Relaxation in a spin glass system with competing magnetic interactions: Fe<sub>0.16</sub>Cr<sub>0.84</sub>

Palumbo, A. C.; Parks, R. D.; Yeshurun, Y.

doi:10.1088/0022-3719/15/24/007

Cited by 13 publications

(4 citation statements)

References 8 publications

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“…Defining the freezing temperature, T f , as the maximum in the zero-field cooled curve a value of T f = 20 K is determined for the smallest applied field (B a = 1.6 mT). This value is in good agreement with findings of Palumbo et al (1982). The field dependence of T f fits to a power law with exponent ∼0.32, which is close to 0.43 reported for a sample with x = 0.16 (Palumbo et al 1983).…”

Section: Resultssupporting

confidence: 92%

Spin correlation times in above the freezing temperature

Bogner

Reissner

Steiner

et al. 1998

J. Phys.: Condens. Matter

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Magnetic correlations up to ten times the freezing temperature are determined in the spin glass Cr 0.825 Fe 0.175 by high-field Mössbauer spectroscopy. The model based on stochastic formation and decay of these correlated regions, used to analyse the spectra of the spin glass systems Y(Fe, Al) 2 and AuFe, is again successfully applied, irrespective of the completely different matrix materials. In agreement with the results obtained for these systems a power law for the temperature dependence of the correlation time with an exponent close to −2 is observed. This exponent is also found for the temperature dependence of the relaxation rate if the µSR measurements on the same sample reported by Telling and Cywinski are analysed according to a Kohlrausch law.

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Section: Resultssupporting

confidence: 92%

Spin correlation times in above the freezing temperature

Bogner

Reissner

Steiner

et al. 1998

J. Phys.: Condens. Matter

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“…One is the low-temperature region, in which the AT line can be approximated using the H 2 o ( log T function. Experimental evidence for this formula was claimed by Parks, Palumbo and Yeshurun (1982) for Fe0.16Cr0.84. The second is the vicinity of the ferro-para-spin-glass multicritical point.…”

Section: Discussionmentioning

confidence: 76%

Effective exponents for de almeida-thouless line

Zięba¹,

Łodziana²

1996

Phase Transitions

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The experimental irreversibility line at the magnetic phase diagram H-T of spin glasses is often approximated using a power law H (x( Tc -T)"*. The mean field theory of de Almeida and Thouless predicts 9=3 for temperatures T close to the spin-glass transition temperature Tc. For a range of reduced temperature involved in an experiment one should use, however, effective exponents (9>3) obtained by fitting the power law to the exact expression for de Almeida-Thouless line. These compare favorably with experimental values of 9 obtained for different spin glasses. The increase of effective exponent up to 9=7 on approaching the spin-glass-ferromagnetism multicritical point is also considered.

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“…Considering complex magnetic interaction pathways in Ho 5 Sn 3 , the possibility of spin frustration cannot be ruled out [59]. This is also supported by the fact that θ p is small and positive despite the occurrence of AFM transition at around 28 K. To address the issue, we performed magnetic relaxation measurement at three temperatures, T i = 8 K, 20 K and 32 K. The sample is cooled from 150 K under H = 100 Oe.…”

Section: Magnetocaloric Effectmentioning

confidence: 99%

Competing magnetic interactions and magnetocaloric effect in Ho₅Sn₃

Mondal¹,

Yadav²,

Sarkar³

et al. 2021

J. Phys.: Condens. Matter

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The rare-earth intermetallic compound Ho5Sn3 demonstrates fascinating magnetic properties, which include temperature-driven multiple magnetic transitions and field-driven metamagnetism. We address the magnetic character of this exciting compound through a combined experimental and theoretical studies. Ho5Sn3 orders antiferromagnetically below 28 K, and shows further spin reorientation transitions at 16 K and 12 K. We observe a sizable amount of low-temperature magnetocaloric effect (MEC) in Ho5Sn3 with a maximum value of entropy change ΔS = −9.5 J Kg−1 K−1 for an applied field of H = 50 kOe at around 30 K. The field hysteresis is almost zero above 15 K where the MEC is important. Interestingly, ΔS is found to change its sign from positive to negative as the temperature is increased above about 8 K, which can be linked to the multiple spin reorientation transitions. The signature of the metamagnetism is visible in the ΔS versus H plot. The magnetic ground state, obtained from the density functional theory based calculation, is susceptible to the effective Coulomb interaction (U eff) between electrons. Depending upon the value of U eff, the ground state can be ferromagnetic or antiferromagnetic. The compound shows large relaxation (14% change in magnetisation in 60 min) in the field cooled state with a logarithmic time variation, which may be connected to the competing magnetic correlations observed in our theoretical calculations. The competing magnetic ground states are equally evident from the small value of the paramagnetic Curie–Weiss temperature.

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Relaxation in a spin glass system with competing magnetic interactions: Fe_0.16Cr_0.84

Cited by 13 publications

References 8 publications

Spin correlation times in above the freezing temperature

Spin correlation times in above the freezing temperature

Effective exponents for de almeida-thouless line

Competing magnetic interactions and magnetocaloric effect in Ho₅Sn₃

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Relaxation in a spin glass system with competing magnetic interactions: Fe0.16Cr0.84

Cited by 13 publications

References 8 publications

Spin correlation times in above the freezing temperature

Spin correlation times in above the freezing temperature

Effective exponents for de almeida-thouless line

Competing magnetic interactions and magnetocaloric effect in Ho5Sn3

Contact Info

Product

Resources

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Relaxation in a spin glass system with competing magnetic interactions: Fe_0.16Cr_0.84

Competing magnetic interactions and magnetocaloric effect in Ho₅Sn₃