Observation of reentrant spin glass behavior in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>LaCo</mml:mtext></mml:mrow><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Ni</mml:mtext></mml:mrow><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mtext>O</mml:mtext><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

Viswanathan, Malini; Kumar, P. S. Anil

doi:10.1103/physrevb.80.012410

Cited by 74 publications

(49 citation statements)

References 15 publications

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“…The linear ac susceptibility (χ Fig. 1(b)) reveals the frequency dispersion of the signal more distinctly, albeit at a lower temperature of around 160 K. It is rather a common feature that the peak in χ ′′ 1 appears at a lower temperature than the same in the χ ′ 1 , and has been observed in many well-known systems [18][19][20] , but the temperature difference here (≈ 30 K) seems to be unusually large. However, even such behavior has been observed earlier 21 , especially in systems with coexisting ferromagnetic and spin-glass features, appearing from the grains and the disordered grain boundaries, respectively 22 .…”

Section: Resultsmentioning

confidence: 96%

Origin of the unconventional magnetoresistance in Sr ₂ FeMoO ₆

Ray

Middey

Jana

et al. 2011

EPL

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The unusual magnetoresistance (M R) behavior in Sr 2 FeMoO 6 , recently termed as spin-valve type MR (SVMR), presents several anomalies that are little understood so far. The difficulty in probing the origin of this phenomenon, arising from the magnetic property of only a small volume fraction of the ferromagnetic bulk, is circumvented in the present study by the use of ac susceptibility measurements that are sensitive to the slope rather than the magnitude of the magnetization. The present study unravels a spin-glass (SG) like surface layer around each soft ferromagnetic (FM) grain of Sr 2 FeMoO 6 . It is also observed that there is a very strong exchange coupling between the two, generating 'exchange bias' effect, which consequently creates the 'valve', responsible for the unusual M R effects.

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Section: Resultsmentioning

confidence: 96%

Origin of the unconventional magnetoresistance in Sr ₂ FeMoO ₆

Ray

Middey

Jana

et al. 2011

EPL

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“…Moreover, magnetization and neutron diffraction studies observed the presence of spin glass and long-range ordered ferromagnetic correlation at low temperatures [14,[43][44][45][46]. However, a recent study on highly metelllic LaNiO 3 single crystals by Li et al revealed antiferromagnetic ordering in magnetization, specific heat and neutron scattering experiments [49], which is in contrast with another report in [50].…”

Section: Introductionmentioning

confidence: 90%

Anomalous magnetic and spin glass behavior in Nb-substituted LaCo1−xNbxO3

Shukla

Dhaka

2018

Phys. Rev. B

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We report the structural, magnetic, transport and electronic properties of Nb substituted LaCo1−xNbxO3 (x = 0-0.2). The Rietveld analysis of x-ray diffraction data demonstrate structural phase transitions from rhombohedral to orthorhombic and further to monoclinic with increasing the Nb concentration up to x ≥ 0.2. Interestingly, we observed dramatic changes in the magnetization (M) with increasing the Nb concentration, as the M sharply increases below 10 K even at 2.5% substitution. Furthermore, ac susceptibility data show the spin-glass behavior in x = 0.1 sample. We find that the density of states near the Fermi level decreases and the activation energy increases, which results in the decreasing conductivity with higher Nb concentration. A significant shift in the peak position of A2g phonon mode has been observed using Raman spectroscopy, which indicates the change in the coupling due to the structural distortion with Nb substitution. The core-level photoemission study confirms that the Nb is present in 5+ valence state. Our study reveals that the nonmagnetic Nb 5+ (d 0 ) substitution converts Co 3+ ions to Co 2+ and stabilize both in the high-spin state. Our results suggest that structural and spin-state transitions as well as the difference in the ionic radii between Nb 5+ and Co 3+ are playing an important role in tuning the physical properties.

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“…These so-called reentrant spin-glass (RSG) systems undergo a magnetic ordering transition and have a spin freezing transition at a lower temperature. 14 Recently, the observation of slow dynamics resembling (R)SG is also extended to metallic alloys, [15][16][17] showing first-order magneto-structural transition.…”

Section: Introductionmentioning

confidence: 99%

Reentrant spin-glass behavior induced by the frustration of Fe-Fe interactions in Laves phase Nb1−xHfxFe2 alloys

Gao

Nishimura

Namiki

et al. 2012

Journal of Applied Physics

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We carried out magnetization and specific-heat measurements of metallic compounds Nb 1-x Hf x Fe 2 (x = 0 and 0.65), which exhibit reentrant spin-glass freezing. The frequency dependence of ac susceptibility and the bifurcation between zero-field-cooled and field-cooled magnetization curves suggest the complex coexistence of magnetic phases at low temperatures.A long-time relaxation of magnetization is possibly due to the cluster-type and traditional reentrant spin-glass transition, which may be induced by the frustration of long-range Fe-Fe interactions. We did not observe any discontinuity indicating long-range magnetic phase transition in the data of specific heat vs temperature, but a broad hump characteristic of spin-glass freezing. The difference between the behaviors of two samples proves the existence of two types of reentrant spin-glass in alloys. The moment arrangements are briefly discussed.

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Observation of reentrant spin glass behavior inLaCo0.5Ni0.5O3

Cited by 74 publications

References 15 publications

Origin of the unconventional magnetoresistance in Sr ₂ FeMoO ₆

Origin of the unconventional magnetoresistance in Sr ₂ FeMoO ₆

Anomalous magnetic and spin glass behavior in Nb-substituted LaCo1−xNbxO3

Reentrant spin-glass behavior induced by the frustration of Fe-Fe interactions in Laves phase Nb1−xHfxFe2 alloys

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Observation of reentrant spin glass behavior inLaCo0.5Ni0.5O3

Cited by 74 publications

References 15 publications

Origin of the unconventional magnetoresistance in Sr 2 FeMoO 6

Origin of the unconventional magnetoresistance in Sr 2 FeMoO 6

Anomalous magnetic and spin glass behavior in Nb-substituted LaCo1−xNbxO3

Reentrant spin-glass behavior induced by the frustration of Fe-Fe interactions in Laves phase Nb1−xHfxFe2 alloys

Contact Info

Product

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Origin of the unconventional magnetoresistance in Sr ₂ FeMoO ₆

Origin of the unconventional magnetoresistance in Sr ₂ FeMoO ₆