Spin fluctuations in the heavy-fermion paramagnetic U(In0.5Sn0.5)3

✍ Scribed by M.A. Polikarpov; V.M. Cherepanov; M.A. Chuev; S.S. Yakimov

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 176 KB
• Volume: 199-200
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(94)91732-9

✦ Synopsis

19Sn MGssbauer spectra of the heavy-fermion intermetallic system U(In,,,Sn,,,), have been measured in the temperature range 4.2-300 K. The room temperature spectrum is characterized by a quadrupole doublet with a splitting value of 1.45 mm/s. With decreasing temperature the spectral line width increases and a hyperfine magnetic structare is developed at helium temperatures. This hyperfine field may be interpreted as bemg transferred via the conductionelectron polarization from the LT to the Sn nucleus. A detailed analysis of the spectral evolution with temperature proves the presence of spin fluctuations in U(In,,,Sn,,,)3 near the transition from local-moment magnetism to itinerant f-electron behavior. The temperature dependence of the srin relaxation rate has been determined.