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Title: Mott transition controlled by lattice-orbital coupling in 3 d -metal-doped double-layer ruthenates

Journal Article · · Physical Review B
 [1];  [2];  [2];  [2];  [2];  [3];  [3];  [4];  [5];  [6];  [6];  [6];  [6];  [2];  [2];  [3];  [2]
  1. Nanjing University (China); Tulane University, New Orleans, LA (United States)
  2. Nanjing University (China)
  3. Tulane University, New Orleans, LA (United States)
  4. Chinese Academy of Sciences, Ningbo (China)
  5. Michigan State University, East Lansing, MI (United States)
  6. Chinese Academy of Sciences, Hefei (China)

We have investigated unusual phase transitions that were triggered by chemical doping in Ca3Ru2O7. Our experiments showed that doping with a few percent of Mn (>4%) can change the quasi-two-dimensional metallic state of Ca3Ru2O7 into a Mott insulating state with a G-type antiferromagnetic order, but this Mott state cannot be induced by Fe doping. By combining these results with first-principles calculations, we show that lattice-orbital coupling (LOC) plays an important role in the Mott transition. Interestingly, the transition temperature TMIT is found to be predetermined by a structural parameter denoted by c/√ab at temperatures far above Néel temperature TN. This LOC-assisted Mott transition clearly contrasts with the band-filling picture. It is addressed that this type of Mott transition originates in the strong scattering centers formed by specific 3d dopants. The dopant-scattering picture is then applied to explain the puzzling doping effects that occur in other ruthenates and 3d oxides. As a result, our findings will advance the general understanding of how the unusual properties of 4d correlated systems are governed by the complex interplay that occurs among the charge, spin, lattice, and orbital degrees of freedom.

Research Organization:
Louisiana State Univ., Baton Rouge, LA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012432
OSTI ID:
1670445
Alternate ID(s):
OSTI ID: 1406653
Journal Information:
Physical Review B, Vol. 96, Issue 20; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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Cited By (2)

Electron mass enhancement and magnetic phase separation near the Mott transition in double-layer ruthenates journal August 2018
A high-temperature multiaxial precision time-delayed dielectric switch crystal triggered by linear/propeller/ball three-form motion journal January 2019