| Conţinutul numărului revistei |
| Articolul precedent |
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 235 0 |
 SM ISO690:2012EFTHIMIOPOULOS, Ilias, YARESKO, Alexander Ya, TSURKAN, Vladimir, DEISENHOFER, Joachim, LOIDL, Alois, PARK, Changyong, WANG, Yuejian. Pressurizing the HgCr2Se4 spinel at room temperature. In: Applied Physics Letters, 2014, vol. 104, pp. 1-6. ISSN 0003-6951. DOI: https://doi.org/10.1063/1.4861591 |
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  Applied Physics Letters |
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| Volumul 104 / 2014 / ISSN 0003-6951 /ISSNe 1077-3118 | |
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| DOI:https://doi.org/10.1063/1.4861591 | |
| Pag. 1-6 | |
| Rezumat | |
The cubic HgCr2Se4 spinel undergoes two structural transitions upon pressure increase. Initially, the ambient-pressure Fd-3m phase transforms into a tetragonal I41/amd structure above 15 GPa. We speculate that this Fd-3m-I41/amd transition is accompanied by an insulator-to-metal transition, resulting in the vanishing of the Raman signal after the structural transformation. Further compression of HgCr 2Se4 leads to structural disorder beyond 21 GPa. Our spin-resolved band structure calculations reveal significant changes in the electronic structure of HgCr2Se4 after the Fd-3m-I4 1/amd transition, whereas the ferromagnetic interactions are found to dominate in both structures. |
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| Cuvinte-cheie Band structure calculation, Ferro-magnetic interactions, Insulator-to-metal transitions, Pressure increase, Room temperature, Structural disorders, Structural transformation, Structural transitions |
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