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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
Published on: July 17, 2020
First-Principles Design of the Spinel Iridate Ir_{2}O_{4} for High-Temperature Quantum Spin Ice
Shigeki Onoda1,2, Fumiyuki Ishii3
1Condensed Matter Theory Laboratory, RIKEN, Wako 351-0198, Japan.
Abstract:
Insulating magnetic rare-earth pyrochlores related to spin ice host emergent bosonic monopolar spinons, which obey a magnetic analogue of quantum electrodynamics and may open a route to spinonics. However, the energy scales of the interactions among rare-earth moments are so low (∼ 1 K) that the possible quantum coherence can be achieved at a sub-Kelvin scale. Here, we design high-temperature quantum spin ice materials from first principles. It is shown that the A-site deintercalated spinel iridate Ir_{2}O_{4}, which has been experimentally grown as epitaxial thin films, is a promising candidate for quantum spin ice with a spin-ice-rule interaction of a few tens of meV. Controlling electronic structures of Ir_{2}O_{4} through substrates, it is possible to tune magnetic interactions so that a magnetic Coulomb liquid persists at high temperatures.
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