Double dome structure of the Bose–Einstein condensation in diluted S = 3/2 quantum magnets

Yoshito Watanabe (), Atsushi Miyake, Masaki Gen, Yuta Mizukami, Kenichiro Hashimoto, Takasada Shibauchi, Akihiko Ikeda, Masashi Tokunaga, Takashi Kurumaji, Yusuke Tokunaga and Taka-hisa Arima ()
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Yoshito Watanabe: The University of Tokyo
Atsushi Miyake: The University of Tokyo
Masaki Gen: The University of Tokyo
Yuta Mizukami: The University of Tokyo
Kenichiro Hashimoto: The University of Tokyo
Takasada Shibauchi: The University of Tokyo
Akihiko Ikeda: University of Electro-Communications
Masashi Tokunaga: The University of Tokyo
Takashi Kurumaji: The University of Tokyo
Yusuke Tokunaga: The University of Tokyo
Taka-hisa Arima: The University of Tokyo

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Bose–Einstein condensation (BEC) in quantum magnets, where bosonic spin excitations condense into ordered ground states, is a realization of BEC in a thermodynamic limit. Although previous magnetic BEC studies have focused on magnets with small spins of S ≤ 1, larger spin systems potentially possess richer physics because of the multiple excitations on a single site level. Here, we show the evolution of the magnetic phase diagram of S = 3/2 quantum magnet Ba2CoGe2O7 when the averaged interaction J is controlled by a dilution of magnetic sites. By partial substitution of Co with nonmagnetic Zn, the magnetic order dome transforms into a double dome structure, which can be explained by three kinds of magnetic BECs with distinct excitations. Furthermore, we show the importance of the randomness effects induced by the quenched disorder: we discuss the relevance of geometrical percolation and Bose/Mott glass physics near the BEC quantum critical point.

Date: 2023
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DOI: 10.1038/s41467-023-36725-4

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