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Title: Electrodynamics of the antiferromagnetic phase in URu 2 Si 2

Abstract

Here, we present data on the optical conductivity of URu 2-x(Fe,Os) xSi 2. While the parent material URu 2Si 2 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 ω 2. 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.

Authors:
 [1];  [1];  [1];  [2];  [3];  [3];  [3];  [3];  [2]
  1. McMaster Univ., Hamilton, ON (Canada)
  2. McMaster Univ., Hamilton, ON (Canada); Canadian Inst. for Advanced Research, Toronto, ON (Canada)
  3. Univ. of California, San Diego, CA (United States)
Publication Date:
Research Org.:
Univ. of California, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1418611
Alternate Identifier(s):
OSTI ID: 1225409
Grant/Contract Number:  
FG02-04ER46105; DMR-1206553
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 19; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Hall, Jesse S., Movassagh, M. Rahimi, Wilson, M. N., Luke, G. M., Kanchanavatee, N., Huang, K., Janoschek, M., Maple, M. B., and Timusk, T. Electrodynamics of the antiferromagnetic phase in URu2Si2. United States: N. p., 2015. Web. doi:10.1103/PhysRevB.92.195111.
Hall, Jesse S., Movassagh, M. Rahimi, Wilson, M. N., Luke, G. M., Kanchanavatee, N., Huang, K., Janoschek, M., Maple, M. B., & Timusk, T. Electrodynamics of the antiferromagnetic phase in URu2Si2. United States. doi:10.1103/PhysRevB.92.195111.
Hall, Jesse S., Movassagh, M. Rahimi, Wilson, M. N., Luke, G. M., Kanchanavatee, N., Huang, K., Janoschek, M., Maple, M. B., and Timusk, T. Fri . "Electrodynamics of the antiferromagnetic phase in URu2Si2". United States. doi:10.1103/PhysRevB.92.195111. https://www.osti.gov/servlets/purl/1418611.
@article{osti_1418611,
title = {Electrodynamics of the antiferromagnetic phase in URu2Si2},
author = {Hall, Jesse S. and Movassagh, M. Rahimi and Wilson, M. N. and Luke, G. M. and Kanchanavatee, N. and Huang, K. and Janoschek, M. and Maple, M. B. and Timusk, T.},
abstractNote = {Here, we present data on the optical conductivity of URu2-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.},
doi = {10.1103/PhysRevB.92.195111},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 19,
volume = 92,
place = {United States},
year = {2015},
month = {11}
}

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