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Ungapped magnetic excitations beyond Hidden Order in URu$_{2-x}$Re$_x$Si$_2$

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.

preprint2020arXivOpen access
Nicholas P. ButchJ. A. Rodriguez-RiveraM. Brian Maple
cond-mat.str-el
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Nicholas P. ButchJ. A. Rodriguez-RiveraM. Brian Maple

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