期刊
PHYSICAL REVIEW LETTERS
卷 116, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.116.216401
关键词
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资金
- Michigan State University
- NSF [DMR-1205469]
- Scientific User Facilities Division, Office of Basic Energy Sciences, DOE
- National Natural Science Foundation of China [11204326, 11474296]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1205469] Funding Source: National Science Foundation
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 Ca3Ru2O7. 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.
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