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Simultaneous metal-insulator and antiferromagnetic transitions in orthorhombic perovskite iridate Sr0.94Ir0.78O2.68 single crystals

Title: Simultaneous Metal-insulator And Antiferromagnetic Transitions In Orthorhombic Perovskite Iridate Sr0.94ir0.78o2.68 Single Crystals.
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Name(s): Zheng, H., author
Terzic, J., author
Ye, Feng, author
Wan, X. G., author
Wang, D., author
Wang, Jinchen, author
Wang, Xiaoping, author
Schlottmann, P., author
Yuan, S. J., author
Cao, G., author
Type of Resource: text
Genre: Text
Date Issued: 2016-06-27
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: The orthorhombic perovskite SrIrO3 is a semimetal, an intriguing exception in iridates where the strong spin-orbit interaction coupled with electron correlations tends to impose an insulating state. We report results of our investigation of bulk single-crystal Sr0.94Ir0.78O2.68 or Ir-deficient, orthorhombic perovskite SrIrO3. It retains the same crystal structure as stoichiometric SrIrO3 but exhibits a sharp, simultaneous antiferromagnetic (AFM) and metal-insulator (MI) transition occurring in the basal-plane resistivity at 185 K. Above it, the basal-plane resistivity features an extended regime of almost linear temperature dependence up to 800 K but the strong electronic anisotropy renders an insulating behavior in the out-of-plane resistivity. The Hall resistivity undergoes an abrupt sign change and grows below 40 K, which along with the Sommerfeld constant of 20 mJ/mol K-2 suggests a multiband effect. All results including our first-principles calculations underscore a delicacy of the paramagnetic, metallic state in SrIrO3 that is in close proximity to an AFM insulating state. The contrasting ground states in isostructural Sr0.94Ir0.78O2.68 and SrIrO3 illustrate a critical role of lattice distortions and Ir deficiency in rebalancing the ground state in the iridates. Finally, the concurrent AFM and MI transitions reveal a direct correlation between the magnetic transition and formation of an activation gap in the iridate, which is conspicuously absent in Sr2IrO4.
Identifier: FSU_libsubv1_wos_000378813800008 (IID), 10.1103/PhysRevB.93.235157 (DOI)
Keywords: high-temperature resistivity, Physics, spin gap, sr2iro4, sriro3, state, transport
Publication Note: The publisher’s version of record is available at https://doi.org/10.1103/PhysRevB.93.235157
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000378813800008
Host Institution: FSU
Is Part Of: Physical Review B.
2469-9950
Issue: iss. 23, vol. 93

Choose the citation style.
Zheng, H., Terzic, J., Ye, F., Wan, X. G., Wang, D., Wang, J., … Cao, G. (2016). Simultaneous Metal-insulator And Antiferromagnetic Transitions In Orthorhombic Perovskite Iridate Sr0.94ir0.78o2.68 Single Crystals. Physical Review B. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000378813800008