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Ungapped magnetic excitations beyond Hidden Order in URu_(2-x)Re_xSi₂

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arxiv 2006.03144 v1 pith:AKBR3N6W submitted 2020-06-04 cond-mat.str-el

Ungapped magnetic excitations beyond Hidden Order in URu_(2-x)Re_xSi₂

Nicholas P. Butch , J. A. Rodriguez-Rivera , M. Brian Maple This is my paper
classification cond-mat.str-el
keywords orderexcitationshiddenmagneticassociatedsubstitutionungappedaffect
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We use inelastic neutron scattering measurements to show that the energy gap in the magnetic excitations of URu$_2$Si$_2$, induced by the Hidden Order transition, is closed by Re substitution. The magnetic excitations remain ungapped in compositions where the specific heat anomaly associated with Hidden Order is no longer observed, which means that the entropy associated with Hidden Order is tied mostly to the magnetic gapping. Further, the onset of ferromagnetic order does not gap the excitations, reflecting the fact that Re substitution does not dramatically affect the Kondo lattice hybridization.

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