Linear Trimer Molecule Formation by Three-Center?Four-Electron Bonding in a Crystalline Solid RuP
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Hirai, Daigorou↗
Engineering topics
Hiroi, Zenji
Publications and source records attributed to Hiroi, Zenji.
Terahertz nano-imaging of metal-insulator transition in Cd 2 Os 2 O 7
The osmate pyrochlore Cd 2 Os 2 O 7 supports an antiferromagnet insulator ground state with an all-in/all-out (AIAO) spin ordering at low temperature. Above 225 K, Cd 2 Os 2 O 7 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 Nd 2 Ir 2 O 7 are not apparent in Cd 2 Os 2 O 7
36 MATERIALS SCIENCE↗