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Li H, Ge Z, Sun A, Zhu Z, Tian Y, Lv S. Ferrimagnetic semiconductor of CaCu3Fe2V2O12 with direct bandgap. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Brière B, Kalinko A, Yamada I, Roy P, Brubach JB, Sopracase R, Zaghrioui M, Phuoc VT. On the energy scale involved in the metal to insulator transition of quadruple perovskite EuCu3Fe4O12: infrared spectroscopy and ab-initio calculations. Sci Rep 2016; 6:28624. [PMID: 27346212 PMCID: PMC4922022 DOI: 10.1038/srep28624] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Accepted: 06/03/2016] [Indexed: 11/24/2022] Open
Abstract
Optical measurements were carried out by infrared spectroscopy on AA′3B4O12 A-site ordered quadruple perovskite EuCu3Fe4O12 (microscopic sample) as function of temperature. At 240 K (=TMI), EuCu3Fe4O12 undergoes a very abrupt metal to insulator transition, a paramagnetic to antiferromagnetic transition and an isostructural transformation with an abrupt large volume expansion. Above TMI, optical conductivity reveals a bad metal behavior and below TMI, an insulating phase with an optical gap of 125 meV is observed. As temperature is decreased, a large and abrupt spectral weight transfer toward an energy scale larger than 1 eV is detected. Concurrently, electronic structure calculations for both high and low temperature phases were compared to the optical conductivity results giving a precise pattern of the transition. Density of states and computed optical conductivity analysis identified Cu3dxy, Fe3d and O2p orbitals as principal actors of the spectral weight transfer. The present work constitutes a first step to shed light on EuCu3Fe4O12 electronic properties with optical measurements and ab-initio calculations.
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Affiliation(s)
- B Brière
- GREMAN, CNRS UMR 7347-CEA, Université F. Rabelais, UFR Sciences, Parc de Grandmont, Tours, 37200, France
| | - A Kalinko
- Synchrotron Soleil, Université Paris-Saclay, L'Orme des Merisiers, 91190 Saint-Aubin, France
| | - I Yamada
- Nanoscience and Nanotechnology Research Center, Osaka Prefecture University, Sakai, Osaka Japan
| | - P Roy
- Synchrotron Soleil, Université Paris-Saclay, L'Orme des Merisiers, 91190 Saint-Aubin, France
| | - J B Brubach
- Synchrotron Soleil, Université Paris-Saclay, L'Orme des Merisiers, 91190 Saint-Aubin, France
| | - R Sopracase
- GREMAN, CNRS UMR 7347-CEA, Université F. Rabelais, UFR Sciences, Parc de Grandmont, Tours, 37200, France
| | - M Zaghrioui
- GREMAN, CNRS UMR 7347-CEA, Université F. Rabelais, UFR Sciences, Parc de Grandmont, Tours, 37200, France
| | - V Ta Phuoc
- GREMAN, CNRS UMR 7347-CEA, Université F. Rabelais, UFR Sciences, Parc de Grandmont, Tours, 37200, France
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Dan S, Mukherjee S, Mazumdar C, Ranganathan R. Zero thermal expansion with high Curie temperature in Ho2Fe16Cr alloy. RSC Adv 2016. [DOI: 10.1039/c6ra20216k] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Ho2Fe16Cr with a high TC and moderate coercivity behaves like a zero thermal expansion material in the temperature range 13–330 K.
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Affiliation(s)
- Shovan Dan
- Department of Physics
- The University of Burdwan
- Burdwan-713104
- India
| | - S. Mukherjee
- Department of Physics
- The University of Burdwan
- Burdwan-713104
- India
| | - Chandan Mazumdar
- Condensed Matter Physics Division
- Saha Institute of Nuclear Physics
- Kolkata-700064
- India
| | - R. Ranganathan
- Condensed Matter Physics Division
- Saha Institute of Nuclear Physics
- Kolkata-700064
- India
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