Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2012-01-31
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
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. On the other hand, gigantic second harmonic generation signals due to the noncentrosymmetricity of the conducting Ir 5$d$ electrons were observed, which were comparable to that of GaAs. The mediation between the Pb-O' network and the Ir-O conducting network by low-energy optical phonon modes is suggested as its origin. These results stimulate theoretical study of inversion-broken iridates, where exotic quantum states such as a topological insulator and Dirac semimetal are anticipated.
Asoh Keiko
Hirata Yasuyuki
Kiuchi Yoko
Matsushita Yoshitaka
Nakajima Makoto
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