Ga-NMR study of the low-energy excitations in |
| |
Authors: | P. Vonlanthen J.L. Gavilano B. Ambrosini H.R. Ott Y. Aoki H. Sugawara H. Sato |
| |
Affiliation: | Laboratorium für Festk?rperphysik, Eidgen?ssische Technische Hochschule-H?nggerberg, 8093 Zürich, Switzerland, CH Tokyo Metropolitan University, Minami-Ohsawa, Hachioji-shi, Tokyo 192-0397, Japan, JP
|
| |
Abstract: | We report the results of 69Ga- and 71Ga-NMR measurements on NdGa2 at temperatures between 0.1 and and in applied magnetic fields between zero and 74 kOe. NdGa2 orders antiferromagnetically below and undergoes several metamagnetic transitions in external magnetic fields. In zero applied magnetic field and below the temperature dependence of the spin-lattice relaxation rate T1 -1 ( T ) shows a large linear-in-T term, about two orders of magnitude higher than for the reference compound LaGa2. This strong enhancement confirms the presence of low-energy excitations in the antiferromagnetic phase of NdGa2 as was previously indicated by specific heat data. Above , T1 -1 ( T ) is dominated by an exponential term, which we associate with excitations between the lowest energy levels of the f-electron system. The separation of these energy levels is determined by exchange, crystal-field and Zeeman interactions. Received 3 September 1998 and Received in final form 3 November 1998 |
| |
Keywords: | PACS. 75.20.Hr Local moment in compounds and alloys Kondo effect, valence fluctuations, heavy fermions - 75.30.-m Intrinsic properties of magnetically ordered materials - 76.60.-k Nuclear magnetic resonance and relaxation |
本文献已被 SpringerLink 等数据库收录! |
|