A low-temperature anomaly in the thermal expansion of solid N2 with O2 impurity
А. ЕжовскиPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovYu. A. FreĭmanPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovA. M. TolkachevPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovV. P. AzarenkovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovV. G. Manzheliı̆Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovE. A. KosobutskayaPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kov
ABI
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An anomaly has been observed in the thermal expansion of the N2–O2 solid solution. The maximum of the anomaly lies in 2.5 °K region, and its relative magnitude for a 1.4% O2 concentration attains a value of 30%. The effect is due to the spin degrees of freedom of the oxygen molecules, but in contrast to the specific heat, only the clusters of exchange-bound molecules contribute to the anomaly.
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