Dynamics of the re-entrant spinglass crossover in NiMn films probed via resistance fluctuations and ac magnetoresistance

Keener, C. D.; Weissman, M. B.

doi:10.1016/0304-8853(95)00481-5

Cited by 7 publications

(2 citation statements)

References 26 publications

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“…= Ct 1/2 w can be fitted for applied field in the range 1500<H<6500 Oe, and yields zero field transition temperature T w (0)=35.4(1) K. Qualitatively, the reentrant behavior of the GT line for the present compound is in good agreement with that predicted by the theoretical model for Heisenberg spin glass with a uniaxial anisotropy as discussed earlier. 53 A reentrant behavior of the GT line has also been observed experimentally in a heavy fermion URh 2 Ge 2 Ising spin glass 55 and other Heisenberg spin glasses 80,81 with uniaxial anisotropy fields. Therefore, the observed reentrant behavior of the GT line in the La 0.9 Sr 0.1 CoO 3 single crystal is attributed to the presence of a finite single-ion anisotropy in the compound.…”

Section: H−t Phase Diagramsupporting

confidence: 52%

“…55 Similar field dependence of the freezing temperature has also been observed in different other real spin glasses. [77][78][79][80][81] ature shifted towards the high temperature as found from its temperature derivative (dM ZF C /dT = 0). The ZFC curve at 1250 Oe reveals that with decreasing temperature it first attains a maximum at the so called freezing temperature T f (H)=35.32 K, nearly the same temperature at which the FC and ZFC start to bifurcate and then show a sudden down turn occurring at a lower temperature T s (H) which marks the onset of strong irreversibility.…”

Section: H−t Phase Diagrammentioning

confidence: 78%

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Critical exponents and irreversibility lines of La0.9Sr0.1CoO3 single crystal

Khan

Midya

Mandal

et al. 2013

Journal of Applied Physics

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We have studied the dynamic and static critical behavior of spin glass transition in insulating La0.9Sr0.1CoO3 single crystal by ac susceptibility and dc magnetization measurements in the vicinity of its freezing temperature (T f ). The dynamic scaling analysis of the frequency dependence of ac susceptibility data yields the characteristic time constant τ0=1.6(9)×10 −12 s, the dynamic critical exponent zν=9.5(2), and a frequency dependence factor K=∆T f /T f (∆logf )=0.017, indicating that the sample enters into a canonical spin-glass phase below T f =34.8(2) K. The scaling analysis of non-linear magnetization in the vicinity of T f through the static scaling hypothesis yields critical exponents β=0.89(1) and γ=2.9(1), which match well with that observed for well known three-dimensional (3D) Heisenberg spin glasses. From the longitudinal component of zero-field-cooled and field-cooled magnetization measurement we have constructed the H − T phase diagram which represents the field evolution of two characteristic temperatures: the upper one, Tw(H), indicates the onset of spin freezing in a uniform external field H, while the lower one, Ts(H), marks the onset of strong irreversibility of the frozen state. The low field Ts(H) follows the critical line suggested by d'Almeida-Thouless model for canonical spin glass, whereas the Tw(H) exhibits a re-entrant behavior with a maximum in the Tw(H) at a nonzero field above which it follows the Gabay-Toulouse (GT) critical line which is a characteristic of Heisenberg spin glass. The reentrant behavior of the GT line resembles that predicted theoretically for n-component vector spin glasses in the presence of a uniaxial anisotropy field. PACS number(s): 75.40.Cx,75.47.Gk,71.30.+h

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