Induced random fields in the LiHoxY1-xF4 quantum Ising magnet in a transverse magnetic field.

Physical review letters · 2006 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 3523

Study snapshot

PublicationPhysical review letters · 2006

Study typeother

Reported directionUnclear

Evidence ratingInsufficient

Abstract

The LiHoxY1-xF4 magnetic material in a transverse magnetic field Bx x perpendicular to the Ising spin direction has long been used to study tunable quantum phase transitions in a random disordered system. We show that the Bx-induced magnetization along the x direction, combined with the local random dilution-induced destruction of crystalline symmetries, generates, via the predominant dipolar interactions between Ho3+ ions, random fields along the Ising z direction. This identifies LiHoxY1-xF4 in Bx as a new random field Ising system. The random fields explain the rapid decrease of the critical temperature in the diluted ferromagnetic regime and the smearing of the nonlinear susceptibility at the spin-glass transition with increasing Bx and render the Bx-induced quantum criticality in LiHoxY1-xF4 likely inaccessible.

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Study typeother

Effect directionunclear

PopulationNot supplied

Sample sizeNot supplied

ExposureNot supplied

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

In LiHoxY1-xF4, a transverse magnetic field (Bx) induces magnetization along x which, together with dilution-induced symmetry breaking and dipolar interactions, generates random fields along the Ising z direction. The authors state these random fields explain the rapid decrease of critical temperature in the diluted ferromagnetic regime and the smearing of nonlinear susceptibility at the spin-glass transition with increasing Bx, and suggest Bx-induced quantum criticality is likely inaccessible.

Outcomes measured

Random fields induced in LiHoxY1-xF4 under transverse magnetic field
Critical temperature behavior in diluted ferromagnetic regime
Nonlinear susceptibility behavior at spin-glass transition
Accessibility of Bx-induced quantum criticality

View raw extracted JSON

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  "outcomes": [
    "Random fields induced in LiHoxY1-xF4 under transverse magnetic field",
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    "Accessibility of Bx-induced quantum criticality"
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  "main_findings": "In LiHoxY1-xF4, a transverse magnetic field (Bx) induces magnetization along x which, together with dilution-induced symmetry breaking and dipolar interactions, generates random fields along the Ising z direction. The authors state these random fields explain the rapid decrease of critical temperature in the diluted ferromagnetic regime and the smearing of nonlinear susceptibility at the spin-glass transition with increasing Bx, and suggest Bx-induced quantum criticality is likely inaccessible.",
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    "LiHoxY1-xF4",
    "quantum Ising magnet",
    "transverse magnetic field",
    "random field Ising system",
    "dipolar interactions",
    "dilution disorder",
    "critical temperature",
    "nonlinear susceptibility",
    "spin-glass transition",
    "quantum criticality"
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Identifiers and source

DOI: 10.1103/physrevlett.97.237203
PubMed: 17280239

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