Unusual glassy states in LaMn0.5Fe0.5O3: Evidence of two distinct dynamical freezing processes

De, Kajal; Thakur, Mukesh Kumar; Manna, Arun K.; Giri, S.

doi:10.1063/1.2159552

Cited by 57 publications

(31 citation statements)

References 14 publications

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“…The observed low z is very similar to those in La 0.5 Mn 0.5 FeO 3 (Ref. 23) and BiFeO 3 single crystal, 24 which are characterized as a non-classical SG compounds. Although 10 À13 s for a typical SG, the higher value of s 0 indicates a slower spin flipping.…”

Section: Resultssupporting

confidence: 79%

Evidence of exchange bias effect originating from the interaction between antiferromagnetic core and spin glass shell

Zhang¹,

Tang²,

Xu³

et al. 2014

Journal of Applied Physics

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Spin glass behavior and exchange bias effect have been observed in antiferromagnetic SrMn3O6−x nanoribbons synthesized via a self-sacrificing template process. The magnetic field dependence of thermoremanent magnetization and isothermal remanent magnetization shows that the sample is good correspondence to spin glass and diluted antiferromagnetic system for the applied field H < 2 T and H > 2 T, respectively. By detailed analysis of training effect using Binek's model, we argue that the observed exchange bias effect in SrMn3O6−x nanoribbons arises entirely from an interface exchange coupling between the antiferromagnetic core and spin glass shell. The present study is useful for understanding the nature of shell layer and the origin of exchange bias effect in other antiferromagnetic nanosystems as well.

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Section: Resultssupporting

confidence: 79%

Evidence of exchange bias effect originating from the interaction between antiferromagnetic core and spin glass shell

Zhang¹,

Tang²,

Xu³

et al. 2014

Journal of Applied Physics

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“…0) at 50 Oe; the critical exponents, z % 3.18, and the microscopic flipping time of the fluctuating entities, s 0 (¼1/ f 0 Þ $ 10 À11 s. The order of magnitude of s 0 is larger than conventional spin-glasses ($ 10 À13 s) and the value of z obtained is less than the range (4-12) typically found in conventional spin-glasses. 28 The smaller value of z is consistent with those found in LaMn 0:5 Fe 0:5 O 3 (z % 1) 29 and BiFeO 3 (z % 1.38), 30 exhibiting glassy magnetic behavior. We have also analyzed the data using the Vogel-Fulcher…”

Section: Ac Susceptibilitysupporting

confidence: 85%

Orthorhombic distortion and novel magnetic phase separation in Pr0.5Eu0.5MnO3

Karmakar

Majumdar

Giri

2011

Journal of Applied Physics

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Spin dynamics of (Pr0.5-xCex)Ca0.5MnO3 (x=0.05, 0.10, and 0.20) system studied by muon spin relaxation J. Appl. Phys. 112, 073911 (2012); 10.1063/1.4754848Magnetic field-induced metamagnetic transitions of Pr0.5Ca0.5Mn0.97Ga0.03O3Structural and magnetic measurements were done on polycrystalline manganite, Pr 0:5 Eu 0:5 MnO 3 . The Rietveld refinement of the x-ray powder diffraction pattern at room temperature suggests considerable Jahn-Teller distortion due to ionic size mismatch of the isovalent ions. Dc and ac magnetometry suggest a disordered antiferromagnetic (AFM) state, exhibiting glassy magnetic behavior at low temperature. Cooling in a static magnetic field reveals a considerable shift of the magnetic hysteresis loops, a typical manifestation of exchange bias. Interestingly, we observe the absence of training effect in exchange bias. The temperature, cooling field dependent study of exchange bias, and absence of exchange bias in La 0:5 Eu 0:5 MnO 3 suggest a novel low temperature phase separation between a disordered AFM phase induced by the Mn moments and another highly anisotropic phase involving ordering related to the rare-earth moments. It appears that this unique magnetic ground state exhibiting exchange bias is a consequence of the structural distortion inherent in the system.

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“…For the feature around 40 K, we obtained T g≈28 K, zν≈7.12 and τ ≈1.8 × 10 −4 s. For the one around 80 K, corresponding values are: ~80 K, ~2.6 and ~1.6 × 10 −7 s. For a conventional spin glasses2, the zν value falls in the range ~4–13, and τ 0 value ranges between 10 −10 and 10 −13 s. It is clear that the values of τ 0 obtained are in general higher than that for the conventional spin glasses. But the deviation is highly pronounced for the feature around 20–40 K. Judged by these values, one can interpret2223 that the ferrimagnetic regions form clusters exhibiting spin-glass-like inter-cluster dynamics, with the cluster-glass behavior gradually strengthening with decreasing temperature. The parameters derived from isothermal remnant behavior also offers support for cluster-glass behavior, as described earlier.…”

Section: Discussionmentioning

confidence: 92%

A rock-salt-type Li-based oxide, Li3Ni2RuO6, exhibiting a chaotic ferrimagnetism with cluster spin-glass dynamics and thermally frozen charge carriers

Upadhyay

Iyer

Rayaprol

et al. 2016

Sci Rep

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The area of research to discover new Li containing materials and to understand their physical properties has been of constant interest due to applications potential for rechargeable batteries. Here, we present the results of magnetic investigations on a Li compound, Li3Ni2RuO6, which was believed to be a ferrimagnet below 80 K. While our neutron diffraction (ND) and isothermal magnetization (M) data support ferrimagnetism, more detailed magnetic studies establish that this ferrimagnetic phase exhibits some features similar to spin-glasses. In addition, we find another broad magnetic anomaly around 40–55 K in magnetic susceptibility (χ), attributable to cluster spin-glass phenomenon. Gradual dominance of cluster spin-glass dynamics with a decrease of temperature (T) and the apparent spread in freezing temperature suggest that the ferrimagnetism of this compound is a chaotic one. The absence of a unique freezing temperature for a crystalline material is interesting. In addition, pyroelectric current (Ipyro) data reveals a feature in the range 40–50 K, attributable to thermally stimulated depolarization current. We hope this finding motivates future work to explore whether there is any intriguing correlation of such a feature with cluster spin-glass dynamics. We attribute these magnetic and electric dipole anomalies to the crystallographic disorder, intrinsic to this compound.

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Unusual glassy states in LaMn0.5Fe0.5O3: Evidence of two distinct dynamical freezing processes

Cited by 57 publications

References 14 publications

Evidence of exchange bias effect originating from the interaction between antiferromagnetic core and spin glass shell

Evidence of exchange bias effect originating from the interaction between antiferromagnetic core and spin glass shell

Orthorhombic distortion and novel magnetic phase separation in Pr0.5Eu0.5MnO3

A rock-salt-type Li-based oxide, Li3Ni2RuO6, exhibiting a chaotic ferrimagnetism with cluster spin-glass dynamics and thermally frozen charge carriers

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