High-field magnetization and electronic spin resonance study in the twisted honeycomb lattice α-Mn2V2O7

R Chen; H J Hu; Z Qu; Y R Song; Q K Lei; C B Liu; Y S Tang; C L Wang; Z Z He; Z W Ouyang; K Zhang; Y Qiu; C Dong; J F Wang

doi:10.1088/1361-648X/acc225

High-field magnetization and electronic spin resonance study in the twisted honeycomb lattice α-Mn₂V₂O₇

J Phys Condens Matter. 2023 Mar 16;35(20). doi: 10.1088/1361-648X/acc225.

Authors

R Chen^{1

2}, H J Hu¹, Z Qu¹, Y R Song², Q K Lei¹, C B Liu^{2

3}, Y S Tang⁴, C L Wang¹, Z Z He³, Z W Ouyang², K Zhang², Y Qiu¹, C Dong², J F Wang²

Affiliations

¹ Department of Physics and Electronic Engineering, Xinyang Normal University, Xinyang 464000, People's Republic of China.
² Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
³ State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, People's Republic of China.
⁴ Laboratory of Solid State Microstructures and Innovation Center of Advanced Microstructures. Nanjing University, Nanjing 210093, People's Republic of China.

PMID: 36881910
DOI: 10.1088/1361-648X/acc225

Abstract

We report the single-crystal growth of Mn₂V₂O₇and the results of magnetic susceptibility, high-field magnetization up to 55 T and high-frequency electric spin resonance (ESR) measurements for its low-temperatureαphase. Two antiferromagnetic (AFM) ordering at 17.5 K and 3 K and obvious magnetic anisotropy are observed inα-Mn₂V₂O₇upon cooling. In pulsed high magnetic fields, the compound reaches the saturation magnetic moment of ∼10.5μ_Bfor each molecular formula at around 45 T after two undergoing AFM phase transitions atH_c1≈ 16 T,H_c2≈ 34.5 T forH//[11-0] andH_sf1= 2.5 T,H_sf2= 7 T forH//[001]. In these two directions, two and seven resonance modes are detected by ESR spectroscopy, respectively. Theω₁andω₂modes ofH//[11-0] can be well described by two-sublattice AFM resonance mode with two zero-field gaps at 94.51 GHz and 169.28 GHz, indicating a hard-axis feature. The seven modes forH//[001] are partially separated by the critical fields ofH_sf1andH_sf2, displaying the two signs of spin-flop transition. The fittings ofω_c1andω_c2modes yield zero-field gaps at 69.50 GHz and 84.73 GHz forH//[001], confirming the axis-type anisotropy. The saturated moment and gyromagnetic ratio indicate the Mn²⁺ion inα-Mn₂V₂O₇is in a high spin state with orbital moment completely quenched. A quasi-one-dimensional magnetism with a zig-zag-chain spin configuration is suggested inα-Mn₂V₂O₇, due to the special neighbor interactions caused by a distorted network structure with honeycomb layer.

Keywords: high-field magnetization; high-frequency ESR; honeycomb lattice; spin flop transition.