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Unconventional magnetic excitations and spin dynamics of exotic quantum spin systems BaCo$$ 2$$V$$ 2$$O$$ 8$$ and Ba$$ 3$$CuSb$$ 2$$O$$ 9$$ by Yibo Han; Shojiro Kimura; Kouichi Okunishi; Masayuki Hagiwara is a Chemistry article available to read on EtoBox.

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We review terahertz (THz) electron spin resonance studies of two types of exotic quantum spin systems, namely, the spin(S)-1/2 one-dimensional (1D) Ising-like antiferromagnet BaCo 2 V 2 O 8 and the S=1/2 two-dimensional (2D) honeycomb-like antiferromagnet Ba 3 CuSb 2 O 9 in magnetic fields of up to 50 T. For the former subject, unconventional magnetic excitations were identified below a critical magnetic field H c (∼ 4 T), where the exotic field-induced order-to-disorder transition occurs, and magnetic excitations in a Tomonaga-Luttinger liquid state were observed above H c . The novel magnetic excitations were analyzed with an S=1/2 1D XXZ model by considering the peculiar structure of this compound. For the latter subject, the orbital quantum dynamics of the spin liquid candidate Ba 3 CuSb 2 O 9 was revealed using multifrequency electron spin resonance ranging from 9.3 GHz to 0.73 THz. The g-factor of the hexagonal Ba 3 CuSb 2 O 9 single crystal possesses a weak six-fold symmetry at low frequencies, while two-fold symmetry is manifested at high frequencies. From the critical point between the two frequency regions, the frequency of the dynamic Jahn-Teller distortion is determined

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Author

Yibo Han; Shojiro Kimura; Kouichi Okunishi; Masayuki Hagiwara

Publisher

Springer Vienna; Springer-Verlag; Springer Verlag; Springer Science and Business Media LLC (ISSN 0937-9347)

Published

2020

Language

EN

Field

Chemistry (Physical Sciences)