Antiferromagnetic spin-glass

Shell, J.; Cowen, J. A.; Foiles, C. L.

doi:10.1103/physrevb.25.6015

Cited by 12 publications

(5 citation statements)

References 8 publications

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“…Shell et al noted that SG behavior can be observed as far as θ CW ≃ −2.5 × T g . Over the whole range of composition, the material exhibits pure Curie-Weiss behavior only for very small cobalt doping and around x = 0.50, where θ CW = −9 K. For this composition, the ratio θ CW /T g ≃ −1 is close to that reported for disordered antiferromagnetic spin glass (Cu 3 Pt) (1−x) Mn x [23].…”

Section: Resultssupporting

confidence: 76%

Spin Glass ground state in Mn$_{1-x}$Co$_{x}$Si

Teyssier,

Giannini,

Guritanu

et al. 2010

Preprint

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We report the discovery of a new spin glass ground state in the transition metal monosilicides with the B20 crystallographic structure. Magnetic, transport, neutron and muon investigation of the solid solution Mn1−xCoxSi have revealed a new dome in the phase diagram with evidence of antiferromagnetic interactions. For Mn rich compounds, a sharp decrease of the Curie temperature is observed upon Co doping and neutron elastic scattering shows that helimagnetic order of MnSi persists up to x = 0.05 with a shortening of the helix period. For higher Co (0.05 < x < 0.90) concentrations, the Curie-Weiss temperature changes sign and the system enters a spin glass state upon cooling (Tg = 9 K for xCo = 0.50), due to chemical disorder. In this doping range, a minimum appears in the resistivity, attributed to scattering of conduction electron by localized magnetic moments.

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Section: Resultssupporting

confidence: 76%

Spin Glass ground state in Mn$_{1-x}$Co$_{x}$Si

Teyssier,

Giannini,

Guritanu

et al. 2010

Preprint

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“…Above T EB the shell spins are paramagnetic, thus the coercive field becomes lower. It should be noted that the non-magnetic defects in the AFM may cause a spin glass state in the dilute samples [33] and that a spin glass does induce EB effects in layer structures [34,35]. Moreover, spin glass behaviors are reported in Co/CoO core-shell nanoparticle systems [9] as well as single nanoparticles [22].…”

Section: Resultsmentioning

confidence: 99%

Defect-tuning exchange bias of ferromagnet/antiferromagnet core/shell nanoparticles by numerical study

Mao¹,

Zhan²,

Chen³

2012

J. Phys.: Condens. Matter

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The influence of non-magnetic defects on the exchange bias (EB) of ferromagnet (FM)/antiferromagnet (AFM) core/shell nanoparticles is studied by Monte Carlo simulations. It is found that the EB can be tuned by defects in different positions. Defects at both the AFM and FM interfaces reduce the EB field while they enhance the coercive field by decreasing the effective interface coupling. However, the EB field and the coercive field show respectively a non-monotonic and a monotonic dependence on the defect concentration when the defects are located inside the AFM shell, indicating a similar microscopic mechanism to that proposed in the domain state model. These results suggest a way to optimize the EB effect for applications.

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“…36,37 It is natural to associate this type of order with an RKKY SG or a CG phase. 19,[31][32][33] In order to extract quantitative information from the zerofield µSR data, we have fitted the time-dependence of the muon asymmetry with the following model:…”

Section: B Zero-field µSr (Afm Phase)mentioning

confidence: 99%

“…Metallic compounds with pronounced Fermi-surface nesting, which are close to a spin-density-wave (SDW) instability, are especially promising as model systems for demonstration of the above-mentioned effects, because the RKKY interaction is known to be enhanced at the nesting vector. 30 Hence, if localized magnetic moments are randomly embedded into such a metal to form a so-called RKKY spin glass (SG), [31][32][33] the long-range superexchange between them 34 is expected to support magnetic correlations between antiferromagnetic (AFM) rare regions with the same SDW wave vector. The RKKY interaction in layered metals with Fermi surface nesting has been considered theoretically, for example, in Refs.…”

Section: Introduction a Magnetic Phase Transitions In Disordered Systemsmentioning

confidence: 99%

Possible realization of an antiferromagnetic Griffiths phase in Ba(Fe1−xMnx)2
Inosov
¹
,
Friemel
²
,
Park
³

et al. 2013
Phys. Rev. B
49
5
84
0
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We investigate magnetic ordering in metallic Ba(Fe 1−x Mn x ) 2 As 2 and discuss the unusual magnetic phase, which was recently discovered for Mn concentrations x > 10%. We argue that it can be understood as a Griffiths-type phase that forms above the quantum critical point associated with the suppression of the stripe-antiferromagnetic spin-density-wave (SDW) order in BaFe 2 As 2 by the randomly introduced localized Mn moments acting as strong magnetic impurities. While the SDW transition at x = 0, 2.5% and 5% remains equally sharp, in the x = 12% sample we observe an abrupt smearing of the antiferromagnetic transition in temperature and a considerable suppression of the spin gap in the magnetic excitation spectrum. According to our muon-spin-relaxation, nuclear magnetic resonance and neutron-scattering data, antiferromagnetically ordered rare regions start forming in the x = 12% sample significantly above the Néel temperature of the parent compound. Upon cooling, their volume grows continuously, leading to an increase in the magnetic Bragg intensity and to the gradual opening of a partial spin gap in the magnetic excitation spectrum. Using neutron Larmor diffraction, we also demonstrate that the magnetically ordered volume is characterized by a finite orthorhombic distortion, which could not be resolved in previous diffraction studies most probably due to its coexistence with the tetragonal phase and a microstrain-induced broadening of the Bragg reflections. We argue that Ba(Fe 1−x Mn x ) 2 As 2 could represent an interesting model spin-glass system, in which localized magnetic moments are randomly embedded into a SDW metal with Fermi surface nesting.

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Antiferromagnetic spin-glass

Cited by 12 publications

References 8 publications

Spin Glass ground state in Mn$_{1-x}$Co$_{x}$Si

Spin Glass ground state in Mn$_{1-x}$Co$_{x}$Si

Defect-tuning exchange bias of ferromagnet/antiferromagnet core/shell nanoparticles by numerical study

Possible realization of an antiferromagnetic Griffiths phase in Ba(Fe1−xMnx)2
Inosov
¹
,
Friemel
²
,
Park
³

et al. 2013
Phys. Rev. B
49
5
84
0
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Antiferromagnetic spin-glass

Cited by 12 publications

References 8 publications

Spin Glass ground state in Mn$_{1-x}$Co$_{x}$Si

Spin Glass ground state in Mn$_{1-x}$Co$_{x}$Si

Defect-tuning exchange bias of ferromagnet/antiferromagnet core/shell nanoparticles by numerical study

Possible realization of an antiferromagnetic Griffiths phase in Ba(Fe1−xMnx)2Inosov1, Friemel2, Park3 et al. 2013Phys. Rev. B495840View full textAdd to dashboardCite

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Possible realization of an antiferromagnetic Griffiths phase in Ba(Fe1−xMnx)2
Inosov
¹
,
Friemel
²
,
Park
³

et al. 2013
Phys. Rev. B
49
5
84
0
View full text Add to dashboard Cite