Theoretical Analysis of Experimental Valence and Magnetization Data around the Field- and Temperature-Induced Valence Transitions of EuNi

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概要

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• We calculate the valence and the magnetization as functions of magnetic field and temperature for EuNi<inf>2</inf>(Si<inf>0.18</inf>Ge<inf>0.82</inf>)<inf>2</inf>with a single impurity Anderson model (SIAM), taking into account the effects of (i) the first-order nature of field- and temperature-induced valence transitions, (ii) magnetic impurities, and (iii) the Van Vleck paramagnetism for the Eu³⁺state, as well as of the mixed valency between the Eu²⁺and Eu³⁺configurations. The results are in good agreement with recent experimental results by the soft X-ray absorption and X-ray magnetic circular dichroism experiments and also with available data of magnetization measurements. The present SIAM is an improved version of that used to analyze the field-dependent valence observed by hard X-ray absorption measurements. We point out a serious inconsistency between experimental data for the valence observed by hard X-ray experiments and the magnetization curve, but this inconsistency is removed by the new valence data observed by soft X-ray experiments.

• 2013-04-15

著者

• NAKAMURA Tetsuya

  Japan Synchrotron Radiation Research Institute

• Kotani Akio

  Photon Factory Imss High Energy Accelerator Research Organization:riken

• Kotani Akio

  Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan

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