Volume-wise destruction of the antiferromagnetic Mott insulating state through quantum tuning

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Abstract

RENiO3 (RE=rare-earth element) and V2O3 are archetypal Mott insulator systems. When tuned by chemical substitution (RENiO3) or pressure (V2O3), they exhibit a quantum phase transition (QPT) between an antiferromagnetic Mott insulating state and a paramagnetic metallic state. Because novel physics often appears near a Mott QPT, the details of this transition, such as whether it is first or second order, are important. Here, we demonstrate through muon spin relaxation/rotation (μSR) experiments that the QPT in RENiO3 and V2O3 is first order: the magnetically ordered volume fraction decreases to zero at the QPT, resulting in a broad region of intrinsic phase separation, while the ordered magnetic moment retains its full value until it is suddenly destroyed at the QPT. These findings bring to light a surprising universality of the pressure-driven Mott transition, revealing the importance of phase separation and calling for further investigation into the nature of quantum fluctuations underlying the transition.

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Frandsen, B. A., Liu, L., Cheung, S. C., Guguchia, Z., Khasanov, R., Morenzoni, E., … Uemura, Y. J. (2016). Volume-wise destruction of the antiferromagnetic Mott insulating state through quantum tuning. Nature Communications, 7. https://doi.org/10.1038/ncomms12519

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