Spin fluctuations with two-dimensional XY behavior in a frustrated S = 1/2 square-lattice ferromagnet

Abstract

The spin dynamics of the layered square-lattice vanadate Pb2VO(PO4)2 is investigated by electron spin resonance at various magnetic fields and at temperatures above magnetic ordering. The linewidth divergence towards low temperatures seems to agree with isotropic Heisenberg-type spin exchange suggesting that the spin relaxation in this quasi-two dimensional compound is governed by low-dimensional quantum fluctuations. However, a weak easy- plane anisotropy of the g factor points to the presence of a planar XY type of exchange. Indeed, we found that the linewidth divergence is described best by XY-like spin fluctuations which requires a single parameter only. Therefore, ESR-probed spin dynamics could establish Pb2VO(PO4)2 as the first frustrated square lattice system with XY-inherent spin topological fluctuations.

5 pages, 3 figures

References in corpus (5)

• Finite temperature properties and frustrated ferromagnetism in a square lattice Heisenberg model
• Magnetocaloric effect in the frustrated square lattice J1-J2 model
• Detection of XY behaviour in weakly anisotropic quantum antiferromagnets on the square lattice
• The Two-Dimensional Square-Lattice S=1/2 Antiferromagnet Cu(pz)${}_2$(ClO${}_4$)${}_2$
• Field-induced XY behavior in the S=1/2 antiferromagnet on the square lattice

Cited by in corpus (15)

• Electron Spin Resonance on the spin-1/2 triangular magnet NaYbS2
• Antiferromagnetism of Zn${}_2$VO(PO${}_4{)}_2$ and the dilution with Ti${}^{4+}$
• Spin-chain magnetism and uniform Dzyaloshinsky-Moriya anisotropy in BaV${}_3$O${}_8$
• Effective Spin-1/2 Moments on a Yb${}^{3+}$ Triangular Lattice: an ESR Study
• Singlet ground state in the spin-$1/2$ weakly coupled dimer compound NH${}_4$[(V${}_2$O${}_3$)${}_2$(4,4${}^{\prime }$-$bpy$)${}_2$(H${}_2$PO${}_4$)(PO${}_4$)${}_2$]$\cdot$0.5H${}_2$O
• Pre-saturation phase in the frustrated ferro-antiferromagnet Pb${}_2$VO(PO${}_4$)${}_2$
• Magnetic structure and spin waves in the frustrated ferro-antiferromagnet Pb${}_2$VO(PO${}_4$)${}_2$
• NMR evidence against a spin-nematic nature of the presaturation phase in the frustrated magnet SrZnVO(PO4)2
• Magnetism study on a triangular lattice antiferromagnet Cu${}_2$(OH)${}_3$Br
• Peculiarities of magnetic ordering in the S = 5/2 two-dimensional square-lattice antimonate NaMnSbO4
• Low-temperature thermal conductivity and magnetic transitions of the kagomé-staircase compound Ni${}_3$V${}_2$O${}_8$
• Magnetism study on a frustration-free spatially anisotropic $S$ = 1 square lattice antiferromagnet Ni[SC(NH${}_2$)${}_2$]${}_6$Br${}_2$
• Spin correlations in the frustrated ferro-antiferromagnet SrZnVO(PO4)2 near saturation
• Magnetic resonance in the quasi-2D square lattice easy-plane antiferromagnet Ba${}_2$MnGe${}_2$O${}_7$
• Pseudo-Goldstone mode in altermagnetic $\alpha$-MnTe: high-field electron spin resonance studies