Effect of defects in the rare-earth sublattice of the Kondo insulator YbB12 on its spectral characteristics and magnetic susceptibility


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The results of measuring the static and dynamic magnetic susceptibilities of several series of samples, which are based on the YbB12 Kondo insulator and are substituted in the rare-earth sublattice, are analyzed. Substitution is performed by nonmagnetic isoelectronic Lu ions; magnetic isoelectronic Tm ions; and nonisoelectronic nonmagnetic Y, Sc, and Zr ions. The static susceptibility is measured by a SQUID magnetometer in weak fields, and the dynamic susceptibility is determined from inelastic neutron scattering data. The magnetic properties are simulated using the spectral function found from neutron experimental data. A one-to-one correspondence is established between the influence of an impurity on the initial neutron spectrum and the temperature dependence of the static susceptibility. The results obtained allow one to analyze the relation between the magnetic properties and the electronic structure of the compounds of the given class.

作者简介

P. Alekseev

National Research Centre “Kurchatov Institute,”; National Research Nuclear University “MEPhI,”

编辑信件的主要联系方式.
Email: pavel_alekseev-r@mail.ru
俄罗斯联邦, pl. Akademika Kurchatova 1, Moscow, 123182; Kashirskoe sh. 31, Moscow, 115409

A. Kuznetsov

National Research Nuclear University “MEPhI,”

Email: pavel_alekseev-r@mail.ru
俄罗斯联邦, Kashirskoe sh. 31, Moscow, 115409

P. Savchenkov

National Research Centre “Kurchatov Institute,”; National Research Nuclear University “MEPhI,”

Email: pavel_alekseev-r@mail.ru
俄罗斯联邦, pl. Akademika Kurchatova 1, Moscow, 123182; Kashirskoe sh. 31, Moscow, 115409

A. Menushenkov

National Research Nuclear University “MEPhI,”

Email: pavel_alekseev-r@mail.ru
俄罗斯联邦, Kashirskoe sh. 31, Moscow, 115409

N. Shitsevalova

Frantsevich Institute for Problems of Materials Science

Email: pavel_alekseev-r@mail.ru
乌克兰, Kiev, 03680

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