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Ultrafast dynamics of the Itinerant Antiferromagnet UNiGa5

  • Ee Min Elbert Chia (a1), H. J. Lee (a2), Namjung Hur (a3), E. D. Bauer (a4), T. Durakiewicz (a5), R. D. Averitt (a6), J. L. Sarrao (a7) and A. J. Taylor (a8)...

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.

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