Abstract. Local-susceptibility measurements via the NMR shifts of ³¹P and ⁵¹V nuclei in the high-pressure phase of (V O)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 dependences of both the static and dynamical spin susceptibilities become identical at temperatures not far below the spin-gap energy.

Print publication: Issue 12 (31 March 2004)
Received 22 January 2004
Published 12 March 2004