Unusual signatures of the ferromagnetic transition in the heavy fermion compound UMn2Al20

C. H. Wang; J. M. Lawrence; E. D. Bauer; K. Kothapalli; J. S. Gardner; F. Ronning; K. Gofryk; J. D. Thompson; H. Nakotte; F. Trouw

doi:10.1103/PhysRevB.82.094406

Unusual signatures of the ferromagnetic transition in the heavy fermion compound UMn₂Al₂₀

C. H. Wang, J. M. Lawrence, E. D. Bauer, K. Kothapalli, J. S. Gardner, F. Ronning, K. Gofryk, J. D. Thompson, H. Nakotte, F. Trouw

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Abstract

Magnetic-susceptibility results for single crystals of the new cubic compounds U T_2Al20(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 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 UMn₂Al₂₀: moderately small moment itinerant ferromagnetism or induced local-moment ferromagnetism.

Original language	English
Article number	094406
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	82
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevB.82.094406
State	Published - Sep 2 2010
Externally published	Yes

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title = "Unusual signatures of the ferromagnetic transition in the heavy fermion compound UMn2Al20",

abstract = "Magnetic-susceptibility results for single crystals of the new cubic compounds U T2Al20(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 T c =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.",

author = "Wang, {C. H.} and Lawrence, {J. M.} and Bauer, {E. D.} and K. Kothapalli and Gardner, {J. S.} and F. Ronning and K. Gofryk and Thompson, {J. D.} and H. Nakotte and F. Trouw",

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doi = "10.1103/PhysRevB.82.094406",

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T1 - Unusual signatures of the ferromagnetic transition in the heavy fermion compound UMn2Al20

AU - Wang, C. H.

AU - Lawrence, J. M.

AU - Bauer, E. D.

AU - Kothapalli, K.

AU - Gardner, J. S.

AU - Ronning, F.

AU - Gofryk, K.

AU - Thompson, J. D.

AU - Nakotte, H.

AU - Trouw, F.

PY - 2010/9/2

Y1 - 2010/9/2

N2 - Magnetic-susceptibility results for single crystals of the new cubic compounds U T2Al20(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 T c =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.

AB - Magnetic-susceptibility results for single crystals of the new cubic compounds U T2Al20(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 T c =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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Unusual signatures of the ferromagnetic transition in the heavy fermion compound UMn₂Al₂₀

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