Unusual signatures of the ferromagnetic transition in the heavy Fermion compound UMn$_2$Al$_{20}$

Magnetic susceptibility results for single crystals of the new cubic compounds UT $_{2}$ Al $_{20}$ (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 UMn $_{2}$ Al $_{20}$ . For T = V and Mo, temperature independent Pauli paramagnetism is observed. For UMn $_{2}$ Al $_{20}$ , a ferromagnetic transition is observed in the magnetic susceptibility at $T_{c}$ = 20 K. The specific heat anomaly at $T_{c}$ is very weak while no anomaly in the resistivity is seen at $T_{c}$ . We discuss two possible origins for this behavior of UMn $_{2}$ Al $_{20}$ : moderately small moment itinerant ferromagnetism, or induced local moment ferromagnetism.

Unusual signatures of the ferromagnetic transition in the heavy Fermion compound UMn $_{2}$ Al $_{20}$

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Unusual signatures of the ferromagnetic transition in the heavy Fermion compound UMn $_{2}$ Al $_{20}$

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Unusual signatures of the ferromagnetic transition in the heavy Fermion compound UMn22​Al2020​

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Unusual signatures of the ferromagnetic transition in the heavy Fermion compound UMn22​Al2020​

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Unusual signatures of the ferromagnetic transition in the heavy Fermion compound UMn $_{2}$ Al $_{20}$

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Unusual signatures of the ferromagnetic transition in the heavy Fermion compound UMn $_{2}$ Al $_{20}$

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