Ram, M. ; Krolas, K. ; Bonville, P. ; Hodges, J. A. ; Hossain, Z. ; Nagarajan, R. ; Dhar, S. K. ; Gupta, L. C. ; Alleno, E. ; Godart, C. (2000) Crystal electric field in YbNi2B2C and YbNiBC observed by 172Yb perturbed angular correlations Journal of Magnetism and Magnetic Materials, 219 (1). pp. 15-21. ISSN 0304-8853
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S03048...
Related URL: http://dx.doi.org/10.1016/S0304-8853(00)00428-5
Abstract
We have measured the thermal variation of the quadrupole hyperfine interaction in the non-superconducting tetragonal borocarbides YbNi2B2C and YbNiBC over the temperature range from 20 to 1000 K using the 172Yb perturbed angular correlations technique. The observed variations are due to the changes in the 4f shell contribution to the electric field gradient at the 172Yb nucleus which are related to the thermal dependent populations of the crystal electric field levels of the Yb3+2F7/2 ground state. In YbNiBC, we determine the complete Yb3+ crystal field level scheme and we confirm that any hybridisation between the 4f and band electrons is weak. In YbNi2B2C, the electric field gradient does show a thermal dependence, thus evidencing the presence of crystal-field levels, but the total variation is relatively small. We consider this result in terms of the combined influence of the crystal field and 4f-conduction band hybridisation.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Borocarbides; Heavy Fermions; Perturbed Angular Correlations |
| ID Code: | 11333 |
| Deposited On: | 09 Nov 2010 03:33 |
| Last Modified: | 02 Jun 2011 04:55 |
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