Colossal magnetoresistance in Cr-based chalcogenide spinels

Ramirez, A. P.; Cava, R. J.; Krajewski, J. J.

doi:10.1038/386156a0

Cited by 458 publications

(285 citation statements)

References 26 publications

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“…This is the case of FeCr 2 S 4 (daubréelite) [36]. This material has attracted attention due to its magnetoresistance effect (MR) reminiscent of the colossal magnetoresistance of manganites [37]. It was found that the local maximum, R max (P) on the R(T) curve, corresponding to the magnetoresistance effect, is substantially reduced and broadened with pressure increase 4 and finally disappears at +7 GPa, the highest pressure of the single, high-spin spinel phase designated as LP1 (Fig.…”

Section: A Case Of a Mott Transition Resulting In A Nonreversible Phamentioning

confidence: 99%

The Mott insulators at extreme conditions; structural consequences of pressure-induced electronic transitions

Rozenberg

Pasternak

2014

Zeitschrift Für Kristallographie – Crystalline Materials

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Electronic/magnetic transitions and their structural consequences in Fe-based Mott insulators in a regime of very high static density are the main issue of this short review paper. The paper focuses on the above-mentioned topics based primarily on our previous and ongoing experimental HP studies employing: (i) diamond anvil cells, (ii) synchrotron X-ray diffraction, (iii) 57 FeMössbauer spectroscopy, (iv) electrical resistance and (v) X-ray absorption spectroscopy. It is shown that applying pressure to such strongly correlated systems leads to a number of changes; including quenching of the orbital moment, quenching of Jahn-Teller distortion, spin crossover, inter-valence charge transfer, insulator-metal transition, moment collapse and volume collapse. These changes may occur simultaneously or sequentially over a range of pressures. Any of these may be accompanied by or be a consequence of a structural phase transition; namely, a change in crystal symmetry. Analyzing this rich variety of phenomena we show the main scenarios which such strongly correlated systems may undergo on the way to a correlation breakdown (Mott transition

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Section: A Case Of a Mott Transition Resulting In A Nonreversible Phamentioning

confidence: 99%

The Mott insulators at extreme conditions; structural consequences of pressure-induced electronic transitions

Rozenberg

Pasternak

2014

Zeitschrift Für Kristallographie – Crystalline Materials

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“…The characteristic of spinel is that some of them have potential of technological applications. Since colossal magnetoresistance ( CMR ) was reported on thiospinel FeCr 2 S 4 and its derivatives [1,2], studies on FeCr 2 S 4 are actively carried out. FeCr 2 S 4 has a cubic spinel structure with a symmetry of F d3m.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties of spinel FeCr2S4 in high magnetic field

Ito

Nagi

Kado

et al. 2011

Journal of Magnetism and Magnetic Materials

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We studied temperature and magnetic field dependence of magnetization, M(T ) and M(B), on thiospinel FeCr 2 S 4 . We observed a step-like anomaly at T OO ∼ 9 K for M(T ) attributed to an orbital order transition in magnetic field 0 < B ≤ 7 T. Furthermore, also for M(B), an step-like anomaly appears at B c ∼ 5.5 T below T OO . This suggests an existence of a magnetic phase boundary at B c in T < T OO . Because the anomaly at B c of M(B) exists in the orbital ordered phase, the spin structure of FeCr 2 S 4 in T < T OO is strongly coupled with the lattice of the system.

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“…Similar CMR effects have been observed in other groups of materials including thiospinel such as FeCr 2 S 4 . [3] It is interesting to notice that large negative MR with no magnetic phase transition has been reported in some magnetic semiconductors such as Gd 3-x S 4 [4] and amorphous Gd-Si. [5,6] In these materials, the resistance increases exponentially with decreasing temperature according to variable range hopping (VRH) [7] at low temperatures.…”

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confidence: 99%