Optical Spectroscopic Studies of the Metal-Insulator Transition Driven by All-In-All-Out Magnetic Ordering in 5d Pyrochlore Cd_{2}Os_{2}O_{7}

Physical Review Letters
C H SohnT W Noh

Abstract

We investigated the metal-insulator transition (MIT) driven by all-in-all-out (AIAO) antiferromagnetic ordering in the 5d pyrochlore Cd_{2}Os_{2}O_{7} using optical spectroscopy and first-principles calculations. We showed that the temperature evolution in the band-gap edge and free carrier density were consistent with rigid upward (downward) shifts of electron (hole) bands, similar to the case of Lifshitz transitions. The delicate relationship between the band gap and free carrier density provides experimental evidence for the presence of an AIAO metallic phase, a natural consequence of such MITs. The associated spectral weight change at high energy and first-principles calculations further support the origin of the MIT from the band shift near the Fermi level. Our data consistently support that the MIT induced by AIAO ordering in Cd_{2}Os_{2}O_{7} is not close to a Slater type but instead to a Lifshitz type.

References

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Sep 26, 2012·Physical Review Letters·Hiroshi ShinaokaShoji Ishibashi
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Citations

Feb 15, 2017·Scientific Reports·Hishiro T HiroseZenji Hiroi
Aug 16, 2017·Nature Communications·Thi Minh Hien NguyenTae Won Noh
May 30, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Hiroshi ShinaokaPhilipp Werner
Mar 7, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·C MartinsS Biermann
Nov 5, 2016·Reports on Progress in Physics·Mengkun LiuD N Basov
Jul 29, 2018·Nature Communications·Yishu WangYejun Feng
May 15, 2021·Nature Communications·Yejun FengT F Rosenbaum

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