University of Birmingham > Talks@bham > Condensed Matter Physics Seminars > Breakthrough in the study of frustrated ferro-antiferromagnets Rb2Cu2Mo3O12 and Cs2Cu2Mo3O12

Breakthrough in the study of frustrated ferro-antiferromagnets Rb2Cu2Mo3O12 and Cs2Cu2Mo3O12

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Linear-chain molybdates A2Cu2Mo3O12 (A = Rb, Cs) are among the most intriguing frustrated quasi-one-dimensional quantum ferro-antiferromagnets [1]. For over a decade extensive experimental and theoretical work focused on the unique magnetoelectric effect in Rb2Cu2Mo3O12 [2,3], and on spin-nematic Tomonaga-Luttinger liquid behavior in Cs2Cu2Mo3O12 [4]. Unfortunately, a lack of single-crystal samples has hampered any further progress. In a breakthrough, our group has succeeded in growing single crystals for both materials. Subsequent measurements revealed that their magnetic properties are even more complex and intriguing than originally thought [5,6,7]. The previously reported chiral-spin-liquid and magneto-electric high temperature phase in Rb2Cu2Mo3O12 [3] was shown to be spurious and due to impurities. Our comprehensive thermodynamic study mapped out the highly anisotropic low-temperature phase diagram with quantum critical points of different effective dimensionalities [5]. Dielectric experiments revealed this material to be a quantum multiferroic and enabled the first direct excitation-response measurements of critical susceptibility at a magnetic BEC quantum critical point [6]. For the Cs system, a host of exotic field-induced phases was discovered, including a robust presaturation phase that is likely to be a spin-nematic phase [7]. New results pertain to its unconventional magneto-electric response.

References [1] M. Hase et al., Phys. Rev. B 70 , 10426 (2004); J. Appl. Phys. 97, 10B303 (2005). [2] N. Reynolds et al., Phys. Rev. B 99 , 214443 (2019). [3] H. Ueda et al., Phys. Rev. B 101 , 140408® (2020). [4] Y. Hoshino et al., JPS Conf. Proc. 3, 014012 (2014). [5] S. Hayashida et al., Phys. Rev. B 100 , 134427 (2019). [6] S. Hayashida et al., Phys. Rev. Research 3, 033053 (2021). [7] D. Flavi├ín, S. Hayashida et al., Phys. Rev. B 101 , 22408 (2020).

This talk is part of the Condensed Matter Physics Seminars series.

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