The electronic structure of epitaxially stabilized 5d perovskite Ca1 −xSrxIrO3 (x= 0, 0.5, and 1) thin films: the role of strong spin–orbit coupling

Jang, Seung Yup; Kim, Heung Sik; Moon, Seok‐Jun; Choi, Woo Seok; Jeon, Byung-Chul; Yu, Jingkun; Noh, T. W.

doi:10.1088/0953-8984/22/48/485602

Cited by 32 publications

(40 citation statements)

References 30 publications

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“…The Hubbard band transition in the J eff,1/2 bands shifts to a lower energy down to 0.2 eV for the semi-metallic n=2 phase, and appears to persist in the three-dimensional correlated metal, SrIrO 3 with n=∞, even if it is quite weak. Clearly, these 0.2 eV optical transition features in (semi)metallic Ir-oxides in the RP series are quite consistent with Peak α in our conductivity spectra of pyrochlore Bi 2 Ir 2 O 7 [5,47]. From this common aspect of (semi)metallic iridates, Peak α in Bi 2 Ir 2 O 7 might be assigned as the correlation-induced interband transition.…”

Section: Resultssupporting

confidence: 84%

Infrared study of the electronic structure of the metallic pyrochlore iridate Bi2Ir2O7

et al. 2013

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We investigated the electronic properties of a single crystal of metallic pyrochlore iridate Bi 2 Ir 2 O 7 by means of infrared spectroscopy. Our optical conductivity data show the splitting of t 2g bands into J eff ones due to strong spin-orbit coupling. We observed a sizable mid-infrared absorption near 0.2 eV which can be attributed to the optical transition within the J eff,1/2 bands.More interestingly, we found an abrupt suppression of optical conductivity in the very farinfrared region. Our results suggest that the electronic structure of Bi 2 Ir 2 O 7 is governed by the 2 strong spin-orbit coupling and correlation effects, which are prerequisite for theoretically proposed non-trivial topological phases in pyrochlore iridates.PACS number: 78.20.-e, 71.30.+h, 71.20.-b 3

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Section: Resultssupporting

confidence: 84%

Infrared study of the electronic structure of the metallic pyrochlore iridate Bi2Ir2O7

et al. 2013

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“…Below we will show the band structures computed for SrIrO 3 , where we use Hubbard U and SOC strength α as tuning parameters to understand different phases realised in other orthorhombic perovskite oxides such as SrRuO 3 and SrRhO 3 . Our findings suggest that the SOC together with Hubbard interaction U plays an important role in realising different ground states in SrRuO 3 [22][23][24][25][26][27], SrRhO 3 [4], and SrIrO 3 [28][29][30].…”

Section: Introductionmentioning

confidence: 78%

Interplay between spin-orbit coupling and Hubbard interaction in SrIrO3and relatedPbnmperovskite oxides

2012

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There has been a rapidly growing interest on the interplay between spin-orbit coupling (SOC) and Hubbard interaction U in correlated materials. A current consensus is that the stronger the SOC, the smaller is the critical interaction U c required for a spin-orbit Mott insulator, because the atomic SOC splits a band into different total angular momentum bands narrowing the effective bandwidth. It was further claimed that at large enough SOC, the stronger the SOC, the weaker the U c because in general the effective SOC is enhanced with increasing electron-electron interaction strength. Contrary to this expectation, we find that, in orthorhombic perovskite oxides (Pbnm), the stronger the SOC, the bigger the U c . This is originated from a line of Dirac node in J e f f = 1/2 bands near the Fermi level inherited from a combination of the lattice structure and a large SOC. Due to this protected line of nodes, there are small hole and electron pockets in SrIrO 3 , and such a small density of states makes Hubbard interaction less efficient in building a magnetic insulator. The full phase diagram in U vs. SOC is obtained, where non-magnetic semimetal, magnetic metal, and magnetic insulator are found. Magnetic ordering patterns beyond U c are also presented. We further discuss implications of our finding in relation to other perovskites such as SrRhO 3 and SrRuO 3 .

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“…Such a bad metallic behaviour was reproduced on the epitaxially stabilized thin films grown on various substrates [26,32], and has been ascribed to a semimetallic ground state with the conduction and valence band touching at Fermi level. The observations of a sign change and a nonlinear magnetic-field dependence of the Hall resistance are consistent with the coexistence of electron and hole charge carriers [26].…”

Section: Physical Propertiesmentioning

confidence: 88%

Synthesis, Crystal Structure, and Physical Properties of the Perovskite Iridates

Cai¹,

Li²,

Cheng³

2016

Perovskite Materials - Synthesis, Characterisation, Properties, and Applications

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Perovskite iridates have emerged as a new paradigm for studying the strongly correlated electron physics with strong spin-orbit coupling. The "113" alkaline-earth iridates AIrO 3 (A = Ca, Sr, Ba) display a rich variety of crystallographic and electronic states and are now attracting growing research interest. This chapter aims to provide an overview for these "113" iridates, including the materials' synthesis, crystal structure, major physical properties, and other interesting results such as the effects of pressure and chemical substitutions, as well as theoretical perspectives.

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The electronic structure of epitaxially stabilized 5d perovskite Ca_{1 −x}Sr_xIrO₃ (x= 0, 0.5, and 1) thin films: the role of strong spin–orbit coupling

Cited by 32 publications

References 30 publications

Infrared study of the electronic structure of the metallic pyrochlore iridate Bi2Ir2O7

Infrared study of the electronic structure of the metallic pyrochlore iridate Bi2Ir2O7

Interplay between spin-orbit coupling and Hubbard interaction in SrIrO3and relatedPbnmperovskite oxides

Synthesis, Crystal Structure, and Physical Properties of the Perovskite Iridates

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