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New S=1/2 Alternating Chain Compound - High Pressure Form of (VO)_{2}P_{2}O_{7-}

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Azuma M., Saito T., Hiroi Z., Takano M., Narumi Y., Kindo K.

Acta Physica Polonica A

2000

vol. 97

issue 1

205-208

The high-pressure phase of (VO)_{2}P_{2}O_{7} 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) ~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.

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1 Acta Physica Polonica A

1 2000

1 Azuma M.

1 Hiroi Z.

1 Kindo K.

1 Narumi Y.

1 Saito T.

1 Takano M.

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New S=1/2 Alternating Chain Compound - High Pressure Form of (VO)_{2}P_{2}O_{7-}