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DC Field | Value | Language |
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dc.contributor.author | Labarta, Amílcar | cat |
dc.contributor.author | Batlle Gelabert, Xavier | cat |
dc.contributor.author | Martínez Benjamin, Joan Josep | cat |
dc.contributor.author | Obradors, Xavier | cat |
dc.date.accessioned | 2009-10-30T09:50:25Z | - |
dc.date.available | 2009-10-30T09:50:25Z | - |
dc.date.issued | 1992 | cat |
dc.identifier.issn | 0163-1829 | cat |
dc.identifier.uri | http://hdl.handle.net/2445/9892 | - |
dc.description.abstract | ac and dc magnetic susceptibility as a function of frequency, magnetic field, and temperature have been studied in polycrystalline BaCo 6 Ti 6 O 19 . This oxide displays all the common features of spin-glass-like behavior. dc magnetic susceptibility at low fields shows a sharp peak at ca. 13.6 K, which signals the onset of irreversibility between the zero-field-cooled and field-cooled (FC) processes. Isothermal magnetization curves obtained from FC data have been fitted in terms of odd powers of ( χ 0 H). The first two coefficients of the nonlinear susceptibility increase by more than three orders of magnitude when approaching T c from above, thus indicating the occurrence of an equilibrium phase transition. Static scaling analysis of the nonlinear susceptibility leads to the following set of critical parameters: δ=7.9±0.3, φ=5.7±0.5, T c =13.21±0.05. The reliability of this set has been checked by reference to the asymptotic behavior of the scaling function. The unusually high values of the δ and φ exponents could be related to some degree of reduction of the spin dimensionality, because of the planar contribution to the anisotropy of Co 2 + ions when located at octahedral sites. Dynamic scaling has been developed from ac susceptibility data assuming power-law divergence of the relaxation time, yielding the following set of parameters (zν=8.0±0.5, β=0.75±0.10, T c =13.20±0.05). The value of zν has also been confirmed by studying the dependence of the freezing temperature on frequency. The β, δ, φ values roughly accomplish the scaling relation β=φ/δ. Thermoremanent-magnetization data show the common aging phenomena in disordered magnetic systems, as expected in spin glasses. | - |
dc.format.extent | 8 p. | cat |
dc.format.mimetype | application/pdf | eng |
dc.language.iso | eng | eng |
dc.publisher | The American Physical Society | - |
dc.relation.isformatof | Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.46.8994 | cat |
dc.relation.ispartof | Physical Review B, 1992, vol. 46, núm. 14, p. 8994-9001. | cat |
dc.relation.uri | http://dx.doi.org/10.1103/PhysRevB.46.8994 | - |
dc.rights | (c) The American Physical Society, 1992 | cat |
dc.source | Articles publicats en revistes (Física de la Matèria Condensada) | - |
dc.subject.classification | Propietats magnètiques | cat |
dc.subject.classification | Transformacions de fase (Física estadística) | cat |
dc.subject.classification | Materials magnètics | cat |
dc.subject.other | Magnetic properties | eng |
dc.subject.other | Phase transformations (Statistical physics) | eng |
dc.subject.other | Magnetic materials | eng |
dc.title | Magnetic study of spin freezing in the spin glass BaCo6Ti6O19: Static and dynamic analysis | eng |
dc.type | info:eu-repo/semantics/article | cat |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 82546 | cat |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Física de la Matèria Condensada) |
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