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The high-pressure phase of (VO)(2)P2O7 comprises a unique kind of spin-1/2 Heisenberg alternating antiferromagnetic chain, in contrast with the ambient pressure phase containing two crystallographically different chains. Magnetic susceptibility and high-field magnetization data showed the presence of a single spin gap of 23 (magnetization) similar to 27 (susceptibility) K, not double as observed for the ambient pressure phase. This result shows that the two kinds of chains of the ambient pressure phase have single, different spin gaps.

New S=1/2 Alternating Chain Compound - High Pressure Form of (VO)2P2O7-

New S=1/2 Alternating Chain Compound - High Pressure Form of (VO)₂P₂O_7-