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Title: Slater insulator in iridate perovskites with strong spin-orbit coupling

Journal Article · · Physical Review Letters
 [1];  [2];  [3];  [4];  [4];  [4];  [5];  [6];  [7];  [1];  [1];  [8];  [8];  [9];  [9];  [10];  [5];  [11];  [7];  [7]
  1. Chinese Academy of Sciences (CAS), Beijing (China)
  2. Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Texas at Austin, Austin, TX (United States)
  3. RIKEN, Saitama (Japan)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  6. Univ. of Arkansas, Fayetteville, AR (United States)
  7. Univ. of Texas at Austin, Austin, TX (United States)
  8. Argonne National Lab. (ANL), Argonne, IL (United States)
  9. Univ. of Tokyo, Chiba (Japan)
  10. Rutgers Univ., Piscataway, NJ (United States)
  11. RIKEN, Saitama (Japan); RIKEN Advanced Institute for Computational Science (AICS), Hyogo (Japan); RIKEN Center for Emergent Matter Science (CEMS), Saitama (Japan)

The perovskite SrIrO3 is an exotic narrow-band metal owing to a confluence of the strengths of the spin-orbit coupling (SOC) and the electron-electron correlations. It has been proposed that topological and magnetic insulating phases can be achieved by tuning the SOC, Hubbard interactions, and/or lattice symmetry. Here, we report that the substitution of nonmagnetic, isovalent Sn4+ for Ir4+ in the SrIr1–xSnxO3 perovskites synthesized under high pressure leads to a metal-insulator transition to an antiferromagnetic (AF) phase at TN ≥ 225 K. The continuous change of the cell volume as detected by x-ray diffraction and the λ-shape transition of the specific heat on cooling through TN demonstrate that the metal-insulator transition is of second order. Neutron powder diffraction results indicate that the Sn substitution enlarges an octahedral-site distortion that reduces the SOC relative to the spin-spin exchange interaction and results in the type-G AF spin ordering below TN. Measurement of high-temperature magnetic susceptibility shows the evolution of magnetic coupling in the paramagnetic phase typical of weak itinerant-electron magnetism in the Sn-substituted samples. Furthermore, a reduced structural symmetry in the magnetically ordered phase leads to an electron gap opening at the Brillouin zone boundary below TN in the same way as proposed by Slater.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725; AC02-06CH11357
OSTI ID:
1330558
Alternate ID(s):
OSTI ID: 1329447
Journal Information:
Physical Review Letters, Vol. 117, Issue 17; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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Cited By (10)

Electron Correlations Engineer Catalytic Activity of Pyrochlore Iridates for Acidic Water Oxidation journal December 2018
Strong-correlation induced high-mobility electrons in Dirac semimetal of perovskite oxide journal January 2019
Effect of Nb concentration on the spin-orbit coupling strength in Nb-doped SrTiO3 epitaxial thin films journal April 2018
A suite-level review of the neutron powder diffraction instruments at Oak Ridge National Laboratory journal September 2018
Structural and electrical properties of epitaxial perovskite CaIr 1− x Ru x O 3 thin films journal September 2018
Contrasted Sn substitution effects on Dirac line node semimetals SrIrO 3 and CaIrO 3 journal December 2019
Optical study on the possible Slater insulator SrIr 0.8 Sn 0.2 O 3 journal July 2019
Variational cluster approach to thermodynamic properties of interacting fermions at finite temperatures: A case study of the two-dimensional single-band Hubbard model at half filling journal November 2018
Epitaxial growth and antiferromagnetism of Sn-substituted perovskite iridate SrI r 0.8 S n 0.2 O 3 journal December 2019
Contrasted Sn Substitution effects on Dirac line node semimetals SrIrO$_{3}$ and CaIrO$_{3}$ preprint January 2019

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