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Title: Robust Coupling between Structural and Electronic Transitions in a Mott Material

Journal Article · · Physical Review Letters
 [1];  [2];  [1];  [1];  [1];  [3];  [1];  [2];  [1]
  1. Univ. of California, San Diego, La Jolla, CA (United States)
  2. Univ. of California, Santa Barbara, CA (United States)
  3. Univ. of California, San Diego, La Jolla, CA (United States); Univ. Paris-Saclay, Palaiseau (France)

The interdependences of different phase transitions in Mott materials are fundamental to the understanding of the mechanisms behind them. One of the most important relations is between the ubiquitous structural and electronic transitions. Using IR spectroscopy, optical reflectivity, and x-ray diffraction, we show that the metal-insulator transition is coupled to the structural phase transition in V2O3 films. This coupling persists even in films with widely varying transition temperatures and strains. Our findings are in contrast to recent experimental findings and theoretical predictions. Using V2O3 as a model system, we discuss the pitfalls in measurements of the electronic and structural states of Mott materials in general, calling for a critical examination of previous work in this field. Furthermore, our findings also have important implications for the performance of Mott materials in next-generation neuromorphic computing technology.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Quantum Materials for Energy Efficient Neuromorphic Computing (Q-MEEN-C); Univ. of California, San Diego, CA (United States); University of California, San Diego, CA (United States)
Sponsoring Organization:
Office of Naval Research (ONR); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0019273
OSTI ID:
1613163
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 5 Vol. 122; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Organismic materials for beyond von Neumann machines journal March 2020
Impact of biaxial and uniaxial strain on V 2 O 3 journal November 2019
Intertwined magnetic, structural, and electronic transitions in V 2 O 3 journal December 2019
Role of V-V dimerization in the insulator-metal transition and optical transmittance of pure and doped VO 2 thin films journal January 2020