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

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Local-susceptibility measurements via the NMR shifts of ³¹P and ⁵¹V nuclei in the high-pressure phase of (VO)₂P₂O₇ confirmed the existence of a unique alternating antiferromagnetic chain with a zero-field spin gap of 34 K. The ³¹P 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.