Magnetically induced electric field gradient in tetrahedral divalent iron: FeCr2S4

Eibschütz, M.; Shtrikman, S.; Tenenbaum, Y.

doi:10.1016/0375-9601(67)90615-9

Cited by 68 publications

(21 citation statements)

References 2 publications

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“…2 Temperature dependence of hyperfine magnetic field B hf field gradient appears which is increasing with increasing magnetic hyperfine field as already described earlier [3]. The observation of a quadrupole interaction at iron below the Curie temperature despite neutron data prove cubic structure has been discussed controversially [1,2,[5][6][7][8][9][10][11]. As first proposed by [2] this quadrupole interaction can be related to a magnetically induced electric field gradient.…”

Section: Resultsmentioning

confidence: 64%

“…The observation of a quadrupole interaction at iron below the Curie temperature despite neutron data prove cubic structure has been discussed controversially [1,2,[5][6][7][8][9][10][11]. As first proposed by [2] this quadrupole interaction can be related to a magnetically induced electric field gradient. This may occur for the electronic ground state (E) of Fe 2+ in tetrahedral crystalline electric field for certain orientations of the locally acting molecular magnetic field.…”

Section: Resultsmentioning

confidence: 93%

“…The thiospinel FeCr 2 S 4 has been studied since very early days of Mössbauer spectroscopy [1][2][3]. Magnetic order has been found below about 160 K [4].…”

Section: Introductionmentioning

confidence: 99%

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Spin re-orientation in FeCr2S4

et al. 2011

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The spinel FeCr 2 S 4 has been studied intensely for its peculiar magnetic and local structural changes which are sensitively influenced by the Jahn-Teller properties of Fe 2+ in tetrahedral sulfur coordination. Recent muon spin rotation data give strong evidence that the commonly assumed collinear magnetic structure of this compound is only found between the Curie temperature T C = 165 K and 50 K. For lower temperatures a helical structure has been proposed. We present new Mössbauer spectroscopic data taken on the same sample as used for muon spin rotation. Also the hyperfine spectra revealing non-equivalent iron sites support the appearance of a spin re-orientation around 50 K which may be related to the onset of short-range orbital order. Below 20 K severe dynamic broadenings are found which may indicate orbital fluctuations. Orbital order occurs around 11 K accompanied by severe changes in the crystalline electric field ground state as traced from quadrupole interaction. LACAME 2010, Lima J. Engelke · F. J. Litterst (B) Inst. Physik der Kondensierten Materie,

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Section: Resultsmentioning

confidence: 64%

Section: Resultsmentioning

confidence: 93%

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Spin re-orientation in FeCr2S4

et al. 2011

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“…Mo È ssbauer spectra of ferrites have been reported by a number of authors [3,4,5,6]. However, many of them are complex spectra of ferrous ions from which it is very difficult to extract information on superexchange interactions, for the magnetic hyperfine field of a ferrous ion is not proportional [7] to the ionic spin owing to the orbital contribution, and the electric field gradient due to the electrons of ferrous ions is usually quite large.…”

Section: Introductionmentioning

confidence: 99%

M�ssbauer Studies of Superexchange Interaction in Tetragonal CuFe2O4

Oak

Baek

Kim

1998

phys. stat. sol. (b)

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CuFe 2 O 4 has been studied by Mo È ssbauer spectroscopy and X-ray diffraction. The crystal is found to have a tetragonal spinel structure with the lattice constants a 0 (5.805 AE 0.005) # e and c 0 (8.669 AE 0.005) # e. The iron ions are in ferric Fe 3 states. The temperature dependence of the magnetic hyperfine fields at 57 Fe nuclei at the tetrahedral (A) and octahedral (B) sites is analyzed by the Ne Â el theory of ferrimagnetism. The intersublattice superexchange interaction is found to be antiferromagnetic with its strength of J AÀB À19X5k B while intrasublattice superexchange interactions are ferromagnetic with their strengths of J AÀA 3X1k B and J BÀB 4X4k B .

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“…i) At all temperatures neither the sextets nor the singlet exhibit a quadrupole splitting; Fe II in a tetrahedral site would be split below T C . [16] ii) The isomer shifts are small (the ordering is d Fe…”

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confidence: 99%