Time-resolved optical study of the metal-to-insulator transition in Cd2Os2O7

The 5d transition metal oxide Cd₂Os₂O₇ undergoes a continuous metal-to-insulator transition (MIT) with a concomitant magnetic transition into an all-in-all-out (AIAO) antiferromagnetic state below a critical temperature T_MIT = 227 K. Here, we investigate the effects of this transition on its photo-carrier dynamics by performing temperature and wavelength dependent ultrafast optical reflectivity measurements. We show that the opening of a charge gap at T_MIT causes a divergence like behavior of the photo-carrier relaxation time consistent with a Rothwarf-Taylor model. Our efforts to perform these experiments under high pressurize environments will also be discussed, which is motivated by recent resonant x-ray diffraction results on Cd₂Os₂O₇ showing a monotonic suppression of AIAO order with pressure.

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Bulletin of the American Physical Society

APS March Meeting 2019

Volume 64, Number 2

Monday–Friday, March 4–8, 2019; Boston, Massachusetts

Session H46: 4d/5d Transition Metal Systems -- Pyrochlores

Abstract: H46.00003 : Time-resolved optical study of the metal-to-insulator transition in Cd2Os2O7

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Abstract: H46.00003 : Time-resolved optical study of the metal-to-insulator transition in Cd₂Os₂O₇