Optical study on the possible Slater insulator SrIr0.8Sn0.2O3

Zheng, P.; Cui, Q.; Chen, Z. G.; Cheng, J. G.; Liu, X.; Wang, Z. Q.; Luo, J. L.

doi:10.1103/physrevb.100.045101

Title: Optical study on the possible Slater insulator $SrIr_{0.8} Sn_{0.2} O_{3}$

Journal Article · Tue Jul 02 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.100.045101· OSTI ID:1610429

^[1]; Cui, Q. ^[2]; Chen, Z. G. ^[1]; Cheng, J. G. ^[3]; Liu, X. ^[4]; Wang, Z. Q. ^[5]; Luo, J. L. ^[3]

Chinese Academy of Sciences (CAS), Beijing (China)
Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China)
Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China); Songshan Lake Materials Lab., Guangdong (China)
Chinese Academy of Sciences (CAS), Beijing (China); ShanghaiTech Univ. (China)
Boston College, Chestnut Hill, MA (United States)

The orthorhombic perovskite iridate SrIr_0.8Sn_0.2O₃ is reported to be a new candidate of Slater insulator at low temperatures. Here, we present optical spectroscopy measurements on SrIr_0.8Sn_0.2O₃ at different temperatures (T) across the paramagnetic-antiferromagnetic phase transition. The low energy reflectivity decreases with reducing T. Six phonon peaks in the spectrum at low T are visible at room temperature, indicating the absence of crystal structure phase transition from 300 K to 10 K. The real part of conductivity spectra σ₁ (ω) are obtained by employing the standard Kramers-Kronig transformation. In the paramagnetic state at room temperature, σ₁ (ω) reaches a limiting value as ω → 0, implying an electrical conducting state. Upon decreasing T, the low frequency σ₁ (ω) decreases and approaches zero with a concomitant opening of a direct gap. As a result, detailed analysis of the low energy data shows that the gap opening is continuous and σ₁ (ω) at the low energy gap edge follows an unusual ω^1/2 dependence at low temperatures which is remarkably similar to other Slater insulators, such as NaOsO₃.

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Research Organization:: Boston College, Chestnut Hill, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-99ER45747

OSTI ID:: 1610429

Alternate ID(s):: OSTI ID: 1546429

Journal Information:: Physical Review B, Vol. 100, Issue 4; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 1 work

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Title: Optical study on the possible Slater insulator $SrIr_{0.8} Sn_{0.2} O_{3}$