Continuous control of classical-quantum crossover by external high pressure in the coupled chain compound CsCuCl3

Daisuke Yamamoto (), Takahiro Sakurai (), Ryosuke Okuto, Susumu Okubo, Hitoshi Ohta, Hidekazu Tanaka and Yoshiya Uwatoko
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Daisuke Yamamoto: Nihon University
Takahiro Sakurai: Kobe University
Ryosuke Okuto: Kobe University
Susumu Okubo: Kobe University
Hitoshi Ohta: Kobe University
Hidekazu Tanaka: Tokyo Institute of Technology
Yoshiya Uwatoko: The University of Tokyo

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract In solid materials, the parameters relevant to quantum effects, such as the spin quantum number, are basically determined and fixed at the chemical synthesis, which makes it challenging to control the amount of quantum correlations. We propose and demonstrate a method for active control of the classical-quantum crossover in magnetic insulators by applying external pressure. As a concrete example, we perform high-field, high-pressure measurements on CsCuCl3, which has the structure of weakly-coupled spin chains. The magnetization process experiences a continuous evolution from the semi-classical realm to the highly-quantum regime with increasing pressure. Based on the idea of "squashing” the spin chains onto a plane, we characterize the change in the quantum correlations by the change in the value of the local spin quantum number of an effective two-dimensional model. This opens a way to access the tunable classical-quantum crossover of two-dimensional spin systems by using alternative systems of coupled-chain compounds.

Date: 2021
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DOI: 10.1038/s41467-021-24542-6

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