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arXiv · 1801.07622

Tuning the hybridization and magnetic ground state of electron and hole doped CeOs$_2$Al$_{10}$: an x-ray spectroscopy study

Kai Chen·Martin Sundermann·Fabio Strigari·Jo Kawabata·Toshiro Takabatake·Arata Tanaka·Peter Bencok·Fadi Choueikani·Andrea Severing
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Abstract

Here we present linear and circular polarized soft x-ray absorption spectroscopy (XAS) data at the Ce $M_{4,5}$ edges of the electron (Ir) and hole-doped (Re) Kondo semiconductor CeOs$_2$Al$_{10}$. Both substitutions have a strong impact on the unusual high N$\acute{e}$el temperature, $T_N$=28.5\,K, and also the direction of the ordered moment in case of Ir. The substitution dependence of the linear dichroism is weak thus validating the crystal-field description of CeOs$_2$Al$_{10}$ being representative for the Re and Ir substituted compounds. The impact of electron- and hole-doping on the hybridization between conduction and 4$f$ electrons is related to the amount of $f^0$ in the ground state and reduction of x-ray magnetic circular dichroism. A relationship of $cf$-hybridization strength and enhanced $T_N$ is discussed. The direction and doping dependence of the circular dichroism is in agreement with strong Kondo screening along the crystallographic $a$ direction.

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Kai Chen, Martin Sundermann, Fabio Strigari, Jo Kawabata, Toshiro Takabatake, Arata Tanaka, Peter Bencok, Fadi Choueikani, Andrea Severing. 2018-04-09. Tuning the hybridization and magnetic ground state of electron and hole doped CeOs$_2$Al$_{10}$: an x-ray spectroscopy study. https://doi.org/10.1103/physrevb.97.155106

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