High pressure electrical resistivity of HgCr2Se4

Kistaiah, P.; Murthy, K. P. N.; Rao, K. V. S. Rama

doi:10.1016/0022-5088(84)90291-1

Cited by 10 publications

(12 citation statements)

References 6 publications

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“…A simple extrapolation of the existing curves yields zero E g values either at 80 GPa (dE g /dP = -0.0165 eV/GPa, AFM1) or 57 GPa (dE g /dP = -0.032 eV/GPa, AFM2). This electronic behavior is rather different compared to other Cr-spinels, where pressure-induced insulator-metal transitions at lower pressures are reported 18,21,24,25 .…”

Section: Figmentioning

confidence: 69%

“…The straightforward effect of compression is the reduction of the Cr-Cr distances, which in turn causes the enhancement of the AFM J 1 interactions over the FM J 2 ones. Besides from tuning the magnetic interactions, pressure can also lead to structural [18][19][20][21][22][23] , electronic 21,24,25 , and even magnetic 21 27 . A red-shift of E g was detected below T C 27 , but without any apparent complementary structural effect 5,28 .…”

Section: Introductionmentioning

confidence: 99%

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Pressure-induced phase transitions in the CdCr2Se4 spinel

et al. 2016

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We have conducted high-pressure x-ray diffraction and Raman spectroscopic studies on the CdCr 2 Se 4 spinel at room temperature up to 42 GPa. We have resolved three structural transitions up to 42 GPa, i.e. the starting Fd3 m phase transforms at ~11 GPa into a tetragonal I4 1 /amd structure, an orthorhombic distortion was observed at ~15 GPa, whereas structural disorder initiates beyond 25 GPa. Our ab initio DFT studies successfully reproduced the observed crystalline-to-crystalline structural transitions. In addition, our calculations propose an anti-ferromagnetic ordering as a potential magnetic ground state for the high-pressure tetragonal and orthorhombic modifications, as compared to the starting ferromagnetic phase. Furthermore, the computational results indicate that all phases remain insulating in their stability pressure range, with a direct-to-indirect band gap transition for the Fd3 m phase taking place at 5 GPa.We attempted also to offer an explanation behind the peculiar first-order character of the Fd3 m (cubic)→I4 1 /amd (tetragonal) transition observed for several relevant Cr-spinels, i.e. the sizeable volume change at the transition point, which is not expected from space group symmetry considerations. We detected a clear correlation between the cubic-tetragonal transition pressures and the next-nearest-neighbor magnetic exchange interactions for the Crbearing sulphide and selenide members, a strong indication that the cubic-tetragonal transitions in these systems are principally governed by magnetic effects.

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Section: Figmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Pressure-induced phase transitions in the CdCr2Se4 spinel

et al. 2016

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“…20,23 Given this close interrelation between structural, vibrational, magnetic, and charge degrees of freedom, the variation of lattice by external pressure provides an appealing method for tuning the physical properties of these materials. Actually, several studies report structural [24][25][26] and electronic [26][27][28] transitions under pressure for various Cr-based spinels.…”

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confidence: 99%

Multiple pressure-induced transitions in HgCr₂S₄

Efthimiopoulos¹,

Yaresko²,

Tsurkan³

et al. 2013

Appl. Phys. Lett.

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“…In certain cases, electronic changes, e.g. insulator-to-metal [13][14][15][16] or semiconductor-to-semiconductor 17 transitions have been reported. On the other hand, the magnetic interactions of the oxide spinels with magnetic A 2+ cations are more complex, since one needs to consider also the A 2+ -Cr 3+ and the more distant A 2+ -A 2+ magnetic exchange interactions 2,4,18 .…”

Section: Introductionmentioning

confidence: 99%

Universal link of magnetic exchange and structural behavior under pressure in chromium spinels

et al. 2018

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We have conducted high-pressure X-ray diffraction studies on the MnCr 2 O 4 and NiCr 2 O 4 spinels at room temperature. Both compounds undergo pressure-induced structural transitions into diverse tetragonal modifications. Based on these experimental observations and our ab initio calculations, we show that the Cr-oxide spinels with magnetic A 2+ cations (A 2+ = Mn, Fe, Co, Ni) follow a similar trend as their chalcogenide counterparts with non-magnetic A 2+ ions, i.e. the transition pressure is proportionally related with the magnitude of the Cr-Cr magnetic exchange interactions. Therefore, we reach the conclusion that the Cr-Cr magnetic exchange interactions alone suffice to account for the high-pressure behavior of these systems. Our results clearly depict the close relationship between the structural and magnetic degrees of freedom in Cr-bearing spinels.

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High pressure electrical resistivity of HgCr2Se4

Cited by 10 publications

References 6 publications

Pressure-induced phase transitions in the CdCr2Se4 spinel

Pressure-induced phase transitions in the CdCr2Se4 spinel

Multiple pressure-induced transitions in HgCr₂S₄

Universal link of magnetic exchange and structural behavior under pressure in chromium spinels

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High pressure electrical resistivity of HgCr2Se4

Cited by 10 publications

References 6 publications

Pressure-induced phase transitions in the CdCr2Se4 spinel

Pressure-induced phase transitions in the CdCr2Se4 spinel

Multiple pressure-induced transitions in HgCr2S4

Universal link of magnetic exchange and structural behavior under pressure in chromium spinels

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Product

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Multiple pressure-induced transitions in HgCr₂S₄