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Title: Colossal magnetoresistance in a Mott insulator via magnetic field-driven insulator-metal transition

Journal Article · · Physical Review Letters
 [1];  [2];  [1];  [3];  [1];  [4];  [2];  [5];  [1]
  1. Michigan State Univ., East Lansing, MI (United States)
  2. Tulane Univ., New Orleans, LA (United States)
  3. Helmholtz Zentrum Berlin, Berlin (Germany)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Chinese Academy of Sciences, Ningbo (China)

Here, 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.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1344989
Alternate ID(s):
OSTI ID: 1254386
Journal Information:
Physical Review Letters, Vol. 116, Issue 21; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

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Cited By (5)

Insulator–metal transition induced by electric voltage in a ruthenate Mott insulator journal March 2019
Magnetoelectric multipoles in metals
  • Thöle, Florian; Spaldin, Nicola A.
  • Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 376, Issue 2134 https://doi.org/10.1098/rsta.2017.0450
journal October 2018
Holographic DC conductivity for backreacted nonlinear electrodynamics with momentum dissipation journal January 2019
Magnetoelectric multipoles in metals text January 2018
Holographic DC Conductivity for Backreacted Nonlinear Electrodynamics with Momentum Dissipation text January 2018

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