51V NMR study of antiferromagnetic state and spin dynamics in quasi-one-dimensional BaCo2V2O

Abstract

arXiv:1210.0272v1 [cond-mat.str-el] We report on our 51 V-NMR study of static and dynamical magnetic properties in the quasione-dimensional antiferromagnet BaCo2V2O8. Although the NMR spectrum shows well-defined antiferromagnetic (AF) order in the Néel ground state, the AF characteristic from the NMR spectrum is incomplete between 3.5 K and TN = 5.4 K, which could be affected by quantum spin fluctuations. The AF NMR spectrum indicates two V sites experiencing different magnetic field magnitudes, HA1 = 2.1 kOe and HA2 = 3.8 kOe. These internal fields could be explained by accounting for the classical and the pseudo-dipolar fields from Co 2+ spins with a proposed magnetic structure based on the neutron diffraction measurements. In the paramagnetic state, the nuclear spin relaxation is dominated by AF spin fluctuations through the dipolar-type coupling between V and surrounding Co 2+ ions. The linear relation between the nuclear spin-lattice relaxation rate 1/T1T and the magnetic susceptibility χ indicates that the Q component of magnetic susceptibility χ(Q) is roughly proportional to χ, where Q is the AF wave number. A change in slope of 1/T1T with respect to χ around 150 K suggests a change in the AF spin fluctuation spectrum.

Near room temperature antiferromagnetic ordering with a potential low-dimensional magnetism in AlMn2B2

“…Since the rectangular shape is character-istic of NMR spectrum in AFM ordered state for powder sample, the results clearly indicate that the magnetic phase transition around 315 K is AFM. Similar rectangular NMR spectra in AFM state have been observed in BiMn 2 PO 6 [24], NaVGe 2 O 6 [25], CuV 2 O 6 [26], and BaCo 2 V 2 O 8 [27] .…”

E8 Spectra of Quasi-One-Dimensional Antiferromagnet BaCo2VZou1, Cui2, Wang3 et al. 2021Phys. Rev. Lett.Self Cite332140View full textAdd to dashboardCite

“…Despite these inherent difficulties, the observation of the lowest two E 8 states (m 1 and m 2 ) at the 1D ferromagnetic QCP of the quasi-1D magnet CoNb 2 O 6 from inelastic neutron scattering (INS) measurements provided evidence of the quantum E 8 spectrum [9], and motivated further materials-based studies on this fascinating phenomenon [10]. Recently, the quasi-1D Heisenberg-Ising antiferromagnetic (AFM) materials, e.g., BaCo 2 V 2 O 8 (BCVO) and SrCo 2 V 2 O 8 (SCVO), has attracted numerous studies with rich quantum phases and excitations induced by transverse or longitudinal field [11][12][13][14][15][16][17][18]. It is desirable to explore whether this system can host a complete picture of E 8 physics.…”

Giant magnetic field dependence of the coupling between spin chains inBaCo2V2O8

“…Among them, BaCo 2 V 2 O 8 [27] has been recently studied [28][29][30][31][32][33][34][35][36][37][38][39][40][41] as one of a few with accessible critical fields, i.e., B c = 3.8 T and B s = 22.8 T [30]. The system develops a standard low-temperature Néel ordered phase in the field range up to B c [29,31] (Fig.…”