Magnetic neutron scattering and crystal-field states in CeCu2Si2
Magnetic neutron scattering and crystal-field states in CeCu2Si2
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CeCu2Si2 中的磁中子散射和晶场态
DOI：
10.1103/physrevb.23.3171
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发表时间：
1981
影响因子：
3.7
通讯作者：
J. Flouquet
中科院分区：
文献类型：
--
作者：
S. Horn;E. Holland;M. Loewenhaupt;F. Steglich;H. Scheuer;A. Benoît;J. Flouquet
The energy-loss spectra of Ce${\mathrm{Cu}}_{2}$${\mathrm{Si}}_{2}$ and La${\mathrm{Cu}}_{2}$${\mathrm{Si}}_{2}$ have been determined using neutrons of high incident energy. The magnetic part of the low-temperature spectra of Ce${\mathrm{Cu}}_{2}$${\mathrm{Si}}_{2}$ consists of a quasielastic line and two inelastic lines at 12.5 and 31 meV resulting from transitions between the Kramers ground state and two excited crystal-field doublets of ${\mathrm{Ce}}^{3+}$ in tetragonal symmetry. When positions as well as intensities of the inelastic lines are used, the crystal-field level scheme can be derived. The temperature dependence and magnitude of the quasielastic linewidth suggest that the contribution of Kondo-type spin fluctuations to the spin dynamics of Ce${\mathrm{Cu}}_{2}$${\mathrm{Si}}_{2}$ predominates over that of valence fluctuations. No indication of any magnetic ordering in Ce${\mathrm{Cu}}_{2}$${\mathrm{Si}}_{2}$ was found by neutron diffraction down to the mK range.
The energy-loss spectra of Ce${\mathrm{Cu}}_{2}$${\mathrm{Si}}_{2}$ and La${\mathrm{Cu}}_{2}$${\mathrm{Si}}_{2}$ have been determined using neutrons of high incident energy. The magnetic part of the low-temperature spectra of Ce${\mathrm{Cu}}_{2}$${\mathrm{Si}}_{2}$ consists of a quasielastic line and two inelastic lines at 12.5 and 31 meV resulting from transitions between the Kramers ground state and two excited crystal-field doublets of ${\mathrm{Ce}}^{3+}$ in tetragonal symmetry. When positions as well as intensities of the inelastic lines are used, the crystal-field level scheme can be derived. The temperature dependence and magnitude of the quasielastic linewidth suggest that the contribution of Kondo-type spin fluctuations to the spin dynamics of Ce${\mathrm{Cu}}_{2}$${\mathrm{Si}}_{2}$ predominates over that of valence fluctuations. No indication of any magnetic ordering in Ce${\mathrm{Cu}}_{2}$${\mathrm{Si}}_{2}$ was found by neutron diffraction down to the mK range.