Unusual signatures of the ferromagnetic transition in the heavy Fermion compound UMn2Al20
Abstract
Magnetic susceptibility results for single crystals of the new cubic compounds UT2Al20 (T=Mn, V, and Mo) are reported. Magnetization, specific heat, resistivity, and neutron diffraction results for a single crystal and neutron diffraction and inelastic spectra for a powder sample are reported for UMn2Al20. For T = V and Mo, temperature independent Pauli paramagnetism is observed. For UMn2Al20, a ferromagnetic transition is observed in the magnetic susceptibility at Tc = 20 K. The specific heat anomaly at Tc is very weak while no anomaly in the resistivity is seen at Tc. We discuss two possible origins for this behavior of UMn2Al20: moderately small moment itinerant ferromagnetism, or induced local moment ferromagnetism.
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