Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session X56: Electronic Charge and Orbital Ordering
11:15 AM–2:15 PM,
Friday, March 6, 2020
Room: Mile High Ballroom 2C
Sponsoring
Unit:
DCMP
Chair: Zhengqian Cheng, Columbia Univ
Abstract: X56.00012 : Evolution of a structural dimerization across a pressure-induced insulator-metal transition in the spin-orbit Mott insulator GaTa4Se8
Abstract 
Presenter:
Tsung-Han Yang
(Brown University)
Authors:
Tsung-Han Yang
(Brown University)
Tomoya Higo
(Univ of Tokyo-Kashiwanoha)
Shinya Kawamoto
(Univ of Tokyo-Kashiwanoha)
Satoru Nakatsuji
(Univ of Tokyo-Kashiwanoha)
Kemp Plumb
(Brown University)
The interplay between electronic correlations and spin-orbit coupling often gives rise to novel quantum phases of matter. When spin-orbit coupling is strong and orbital degeneracies are present, the lattice also plays an important role in determining magnetic ground states. In the Lacunar spinel GaTa4Se8, electronic correlations localize a single unpaired electron on tetrahedral clusters of Ta ions, while spin-orbit coupling generates Jeff=3/2 magnetic degrees of freedom. At ambient pressures and T=50 K, GaTa4Se8 undergoes a magnetic transition to a valence bond solid state accompanied by a structural dimerization. Hydrostatic pressures can induce an insulator to metal transition, but the evolution of magnetic correlations and the crystal structure across this transition is not known. I will present a series of low temperature, high pressure x-ray diffraction measurements following the evolution of the structural dimerization in GaTa4Se8 across the pressure-induced insulator to metal transition. These measurements shed light on the coupling of spin-orbital pseudo spins with the crystal lattice.
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