| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Jeanloz, R.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (6/6 displayed)
- 2016Effects of Fe spin transition on the elasticity of (Mg, Fe) O magnesiowustites and implications for the seismological properties of the Earth's lower mantlecitations
- 2011Intriguing sequence of GaFeO3 structures and electronic states to 70 GPacitations
- 2010High pressure equation of state studies using methanolethanolwater and argon as pressure mediacitations
- 2010Postcotunnite phase of the intermetallic compound AuIn2at high pressurecitations
- 2008Electronic phase transition and amorphization in AuIn2 at high pressurecitations
- 2007Effects of Fe spin transition on the elasticity of (Mg, Fe)O magnesiowüstites and implications for the seismological properties of the Earth's lower mantlecitations
Places of action
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article
Intriguing sequence of GaFeO3 structures and electronic states to 70 GPa
Abstract
<p>Structural studies of the ferrimagnetic (T<sub>N</sub> = 200 K) Mott insulator GaFeO<sub>3</sub> (SG Pc2<sub>1</sub>n) to 70 GPa, complemented by 57Fe Mössbauer spectroscopy and resistance (R) measurements at compression, decompression, and recompression, reveal a fascinating sequence of structures. Starting at ∼25 GPa a new structure, an orthorhombic perovskite (Pv) (SG Pbnm), is sluggishly formed followed by a volume V(P) drop of 5.4%. The complete formation of the Pv occurs at 42 GPa. In the 0-33 GPa range T<sub>N</sub> reaches 300 K and R(P) decreases by one order of magnitude. At 53 GPa an isostructural transition is detected, characterized by a discontinuous drop of V(P) by ∼3%. Mössbauer spectra (MS) reveal a nonmagnetic component coexisting with the magnetic one at ∼60 GPa. Its abundance increases and above 77 GPa no sign of a magnetic hyperfine interaction is detected down to 5 K. Concurrently, one observes a continuous yet precipitous decrease in R(P) taking place in the 53-68 GPa range, leading to an onset of the metallic state at P = 68 GPa. These electronic/magnetic features of the high pressure (HP) Pv are consistent with a Mott transition. With pressure decrease below 50 GPa, the insulating Pv is recovered, and at ∼24 GPa a 1st-order structural transition takes place to a LiNbO<sub>3</sub>-type structure with SG R3c. This structure remains stable down to ambient pressure and with recompression it is stable up to 50 GPa, afterwards it transforms back to the HP Pv structure. It is noteworthy that this transition occurs at the same pressure, regardless of the preceding structures: Pbnm or R3c. The results are compared with hematite (Fe<sub>2</sub>O<sub>3</sub>, SG R3̄c) and other ferric oxides. The mechanisms of the transitions are discussed.</p>