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

TL;DR

This study uses NMR techniques to characterize the magnetic properties of the high-pressure phase of (VO)2P2O7, revealing a unique alternating antiferromagnetic chain with a specific spin gap and correlated static and dynamic susceptibilities.

Contribution

It provides the first detailed NMR characterization of the spin-1/2 alternating antiferromagnetic chains in this high-pressure phase, confirming the existence of a zero-field spin gap.

Findings

Confirmed the existence of a 34 K spin gap.

Showed the correlation between static and dynamical susceptibilities below 15 K.

Identified the unique alternating antiferromagnetic chain structure.

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.