6533b854fe1ef96bd12afbe7
RESEARCH PRODUCT
Disordered and Frustrated Spin Systems
A. Peter YoungKurt Bindersubject
Spin glassMaterials scienceCondensed matter physicsSpinsmedia_common.quotation_subjectGeometrical frustrationFrustrationPercolation thresholdCondensed Matter::Disordered Systems and Neural NetworksFerromagnetismOrder and disorderAntiferromagnetismCondensed Matter::Strongly Correlated Electronsmedia_commondescription
A brief review on the effects of quenched disorder on magnetic ordering is given. This disorder can be due to dilution of a ferro- or antiferromagnetic crystal with nonmagnetic atoms, or due to noncrystallinity (amorphous magnetic systems). This disorder in the positions of the magnetic atoms leads to disorder in the exchange interactions between spins. If the disorder is sufficiently weak, the critical temperature of magnetic ordering is somewhat decreased, and the critical behavior may change, but the nature of ordering is maintained. However, if the disorder is sufficiently strong, magnetic long-range order may disappear altogether at a percolation threshold, or a new type of order may appear, the ‘spin glass’, in which spins freeze in random directions because of random competition between ferro- and antiferromagnetic interactions. In this context, we also mention magnetic systems with ‘frustration’ of their exchange interactions but without disorder. Finally, another important class of phenomena occurs for systems with ‘random fields’, an example of which is provided by diluted antiferromagnets in a uniform field. Keywords: spin glasses; diluted ferromagnets; amorphous magnets; random fields; frustration; percolation
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2007-12-15 |