R. Spitzfaden et al., AN ELECTRON-PARAMAGNETIC-RESONANCE STUDY OF THE HEAVY-FERMION SYSTEM URU2SI2, Journal of physics. Condensed matter, 8(16), 1996, pp. 2857-2863
Gd EPR measurements on the heavy-fermion system URu2Si2 are reported.
In agreement with NMR results, we observe a heavy-fermion behaviour fo
r 20 K < T < 60 K and the opening of a spin gap below T-N = 17.5 K. Ou
r data reveal an almost constant dynamical susceptibility for T-N < T
< 40 K, followed by a Curie-Weiss-like decrease for higher temperature
s. The temperature dependence of the magnetic relaxation rate is calcu
lated and compared with that derived from neutron scattering experimen
ts.