2013
DOI: 10.1103/physrevlett.110.187402
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Mechanism of Enhanced Optical Second-Harmonic Generation in the Conducting Pyrochlore-TypePb2Ir2O7xOxide Compound

Abstract: The structural, electronic, and optical properties of pyrochlore-type Pb 2 Ir 2 O 6 O' 0.55 , which is a metal without spatial inversion symmetry at room temperature, were investigated. Structural analysis revealed that the structural distortion relevant to the breakdown of the inversion symmetry is dominated by the Pb-O' network but is very small in the Ir-O network. At the same time, gigantic second-harmonic generation signals were observed, which can only occur if the local environment of the Ir 5d electron… Show more

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Cited by 48 publications
(12 citation statements)
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“…Similar issue is relevant to the interpretation of data in Ref. [22]. Thus the Weyl scenario leaves unaccounted the low-frequency spectral weight observed in our experiments and also results reported in Ref.…”
Section: Resultsmentioning
confidence: 42%
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“…Similar issue is relevant to the interpretation of data in Ref. [22]. Thus the Weyl scenario leaves unaccounted the low-frequency spectral weight observed in our experiments and also results reported in Ref.…”
Section: Resultsmentioning
confidence: 42%
“…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. However, at the moment the correlated metallic state in Bi 2 Ir 2 O 7 is not reproduced in the theoretical calculations [22,23]. We note that even the previous LDA+U calculation with U ≤ 2 eV did not address the correlation-induced band splitting in metallic pyrochlore iridates [23].…”
Section: Resultsmentioning
confidence: 66%
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