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VOLUME 82 (2005) | ISSUE 9 | PAGE 682
Irreversible electronic transition with possible metallization in Y3Fe5O 12 at high pressure
PACS: 64.60.-i, 71.30.+h, 78.20.-e, 81.40.Tv
Abstract
The effect of high pressure up to 70 GPa on the optical absorption spectra in yttrium iron garnet Y3Fe5O12 single crystals was studied in diamond anvil cells. In the pressure range 40\div50 GPa, an electronic transition with drastic decrease of optical gap from \sim2.3 eV to nearly zero value was observed implying possible metallization. Final drop of the optical gap to zero is extrapolated at about 55 GPa. It is shown that the phase transition in yttrium iron garnet observed at 40-55 GPa is possibly a transition of the insulator-metal type. At decompression, back transition to insulating state is not completely reversible. Final spectrum at ambient pressure is essentially different from initial one and corresponds to the optical gap of about 1.8 eV while in the initial state the gap value is \sim2.6 eV.