Role of the spin anisotropy of the interchain interaction in weakly coupled antiferromagnetic Heisenberg chains

doi:10.1088/1674-1056/ab820b

Abstract In quasi-one-dimensional (q1D) quantum antiferromagnets, the complicated interplay of intrachain and interchain exchange couplings may give rise to rich phenomena. Motivated by recent progress on field-induced phase transitions in the q1D antiferromagnetic (AFM) compound YbAlO₃, we study the phase diagram of spin-1/2 Heisenberg chains with Ising anisotropic interchain couplings under a longitudinal magnetic field via large-scale quantum Monte Carlo simulations, and investigate the role of the spin anisotropy of the interchain coupling on the ground state of the system. We find that the Ising anisotropy of the interchain coupling can significantly enhance the longitudinal spin correlations and drive the system to an incommensurate AFM phase at intermediate magnetic fields, which is understood as a longitudinal spin density wave (LSDW). With increasing field, the ground state changes to a canted AFM order with transverse spin correlations. We further provide a global phase diagram showing how the competition between the LSDW and the canted AFM states is tuned by the Ising anisotropy of the interchain coupling.

Keywords: quasi-one-dimensional quantum antiferromagnets Heisenberg spin chain longitudinal spin density wave

Received: 19 January 2020
Revised: 16 March 2020
Accepted manuscript online:

PACS:	75.10.Pq	(Spin chain models)
	75.50.Ee	(Antiferromagnetics)
	75.30.Fv	(Spin-density waves)
	75.30.Gw	(Magnetic anisotropy)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11674392), the Ministry of Science and Technology of China, National Program on Key Research Project (Grant No. 2016YFA0300504), and the Research Funds of Remnin University of China (Grant No. 18XNLG24). R.Y. acknowledges the hospitality at Tsung-Dao Lee Institute.

Corresponding Authors: Rong Yu
E-mail: rong.yu@ruc.edu.cn

Cite this article:

Yuchen Fan(樊宇辰), Rong Yu(俞榕) Role of the spin anisotropy of the interchain interaction in weakly coupled antiferromagnetic Heisenberg chains 2020 Chin. Phys. B 29 057505

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Role of the spin anisotropy of the interchain interaction in weakly coupled antiferromagnetic Heisenberg chains

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