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Ultrafast dynamics of the Itinerant Antiferromagnet UNiGa5

Published online by Cambridge University Press:  26 February 2011

Ee Min Elbert Chia ,
H. J. Lee ,
Namjung Hur ,
E. D. Bauer ,
T. Durakiewicz ,
R. D. Averitt ,
J. L. Sarrao  and
A. J. Taylor
Ee Min Elbert Chia
Affiliation:
elbert@lanl.gov, Los Alamos National Laboratory, MST-CINT, MS G756, Los Alamos, NM, 87545, United States, 505-665-3550, 505-665-9030
H. J. Lee
Affiliation:
haelee@lanl.gov, Los Alamos National Laboratory, United States
Namjung Hur
Affiliation:
nhur@lanl.gov, Los Alamos National Laboratory, United States
E. D. Bauer
Affiliation:
edbauer@lanl.gov, Los Alamos National Laboratory, United States
T. Durakiewicz
Affiliation:
tomasz@lanl.gov, Los Alamos National Laboratory, United States
R. D. Averitt
Affiliation:
raveritt@lanl.gov, Los Alamos National Laboratory, United States
J. L. Sarrao
Affiliation:
sarrao@lanl.gov, Los Alamos National Laboratory, United States
A. J. Taylor
Affiliation:
ttaylor@lanl.gov, Los Alamos National Laboratory, United States
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Abstract

Time-resolved photoinduced reflectivity data were measured for the itinerant antiferromagnet UNiGa5 (TN ≈ 85 K) from room temperature down to 10 K. The relaxation time τ increases sharply near TN, which we attribute to the opening of a spin gap. In addition, at the lowest temperatures τ increases with a T1 dependence, which is similar to that shown by the heavy fermion YbAgCu4, but with no blocking of electron-phonon scattering within the DOS peak. The transient amplitude increase at TN with a temperature dependence that is consistent with the appearance of a spin gap.

Keywords

actinideoptical propertiesmagnetic properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 893: Symposium JJ – Actinides 2005 – Basic Science, Applications and Technology , 2005 , 0893-JJ05-08
Copyright
Copyright © Materials Research Society 2006

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References

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