Abstract
We have measured magnetic susceptibility, thermal expansion, electrical resistivity, and magnetoresistance of the intermetallic compound YMn2. YMn2 orders antiferromagnetically belowT N ≃110 K. There is a large thermal hysteresis such that the ordering temperature isT N =86 K on cooling andT N =116 K on warming. This is a first-order phase transition from the paramagnetic to antiferromagnetic phase. Our electrical resistivity and magnetoresistance measurements in the ordered state show a localized magnetic moment for Mn atoms in YMn2 belowT N . The Mn moments collapse atT N which is reflected in the sharp decrease in the thermal expansivity atT N . AboveT N the Mn moment gradually recovers with increasing temperature which is reflected as an increase in χ with increasing temperature in the paramagnetic state. This behavior atT>T N could be described by weak itinerant electron magnetism.
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Ali, N., Labroo, S. Localized magnetism in YMn2 below the néel temperature. J Low Temp Phys 77, 449–455 (1989). https://doi.org/10.1007/BF00682755
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DOI: https://doi.org/10.1007/BF00682755