NMR characterization of spin-1/2 alternating antiferromagnetic chains in the high-pressure phase of (VO)2P2O7

Abstract

Local-susceptibility measurements via the NMR shifts of ${}^{31}$P and ${}^{51}$V nuclei in the high-pressure phase of (VO)${}_2$P${}_2$O${}_7$ confirmed the existence of a unique alternating antiferromagnetic chain with a zero-field spin gap of 34 K. The ${}^{31}$P nuclear spin-lattice relaxation rate scales with the uniform spin susceptibility below about 15 K which shows that the temperature dependence of both the static and dynamical spin susceptibilities becomes identical at temperatures not far below the spin-gap energy.

arXiv comment6 pages, 5 figures; To be published in J. Phys. Condens. Matter

References in corpus (7)

• Thermodynamics and spin gap of the Heisenberg ladder calculated by the look-ahead Lanczos algorithm
• The susceptibility and excitation spectrum of (VO)${}_2$P${}_2$O${}_7$ in ladder and dimer chain models
• Magnetic Excitations in the S=1/2 Alternating Chain Compound (VO)_2P_2O_7
• Inelastic Neutron Scattering from the Spin Ladder Compound (VO)2P2O7
• Theory of Nuclear Magnetic Relaxation in Haldane Gap Antiferromagnets
• Coexistence of double alternating antiferromagnetic chains in (VO)_2P_2O_7 : NMR study
• Magnetic Properties of (VO)_2P_2O_7 from Frustrated Interchain Coupling