Evidence for a correlated insulator to antiferromagnetic metal transition in CrN

P. A. Bhobe; A. Chainani; M. Taguchi; T. Takeuchi; R. Eguchi; M. Matsunami; K. Ishizaka; Y. Takata; M. Oura; Y. Senba; H. Ohashi; Y. Nishino; M. Yabashi; K. Tamasaku; T. Ishikawa; K. Takenaka; H. Takagi; S. Shin

doi:10.1103/PhysRevLett.104.236404

Evidence for a correlated insulator to antiferromagnetic metal transition in CrN

P. A. Bhobe, A. Chainani, M. Taguchi, T. Takeuchi, R. Eguchi, M. Matsunami, K. Ishizaka, Y. Takata, M. Oura, Y. Senba, H. Ohashi, Y. Nishino, M. Yabashi, K. Tamasaku, T. Ishikawa, K. Takenaka, H. Takagi, S. Shin

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Abstract

We investigate the electronic structure of chromium nitride (CrN) across the first-order magnetostructural transition at TN∼286K. Resonant photoemission spectroscopy (PES) shows a gap in the 3d partial density of states at the Fermi level and an on-site Coulomb energy U∼4.5eV, indicating strong electron-electron correlations. Bulk-sensitive high-resolution (6 meV) laser PES reveals a clear Fermi edge indicating an antiferromagnetic metal below TN. Hard x-ray Cr 2p core-level PES shows T-dependent changes across TN which originate from screening due to coherent states as substantiated by cluster model calculations using the experimentally observed U. Electrical resistivity confirms an insulator above TN (Eg∼70meV) becoming a disordered metal below TN. Thus, CrN transforms from a correlated insulator to an antiferromagnetic metal, coupled to the magnetostructural transition.

Original language	English
Article number	236404
Journal	Physical Review Letters
Volume	104
Issue number	23
DOIs	https://doi.org/10.1103/PhysRevLett.104.236404
Publication status	Published - Jun 11 2010
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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Bhobe, P. A., Chainani, A., Taguchi, M., Takeuchi, T., Eguchi, R., Matsunami, M., Ishizaka, K., Takata, Y., Oura, M., Senba, Y., Ohashi, H., Nishino, Y., Yabashi, M., Tamasaku, K., Ishikawa, T., Takenaka, K., Takagi, H., & Shin, S. (2010). Evidence for a correlated insulator to antiferromagnetic metal transition in CrN. Physical Review Letters, 104(23), [236404]. https://doi.org/10.1103/PhysRevLett.104.236404

Bhobe, PA, Chainani, A, Taguchi, M, Takeuchi, T, Eguchi, R, Matsunami, M, Ishizaka, K, Takata, Y, Oura, M, Senba, Y, Ohashi, H, Nishino, Y, Yabashi, M, Tamasaku, K, Ishikawa, T, Takenaka, K, Takagi, H & Shin, S 2010, 'Evidence for a correlated insulator to antiferromagnetic metal transition in CrN', Physical Review Letters, vol. 104, no. 23, 236404. https://doi.org/10.1103/PhysRevLett.104.236404

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abstract = "We investigate the electronic structure of chromium nitride (CrN) across the first-order magnetostructural transition at TN∼286K. Resonant photoemission spectroscopy (PES) shows a gap in the 3d partial density of states at the Fermi level and an on-site Coulomb energy U∼4.5eV, indicating strong electron-electron correlations. Bulk-sensitive high-resolution (6 meV) laser PES reveals a clear Fermi edge indicating an antiferromagnetic metal below TN. Hard x-ray Cr 2p core-level PES shows T-dependent changes across TN which originate from screening due to coherent states as substantiated by cluster model calculations using the experimentally observed U. Electrical resistivity confirms an insulator above TN (Eg∼70meV) becoming a disordered metal below TN. Thus, CrN transforms from a correlated insulator to an antiferromagnetic metal, coupled to the magnetostructural transition.",

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AU - Bhobe, P. A.

AU - Chainani, A.

AU - Taguchi, M.

AU - Takeuchi, T.

AU - Eguchi, R.

AU - Matsunami, M.

AU - Ishizaka, K.

AU - Takata, Y.

AU - Oura, M.

AU - Senba, Y.

AU - Ohashi, H.

AU - Nishino, Y.

AU - Yabashi, M.

AU - Tamasaku, K.

AU - Ishikawa, T.

AU - Takenaka, K.

AU - Takagi, H.

AU - Shin, S.

PY - 2010/6/11

Y1 - 2010/6/11

N2 - We investigate the electronic structure of chromium nitride (CrN) across the first-order magnetostructural transition at TN∼286K. Resonant photoemission spectroscopy (PES) shows a gap in the 3d partial density of states at the Fermi level and an on-site Coulomb energy U∼4.5eV, indicating strong electron-electron correlations. Bulk-sensitive high-resolution (6 meV) laser PES reveals a clear Fermi edge indicating an antiferromagnetic metal below TN. Hard x-ray Cr 2p core-level PES shows T-dependent changes across TN which originate from screening due to coherent states as substantiated by cluster model calculations using the experimentally observed U. Electrical resistivity confirms an insulator above TN (Eg∼70meV) becoming a disordered metal below TN. Thus, CrN transforms from a correlated insulator to an antiferromagnetic metal, coupled to the magnetostructural transition.

AB - We investigate the electronic structure of chromium nitride (CrN) across the first-order magnetostructural transition at TN∼286K. Resonant photoemission spectroscopy (PES) shows a gap in the 3d partial density of states at the Fermi level and an on-site Coulomb energy U∼4.5eV, indicating strong electron-electron correlations. Bulk-sensitive high-resolution (6 meV) laser PES reveals a clear Fermi edge indicating an antiferromagnetic metal below TN. Hard x-ray Cr 2p core-level PES shows T-dependent changes across TN which originate from screening due to coherent states as substantiated by cluster model calculations using the experimentally observed U. Electrical resistivity confirms an insulator above TN (Eg∼70meV) becoming a disordered metal below TN. Thus, CrN transforms from a correlated insulator to an antiferromagnetic metal, coupled to the magnetostructural transition.

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Evidence for a correlated insulator to antiferromagnetic metal transition in CrN

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