Understanding the spin glass transition as a dynamic phenomenon

Trachenko, Kostya (2011) Understanding the spin glass transition as a dynamic phenomenon. Journal of Physics: Condensed Matter, 23 (36). p. 366003. DOI 10.1088/0953-8984/23/36/366003

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Abstract

Existing theories explain the spin glass transition in terms of a phase transition and order parameters, and assume the existence of a distinct spin glass phase. In addition to problems related to clarifying the nature of this phase, the common challenge is to explain profound dynamic effects. Here, we propose that the main experimental results of the spin glass transition can be understood in an entirely dynamic picture, without a reference to a distinct spin glass phase, phase transition and order parameters. In this theory, the susceptibility cusp at the glass transition temperature is due to the dynamic crossover between the high-temperature relaxational and low-temperature spin wave regimes. The crossover takes place when t D , where t is the observation time and is the relaxation time. Time-dependent effects, inconsistent with the phase transition approach, and the logarithmic increase of Tg with field frequency in particular, originate as the immediate consequence of the proposed picture. In our discussion, we explore similarities between the spin and structural glass transitions

Item Type: Article
Uncontrolled Keywords: 2011AREP; IA63;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Journal of Physics: Condensed Matter
Volume: 23
Page Range: p. 366003
Identification Number: 10.1088/0953-8984/23/36/366003
Depositing User: Sarah Humbert
Date Deposited: 07 Oct 2011 17:26
Last Modified: 23 Jul 2013 10:02
URI: http://eprints.esc.cam.ac.uk/id/eprint/2188

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