Thermal hysteresis phenomena in Eu/Yb superlattices

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Abstract
Thermal hystereses resulting from different cooling conditions were observed in the magnetic properties of epitaxial BCC Eu/Yb superlattices. The magnetic-frozen states, characterized by the cusp in the temperature dependence of the magnetization, were observed for zero-field cooled superlattices. On the other hand, the magnetization of field-cooled superlattices monotonically increased with decreasing temperature. Such phenomena became more distinct as the Eu interlayer distance in the superlattices decreased. Strong magnetic-field dependence, in which the frozen state weakened and the frozen temperature fell with increasing magnetic field, was also present in the zero-field-cooled Eu/Yb superlattices.

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