Zhu, M.; Peng, J.; Zou, T.; Prokes, K.; Mahanti, S.D.; Hong, T.; Mao, Z.Q.; Liu, G.Q.; Ke, X: Colossal Magnetoresistance in a Mott Insulator via Magnetic Field-Driven Insulator-Metal Transition. Physical Review Letters 116 (2016), p. 216401/1-5
10.1103/PhysRevLett.116.216401
Open Access Version (externer Anbieter)
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.