+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

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)



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 115(26): 266402



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.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 058464975

Download citation: RISBibTeXText

PMID: 26765010

DOI: 10.1103/physrevlett.115.266402


Related references

Magnetic Excitations across the Metal-Insulator Transition in the Pyrochlore Iridate Eu_{2}Ir_{2}O_{7}. Physical Review Letters 120(17): 177203, 2018

Tetrahedral magnetic order and the metal-insulator transition in the pyrochlore lattice of Cd2Os2O7. Physical Review Letters 108(24): 247205, 2012

Colossal Magnetoresistance in a Mott Insulator via Magnetic Field-Driven Insulator-Metal Transition. Physical Review Letters 116(21): 216401, 2016

Influence of charge and magnetic ordering on the insulator-metal transition in Pr1-xCaxMnO3. Physical Review. B Condensed Matter 52(20): 14303-14307, 1995

Metal-insulator transition and magnetic ordering in Hubbard models near the Nagaoka limit. Physical Review. B Condensed Matter 49(3): 1632-1641, 1994

Metal-Insulator Transition and Topological Properties of Pyrochlore Iridates. Physical Review Letters 118(2): 026404, 2017

Noncoplanar magnetic ordering driven by itinerant electrons on the pyrochlore lattice. Physical Review Letters 105(22): 226403, 2010

Spectroscopic Studies on the Metal-Insulator Transition Mechanism in Correlated Materials. Advanced Materials 30(42): E1704777, 2018

Magnetic Field-Induced Insulator-Semimetal Transition in a Pyrochlore Nd2Ir2O7. Physical Review Letters 115(5): 056402, 2015

Variation of charge dynamics in the course of metal-insulator transition for pyrochlore-type Nd2Ir2O7. Physical Review Letters 109(13): 136402, 2012

Spontaneous formation of zigzag chains at the metal-insulator transition in the β-pyrochlore CsW2O6. Physical Review Letters 110(16): 166402, 2013

Nature of the transition between a ferromagnetic metal and a spin-glass insulator in pyrochlore molybdates. Physical Review Letters 99(8): 086401, 2007

Spectroscopic studies of the phase transition from the mott insulator state to the charge-ordering state of κ-(ET)4[M(CN)6][N(C2H5)4]·2H2O (M = Co(III) and Fe(III)) salts. Journal of Physical Chemistry. a 117(25): 5241-5250, 2013

Electric-Pulse-driven Electronic Phase Separation, Insulator-Metal Transition, and Possible Superconductivity in a Mott Insulator. Advanced Materials 20(14): 2760-2765, 2008

Charge dynamics near the electron-correlation induced metal-insulator transition in pyrochlore-type molybdates. Physical Review Letters 93(26 Pt 1): 266401, 2004