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

Author:

Watanabe YoshitoORCID,Miyake AtsushiORCID,Gen Masaki,Mizukami Yuta,Hashimoto KenichiroORCID,Shibauchi TakasadaORCID,Ikeda AkihikoORCID,Tokunaga MasashiORCID,Kurumaji Takashi,Tokunaga Yusuke,Arima Taka-hisaORCID

Abstract

AbstractBose–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.

Funder

MEXT | Japan Society for the Promotion of Science

MEXT | JST | Core Research for Evolutional Science and Technology

Publisher

Springer Science and Business Media LLC

Subject

General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry,Multidisciplinary

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