Abstract
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.
| Original language | English |
|---|---|
| Article number | 216401 |
| Journal | Physical Review Letters |
| Volume | 116 |
| Issue number | 21 |
| DOIs | |
| State | Published - May 25 2016 |
Funding
X.K. is grateful for Dr. Matas in HZB for help during the neutron experiment. X.K. acknowledges the start-up funds from Michigan State University. Work at Tulane University was supported by the NSF under Grant No.DMR-1205469 and work at ORNL was supported by the Scientific User Facilities Division, Office of Basic Energy Sciences, DOE.G.L. was supported by the National Natural Science Foundation of China (Grants No.11204326 and No.11474296).