Magnetic properties of spinel FeCr2S4 in high magnetic field

Ito, Masakazu; Nagi, Yuji; Kado, Naotoshi; Urakawa, Shinpei; Ogawa, Takuro; Kondo, Akihiro; Koyama, K.; Watanabe, Kazuo; Kindo, Koichi

doi:10.1016/j.jmmm.2011.07.041

Cited by 25 publications

(19 citation statements)

References 16 publications

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“…Moreover, recent reports have indicated modifications to the bulk magnetic properties of FeCr 2 S 4 under large applied magnetic fields in this temperature range. [31,40] Neutron diffraction was performed on FeCr 2 S 4 under external applied magnetic fields of up to 7.5 T in order to investigate a potential link between orbital order, the magnetic and crystal structures and external fields. In particular, deviations in the magnetic and crystal structure were studied by performing Rietveld refinement of the lattice and magnetic moment parameters of the Fe 2+ and Cr 3+ -ions.…”

Section: Neutron Diffractionmentioning

confidence: 99%

“…The successful refinement of the FeCr 2 S 4 magnetic structure indicated that the spin-only moments are reduced from expected values of −4.2 µ B for Fe 2+ with S = 2 and g = 2.1 and 3.0 µ B for Cr 3+ with spin S = 3/2 and g = 2. Moreover, recent reports have indicated modifications to the bulk magnetic properties of FeCr 2 S 4 under large applied magnetic fields in this temperature range [31,40].…”

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confidence: 93%

“…[12] The influence of an external magnetic field on the magnetization of FeCr 2 S 4 in the orbitally ordered phase was reported recently and it was proposed that there exists a new magnetic phase for fields larger than 5.5 T, which might be related to the restoration of a commensurate collinear spin structure. [31] Related compounds FeCr 2 O 4 and CoCr 2 O 4 (with orbital degrees of freedom) have been found to be multiferroic, [32,33] and CoCr 2 O 4 exhibits unconventional properties as a function of applied magnetic field. Therefore, we focus in this study on the influence of external magnetic fields on the structural, magnetic, and dielectric properties of FeCr 2 S 4 in the orbitally ordered phase.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Neutron Diffractionmentioning

confidence: 99%

mentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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

Bertinshaw

Ulrich

Günther

et al. 2014

Sci Rep

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“…To date, much effort has been devoted to the experimental and computational study of physical properties of spinel compounds as a function of pressure (Kiefer et al 1997;Nestola et al 2002;Levy et al 2003;Reichmann and Jacobsen 2006), temperature (Askarpour et al 1993;Andreozzi et al 2000;Suzuki et al 2000), and at high magnetic and electric fields (e.g., Hong and Yoo 2006;Ito et al 2011). Nevertheless, there are still many open issues regarding the dependencies of the physical properties of spinels as a function of composition and crystal-chemistry.…”

Section: Introductionmentioning

confidence: 99%

The elasticity of MgAl2O4-MnAl2O4 spinels by Brillouin scattering and an empirical approach for bulk modulus prediction

Bruschini

Speziale

Andreozzi

et al. 2015

American Mineralogist

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The elastic constants C ij of a set of synthetic single crystals belonging to the join MgAl 2 O 4 -MnAl 2 O 4 (spinel sensu stricto-galaxite) were determined by Brillouin spectroscopy at ambient conditions. The C 11 component tends to remain constant for Mg-rich compositions (X Mn < 0.5) and decreases in Mn-rich compositions, whereas C 12 increases and C 44 decreases almost linearly from MgAl 2 O 4 to MnAl 2 O 4 . The bulk modulus K S is weakly dependent upon Mg-Mn substitution within experimental uncertainties, whereas the shear modulus G decreases with increasing Mn 2+ content. For MnAl 2 O 4 , C 11 = 271.3(1.3) GPa, C 12 = 164.8(1.3) GPa, C 44 = 124.9(5) GPa, K S = 200(1) GPa, and G = 88.7(5) GPa.Based on the "polyhedral approach," we developed a model that describes the crystal bulk moduli of the MgAl 2 O 4 -MnAl 2 O 4 spinels in terms of their cation distribution and the polyhedral bulk moduli of the different cations. We refined a set of values for the effective polyhedral bulk modulus of Mg, Mn 2+ , and Al in tetrahedral (T) and octahedral (M) sites, which span from 153 to 270 GPa ranking as follows: Crystal bulk modulus was perfectly reproduced within 0.1% for all Mn 2+ -bearing samples. We also found a high linear correlation between the effective polyhedral bulk modulus and the ionic potential, IP, of the coordinating cations: K i j (GPa) = 20(2) IP + 108(10) (where i indicates the cation and j the polyhedral site). We tested this simple correlation by calculating the specific effective polyhedral bulk modulus of several cations in T and M coordination and then predicting the crystal bulk modulus for several spinel compositions. The success of our simple correlation in modeling the bulk modulus of spinels outside the MgAl 2 O 4 -MnAl 2 O 4 system is encouraging, and suggests that the relationships between chemical composition, cation distribution and elastic properties in spinel-structured minerals and materials can indeed be expressed by relatively simple models.

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“…1. The ZFC, FC2 and FC3 curves are adapted from experimental results [49][50][51][52] and the rest ones, FC1 and FC4, are phenomenological extrapolations. The Néel temperature is T N = 170K.…”

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confidence: 99%

Sequence of superconducting states in field cooled $FeCr_2S_4$

Karchev

2021

Preprint

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In the present article we discuss theoretically the emergence of superconductivity in field cooled F eCr2S4. The chromium electrons form a triplet t2g states and due to antiferromagnetic exchange with the iron spins have Zeeman splitting. Applied, during preparation, magnetic field along the moment of iron ions, successively compensates the Zeeman splittings. The chromium electrons with zero Zeeman energy form Cooper pairs induced by iron magnons. In that way, we predict theoretically the existence of sequence of superconducting states in field cooled F eCr2S4. Actually there are three different superconductors prepared applying, during preparation, different magnetic fields. In these compounds superconductivity coexist with the saturated magnetism of iron ions.

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Magnetic properties of spinel FeCr2S4 in high magnetic field

Cited by 25 publications

References 16 publications

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

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

The elasticity of MgAl2O4-MnAl2O4 spinels by Brillouin scattering and an empirical approach for bulk modulus prediction

Sequence of superconducting states in field cooled $FeCr_2S_4$

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