Crystal-field levels in pure and diluted

$\chem{DyB_2C_2}$

studied by neutroninelastic scattering technique

Author： Nakamura T. Staub U. Narumi Y. Katsumata K. Juranyi F.

Publisher： Edp Sciences

E-ISSN： 1286-4854|62|2|251-256

ISSN： 0295-5075

Source： EPL (EUROPHYSICS LETTERS), Vol.62, Iss.2, 2010-03, pp. : 251-256

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Abstract

Inelastic neutron scattering experiments on $\chem{Dy^{11}B_2C_2}$and $\chem{Dy_{0.07}Y_{0.93}^{11}B_2C_2}$ have been performed. Theresults enable us to infer important properties of thecrystal-field levels of $\chem{Dy^{3+}}$ in $\chem{DyB_2C_2}$ whichhas fascinating structural and magnetic properties that areattributed to the electronic states of the $\chem{Dy}$ ion. While noclear excitation was observed in pure $\chem{DyB_2C_2}$, threeexcitations from the ground state with the energies 1.4, 4.1 and5.8 meV were observed in$\chem{Dy_{0.07}Y_{0.93}^{11}B_2C_2}$. By comparing the presentresults with the previous crystal-field calculation, we infer that theground state of $\chem{Dy^{3+}}$ in $\chem{YB_2C_2}$ is $\Gamma_8$which is split into two Kramers doublets by the tetragonalpotential. Additionally, the heat capacity measured on thediluted system is compared with a calculation using the low partof the energy level scheme obtained from the neutron experiments.Good agreement between theory and experiment is obtained.