Investigation of the behavior of electrical resistance and thermal emf of polycrystals of europium monosulfide during temperature cycling in the range of 320-800 K
Stepanov N.N.1, Kamenskaya G.A1, Novikov S.V. 1
1Ioffe Institute, St. Petersburg, Russia
Email: stnick@mail.ioffe.ru
The temperature dependences of the electrical resistance R and thermal S of polycrystals of europium monosulfide (EuS) in the range 320-800 K have been studied. It is shown that the processes of cyclic temperature action on polycrystalline EuS samples lead to the appearance of hysteresis on the dependences ln[R(10^3/T)], S(T), as well as a subsequent change of the main free charge carriers in a narrow temperature range of 365-490 K. The analysis of the discovered patterns in the behavior of ln R and S suggests the presence of a significant influence on the indicated kinetic coefficients of the processes of exciton spectrum formation and destruction in temperature cycles. Keywords: europium monosulfide, thermal EMF, electrical resistivity, excitons.
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