Electrodynamics of the antiferromagnetic phase in URu2Si2

Hall, Jesse S.; Movassagh, M. Rahimi; Wilson, M. N.; Luke, G. M.; Kanchanavatee, N.; Huang, K.; Janoschek, M.; Maple, M. B.; Timusk, T.

doi:10.1103/PhysRevB.92.195111

Title: Electrodynamics of the antiferromagnetic phase in ${URu}_{2} {Si}_{2}$

Journal Article · Fri Nov 06 00:00:00 EST 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.195111· OSTI ID:1418611

Hall, Jesse S. ^[1]; Movassagh, M. Rahimi ^[1]; Wilson, M. N. ^[1]; Luke, G. M. ^[2]; Kanchanavatee, N. ^[3]; Huang, K. ^[3]; Janoschek, M. ^[3]; Maple, M. B. ^[3]; Timusk, T. ^[2]

McMaster Univ., Hamilton, ON (Canada)
McMaster Univ., Hamilton, ON (Canada); Canadian Inst. for Advanced Research, Toronto, ON (Canada)
Univ. of California, San Diego, CA (United States)

Here, we present data on the optical conductivity of URu_2-x(Fe,Os)_xSi₂. While the parent material URu₂Si₂ enters the enigmatic hidden order (HO) phase below 17.5 K, an antiferromagnetic (AFM) phase is induced by the substitution of Fe or Os onto the Ru sites. We find that both the HO and the AFM phases exhibit an identical gap structure that is characterized by a loss of conductivity below the gap energy with spectral weight transferred to a narrow frequency region just above the gap, the typical optical signature of a density wave. The AFM phase is marked by strong increases in both transition temperature and the energy of the gap associated with the transition. In the normal phase just above the transition the optical scattering rate varies as ω². We find that in both the HO and the AFM phases, our data are consistent with elastic resonant scattering of a Fermi liquid. This indicates that the appearance of a coherent state is a necessary condition for either ordered phase to emerge. Our measurements favor models in which the HO and the AFM phases are driven by the common physics of a nesting-induced density wave gap.

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Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-04ER46105; DMR-1206553

OSTI ID:: 1418611

Alternate ID(s):: OSTI ID: 1225409

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 19; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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