Structural and magnetic properties of FeCr2S4 spinel prepared by field-activated sintering and conventional solid-state synthesis

Zestrea, V.; Kodash, V. Y.; Felea, V.; Petrenco, P.; Quach, Dat V.; Groza, Joanna R.; Tsurkan, V.

doi:10.1007/s10853-007-2168-7

Cited by 14 publications

(13 citation statements)

References 20 publications

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“…As starting materials for SPS, we utilized iron sulfide and chromium sulfide prepared by solid-state synthesis that allowed to avoid oxygen contamination observed when using industrial binary sulfides. 30 X-ray powder analysis of crashed polycrystalline and SPS samples show identical diffraction patterns corresponding to the pure spinel phase without any notable impurities.…”

Section: Methodsmentioning

confidence: 83%

“…For preparation of dense samples suitable for ultrasound and optical studies, we used the spark plasma sintering ͑SPS͒ technique similar to that described in Ref. 30. As starting materials for SPS, we utilized iron sulfide and chromium sulfide prepared by solid-state synthesis that allowed to avoid oxygen contamination observed when using industrial binary sulfides.…”

Section: Methodsmentioning

confidence: 99%

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Structural anomalies and the orbital ground state inFeCr2S4

Tsurkan

Zaharko²,

Schrettle

et al. 2010

Phys. Rev. B

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We report on high-resolution x-ray synchrotron powder-diffraction, magnetic-susceptibility, sound-velocity, thermal-expansion, and heat-capacity studies of the stoichiometric spinel FeCr 2 S 4. We provide clear experimental evidence of a structural anomaly which accompanies an orbital-order transition at low temperatures due to a static cooperative Jahn-Teller effect. At 9 K, magnetic susceptibility, ultrasound velocity, and specific heat reveal pronounced anomalies that correlate with a volume contraction as evidenced by thermal-expansion data. The analysis of the low-temperature heat capacity using a mean-field model with a temperature-dependent gap yields a gap value of about 18 K and is interpreted as the splitting of the electronic ground state of Fe 2+ by a cooperative Jahn-Teller effect. This value is close to the splitting of the ground state due to spin-orbit coupling for isolated Fe 2+ ions in an insulating matrix, indicating that Jahn-Teller and spin-orbit coupling are competing energy scales in this system. We argue that due to this competition, the spin-reorientation transition at around 60 K marks the onset of short-range orbital ordering accompanied by a clear broadening of Bragg reflections, an enhanced volume contraction compared to usual anharmonic behavior, and a softening of the lattice observed in the ultrasound measurements.

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Section: Methodsmentioning

confidence: 83%

Section: Methodsmentioning

confidence: 99%

Structural anomalies and the orbital ground state inFeCr2S4

Tsurkan

Zaharko²,

Schrettle

et al. 2010

Phys. Rev. B

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“…Single crystals of FeCr 2 S 4 show a T 2 dependence in the low temperature lattice-subtracted heat capacity, in stark contrast to a lambda anomaly attributed to orbital ordering in powders [106,107]. Furthermore, it was shown that orbital ordering in powders can be suppressed either by doping ions onto the B site [108] or simply through alternative methods of sample preparation [109]. Both the heat capacity of powder and single crystalline FeCr 2 S 4 are nearly magnetic-field independent, which is not expected for changes in the spin system [106,107].…”

Section: Heat Capacitymentioning

confidence: 99%

Liquidlike correlations in single-crystalline Y2Mo2O7: An unconventional spin glass

et al. 2014

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“…1(c) we show that the temperature-dependent trend in the lattice parameter below T C to T M at 60 K is well described by normal anharmonic lattice dynamics, and was fit accordingly to This Work ND [18] ND [11] XPS [34] Mag. [35] Mag. [21] Mag.…”

Section: Neutron Diffractionmentioning

confidence: 99%

FeCr2S4 in magnetic fields: possible evidence for a multiferroic ground state

Bertinshaw

Ulrich

Günther

et al. 2014

Sci Rep

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We report on neutron diffraction, thermal expansion, magnetostriction, dielectric, and specific heat measurements on polycrystalline FeCr2S4 in external magnetic fields. The ferrimagnetic ordering temperatures TC ≈ 170 K and the transition at TOO ≈ 10 K, which has been associated with orbital ordering, are only weakly shifted in magnetic fields up to 9 T. The cubic lattice parameter is found to decrease when entering the state below TOO. The magnetic moments of the Cr- and Fe-ions are reduced from the spin-only values throughout the magnetically ordered regime, but approach the spin-only values for fields >5.5 T. Thermal expansion in magnetic fields and magnetostriction experiments indicate a contraction of the sample below about 60 K. Below TOO this contraction is followed by a moderate expansion of the sample for fields larger than ~4.5 T. The transition at TOO is accompanied by an anomaly in the dielectric constant. The dielectric constant depends on both the strength and orientation of the external magnetic field with respect to the applied electric field for T < TOO. A linear correlation of the magnetic-field-induced change of the dielectric constant and the magnetic-field dependent magnetization is observed. This behaviour is consistent with the existence of a ferroelectric polarization and a multiferroic ground state below 10 K.

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Structural and magnetic properties of FeCr2S4 spinel prepared by field-activated sintering and conventional solid-state synthesis

Cited by 14 publications

References 20 publications

Structural anomalies and the orbital ground state inFeCr2S4

Structural anomalies and the orbital ground state inFeCr2S4

Liquidlike correlations in single-crystalline Y2Mo2O7: An unconventional spin glass

FeCr2S4 in magnetic fields: possible evidence for a multiferroic ground state

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