dc.contributor |
Universitat de Barcelona |
dc.contributor.author |
Labarta, Amílcar |
dc.contributor.author |
Batlle Gelabert, Xavier |
dc.contributor.author |
Martínez Benjamin, Joan Josep |
dc.contributor.author |
Obradors, Xavier |
dc.date |
2009-10-30T09:50:25Z |
dc.date |
2009-10-30T09:50:25Z |
dc.date |
1992 |
dc.identifier.citation |
0163-1829 |
dc.identifier.citation |
82546 |
dc.identifier.uri |
http://hdl.handle.net/2445/9892 |
dc.format |
8 p. |
dc.format |
application/pdf |
dc.language.iso |
eng |
dc.publisher |
The American Physical Society |
dc.relation |
Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.46.8994 |
dc.relation |
Physical Review B, 1992, vol. 46, núm. 14, p. 8994-9001. |
dc.relation |
http://dx.doi.org/10.1103/PhysRevB.46.8994 |
dc.rights |
(c) The American Physical Society, 1992 |
dc.rights |
info:eu-repo/semantics/openAccess |
dc.subject |
Propietats magnètiques |
dc.subject |
Transformacions de fase (Física estadística) |
dc.subject |
Materials magnètics |
dc.subject |
Magnetic properties |
dc.subject |
Phase transformations (Statistical physics) |
dc.subject |
Magnetic materials |
dc.title |
Magnetic study of spin freezing in the spin glass BaCo6Ti6O19: Static and dynamic analysis |
dc.type |
info:eu-repo/semantics/article |
dc.type |
info:eu-repo/semantics/publishedVersion |
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. |