Report
Evidence for a correlated insulator to antiferromagnetic metal transition in CrN
| العنوان: | Evidence for a correlated insulator to antiferromagnetic metal transition in CrN |
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| المؤلفون: | 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. |
| المصدر: | Phys. Rev. Lett 104, 236404 (2010) |
| سنة النشر: | 2010 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons |
| الوصف: | We investigate the electronic structure of Chromium Nitride (CrN) across the first-order magneto-structural transition at T_N ~ 286 K. Resonant photoemission spectroscopy shows a gap in the 3d partial density of states at the Fermi level and an On-site Coulomb energy U ~ 4.5 eV, indicating strong electron-electron correlations. Bulk-sensitive high resolution (6 meV) laser photoemission reveals a clear Fermi edge indicating an antiferromagnetic metal below T_N. Hard x-ray Cr 2p core-level spectra show T-dependent changes across T_N which originate from screening due to coherent states as substantiated by cluster model calculations using the experimentally observed U. The electrical resistivity confirms an insulator above T_N (E_g ~ 70 meV) which becomes a disordered metal below T_N. The results indicate CrN transforms from a correlated insulator to an antiferromagnetic metal, coupled to the magneto-structural transition. Comment: Submitted to Physical Review Letters (February 2010) 11 pages, 3 figures in the main text, 1 Supplementary Information |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.104.236404 |
| URL الوصول: | http://arxiv.org/abs/1004.0042 |
| رقم الانضمام: | edsarx.1004.0042 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevLett.104.236404 |
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