Paramagnetic excitations in singlet ground state PrNi{sub 2}Si{sub 2}
- Departamento de Fisica, Universidad de Oviedo, 33007 Oviedo (Spain)
- Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
- Laboratoire Louis Neel, Centre National de la Recherche Scientifique, BP 166X, 38042, Grenoble (France)
The dispersion curves for magnetic excitations along the principal directions of the Brillouin zone of the singlet ground state compound PrNi{sub 2}Si{sub 2} have been measured at 30 K by inelastic neutron-scattering experiments in the paramagnetic phase. From these data we have extracted information about the main exchange interaction coupling parameters J{sub ij} that are responsible for the appearance of an amplitude modulated magnetic order in this compound below T{sub N}=20K. The results are consistent with the long-range character of Ruderman-Kittel-Kasuya-Yosida interactions because in order to describe the dispersion curves observed at 30 K it is necessary to consider the influence of the interaction to the eighth nearest-neighbor Pr{sup 3+} ion along the c direction. In addition, we have studied the thermal dependence of the excitations at several representative points in the Brillouin zone that show an important softening as the temperature is lowered to T{sub N}. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 544934
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 56, Issue 18; Other Information: PBD: Nov 1997
- Country of Publication:
- United States
- Language:
- English
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