Thermoelectric Properties of Metallic Hexaborides RB6 (R = La, Pr, Nd, Gd)
Russian Academy of Sciences, Electron spin resonance, spin-dependent electronic effects, and spin technologies
Russian Academy of Sciences, Condensed matter physics and materials of new generation
RFBR, 20-02-00015
Anisimov M.
1, Samarin N.1, Demishev S.1, Bogach A.1, Voronov V.1, Shitsevalova N.2, Levchenko A.2, Filipov V.2, Glushkov V.1
1Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
2Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kyiv, Ukraine
Email: anisimov.m.a@gmail.com
Поступила в редакцию: 29 октября 2020 г.
Выставление онлайн: 12 декабря 2020 г.
Seebeck coefficient has been studied on the single crystals of metallic hexaborides RB6 (R = La, Pr, Nd, Gd) at temperatures of 2-300 K. The experiment has shown that the signal is limited by the values |S|≤1.5 μV/K for all tested materials. The data obtained for the systems LaB6 and GdB6 were approximated by phonon drag contribution caused by quasi-local (Einstein) mode with characteristic temperatures ThetaE(LaB6)~240 K and ThetaE(GdB6)~180 K. On the contrary, the crystal-line electric field effect induces the inversion between negative and positive types of thermoelectricity, which complicates the simulation of phonon drag in the case of PrB6 and NdB6. Keywords: Seebeck effect, phonon drag, hexaborides, metals.
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