Field-induced magnetic ordering in an alternating Heisenberg chain F5PNN

We have found the field-induced magnetic ordering of an S = 1/2 alternating linear Heisenberg antiferromagnet F5PNN by measuring magnetic field dependence of the specific heat. A cusp-like anomaly is observed below 0.2 K between 3.5 and 6 T. From the extrapolation of H vs. T phase diagram to 0 K, th...

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Published inPhysica. B, Condensed matter Vol. 329-333; pp. 979 - 980
Main Authors Yoshida, Y, Yurue, K, Mitoh, M, Kawae, T, Hosokoshi, Y, Inoue, K, Kinoshita, M, Takeda, K
Format Journal Article
LanguageEnglish
Published 01.05.2003
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Summary:We have found the field-induced magnetic ordering of an S = 1/2 alternating linear Heisenberg antiferromagnet F5PNN by measuring magnetic field dependence of the specific heat. A cusp-like anomaly is observed below 0.2 K between 3.5 and 6 T. From the extrapolation of H vs. T phase diagram to 0 K, the lower and the upper critical fields are expected to be about 3 and 7 T, respectively. The phase boundary is almost symmetric with respect to a horizontal line of H = 5 T. This behavior is consistent with the previously observed magnetization measurement in which magnetization began to increase at about 3 T and saturated at about 7 T.
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ISSN:0921-4526
DOI:10.1016/S0921-4526(02)02043-4