Colossal magnetoresistance in a Mott insulator via magnetic field-driven insulator-metal transition
| Autor: | Zhu, M., Peng, J., Zou, T., Prokes, K., Mahanti, S. D., Hong, T., Mao, Z. Q., Liu, G. Q., Ke, X. |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 116, 216401 (2016) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.116.216401 |
| Popis: | We present a new type of colossal magnetoresistance (CMR) arising from an anomalous collapse of the Mott insulating state via a modest magnetic field in a bilayer ruthenate, Ti-doped Ca$_3$Ru$_2$O$_7$. Such an insulator-metal transition is accompanied by changes in both lattice and magnetic structures. Our findings have important implications because a magnetic field usually stabilizes the insulating ground state in a Mott-Hubbard system, thus calling for a deeper theoretical study to reexamine the magnetic field tuning of Mott systems with magnetic and electronic instabilities and spin-lattice-charge coupling. This study further provides a model approach to search for CMR systems other than manganites, such as Mott insulators in the vicinity of the boundary between competing phases. Comment: 10 pages, 4 figures |
| Databáze: | arXiv |
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