Multiferroicity and colossal magneto-capacitance in Cr-thiospinels

Lunkenheimer, P.; Fichtl, R.; Weber, S.; Tsurkan, V.; Loidl, A.

doi:10.1080/01411590601067193

Cited by 30 publications

(25 citation statements)

References 41 publications

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“…The as-prepared CdCr 2 S 4 and Cd 0.97 In 0.03 Cr 2 S 4 have similar magnitudes of e 0 and r 0 as the CdCr 2 S 4 polycrystalline sample reported in Ref. 8. Both e 0 and r 0 increase with temperature monotonously and do not show anomaly and magnetic field dependence in the whole measured temperature range, as seen from Figs.…”

supporting

confidence: 81%

“…Annealing single crystal samples in vacuum or sulphur atmosphere led to a suppression of relaxation features and no remanent electric polarization could be found at low temperatures. 8 Moreover, multiferroicity and CMC effect are absent in undoped polycrystalline samples, but present in indium doped polycrystallines. 8 Accordingly, whether the magnetoelectric effect in CdCr 2 S 4 is intrinsic or not has been raised.…”

mentioning

confidence: 99%

“…8 Moreover, multiferroicity and CMC effect are absent in undoped polycrystalline samples, but present in indium doped polycrystallines. 8 Accordingly, whether the magnetoelectric effect in CdCr 2 S 4 is intrinsic or not has been raised. [9][10][11] Based on first principles calculations, Fennie and Rabe suggested that the anomalous dielectric response in CdCr 2 S 4 might be extrinsic since this material shows no phonon softening at any temperature.…”

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confidence: 99%

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Annealing induced colossal magnetocapacitance and colossal magnetoresistance in In-doped CdCr2S4

Xie

Yang

et al. 2012

Journal of Applied Physics

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The correlation between colossal magnetocapacitance (CMC) and colossal magnetoresistance (CMR) in CdCr 2 S 4 system has been revealed. The CMC is induced in polycrystalline Cd 0.97 In 0.03 Cr 2 S 4 by annealing in cadmium vapor. At the same time, an insulator-metal transition and a concomitant CMR are observed near the Curie temperature. In contrast, after the same annealing treatment, CdCr 2 S 4 displays a typical semiconductor behavior and does not show magnetic field dependent dielectric and electric transport properties. The simultaneous occurrence or absence of CMC and CMR effects implies that the CMC in the annealed Cd 0.97 In 0.03 Cr 2 S 4 could be explained qualitatively by a combination of CMR and Maxwell-Wagner effect.

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supporting

confidence: 81%

mentioning

confidence: 99%

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confidence: 99%

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Annealing induced colossal magnetocapacitance and colossal magnetoresistance in In-doped CdCr2S4

Xie

Yang

et al. 2012

Journal of Applied Physics

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“…2 and 3 correspond to the expected anharmonic temperature dependence of frequencies and dampings as calculated according to Eqs. (13) and (14). These curves have been derived by fitting the high-temperature (T > 150 K) values of the eigenfrequencies and dampings.…”

Section: Resultsmentioning

confidence: 99%

“…14,15 The observation that marginal doping with charge carriers induces dipolar relaxation phenomena reminds of similar effects in transition-metal monoxides doped on a subpercent level with Li (Ref. 16) or on metal deficient semiconducting NiO.…”

Section: Introductionmentioning

confidence: 99%

Polar phonons and spin-phonon coupling inHgCr2S4andCdC

et al. 2007

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Polar phonons of HgCr2S4 and CdCr2S4 are studied by far-infrared spectroscopy as a function of temperature and external magnetic field. Eigenfrequencies, damping constants, effective plasma frequencies and Lyddane-Sachs-Teller relations, and effective charges are determined. Ferromagnetic CdCr2S4 and antiferromagnetic HgCr2S4 behave rather similar. Both compounds are dominated by ferromagnetic exchange and although HgCr2S4 is an antiferromagnet, no phonon splitting can be observed at the magnetic phase transition. Temperature and magnetic field dependence of the eigenfrequencies show no anomalies indicating displacive polar soft mode behavior. However, significant effects are detected in the temperature dependence of the plasma frequencies indicating changes in the nature of the bonds and significant charge transfer. In HgCr2S4 we provide experimental evidence that the magnetic field dependence of specific polar modes reveal shifts exactly correlated with the magnetization showing significant magneto-dielectric effects even at infrared frequencies.

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