical review letters

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Quasispin glass in a geometrically frustrated magnet

Abstract

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