Volume 137, Number 5, March 2022
|Number of page(s)||6|
|Section||Condensed matter and materials physics|
|Published online||06 May 2022|
Terahertz nano-imaging of metal-insulator transition in Cd2Os2O7
1 Department of Physics, Columbia University - New York, NY, USA
2 National Institute for Materials Science - Tsukuba, Ibaraki 305-0003, Japan
3 Department of Physics and Astronomy, Stony Brook University - Stony Brook, NY, USA
4 National Synchrotron Light Source II, Brookhaven National Laboratory - Upton, NY, USA
5 Institute for Solid State Physics, University of Tokyo - Kashiwa, Chiba, Japan
Received: 7 November 2021
Accepted: 28 February 2022
The osmate pyrochlore Cd2Os2O7 supports an antiferromagnet insulator ground state with an all-in/all-out (AIAO) spin ordering at low temperature. Above 225 K, Cd2Os2O7 becomes a paramagnetic metal whereas the mechanism of this metal-to-insulator transition (MIT) remains elusive. In this letter, we use cryogenic near-field technique operating at terahertz frequencies to study the evolution of low-energy response across the MIT. We observed a systematic variation of the magnitude of nano-THz signal across the transition, consistent with the trend in the direct-current conductivity. Conducting domain walls that dominate the nano-scale landscape of the conductivity of a closely related AIAO system Nd2Ir2O7 are not apparent in Cd2Os2O7.
© 2022 The author(s)
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