Possible undercompensation effect in the Kondo insulator (Yb,Tm)B${}_{12}$J

Alekseev, P. A.; Shitsevalova, N. Yu.; Ivanov, A. S.; Nemkovskiy, Kirill; Rols, S.; Clementyev, E. S.; Filipov, V. B.; Bewley, R. I.; Mignot, J.-M.

doi:10.1103/PhysRevB.89.115121

Journal Article

FZJ-2015-01485

Possible undercompensation effect in the Kondo insulator (Yb,Tm)B${}_{12}$J

Alekseev, P. A. (Corresponding Author) ; Nemkovskiy, K.FZJ* ; Mignot, J.-M. ; Clementyev, E. S. ; Ivanov, A. S. ; Rols, S. ; Bewley, R. I. ; Filipov, V. B. ; Shitsevalova, N. Y.

2014
APS College Park, Md.

Physical review / B 89(11), 115121 (2014) [10.1103/PhysRevB.89.115121]

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Please use a persistent id in citations: http://hdl.handle.net/2128/8411 doi:10.1103/PhysRevB.89.115121

Abstract: The effects of Tm substitution on the dynamical magnetic response of Yb1−xTmxB12 (x=0, 0.08, 0.15, and 0.75) and Lu0.92Tm0.08B12 compounds have been studied using time-of-flight inelastic neutron scattering. Major changes were observed in the spectral structure and temperature evolution of the Yb contribution to the inelastic response for a rather low content of magnetic Tm ions. A sizable influence of the RB12 host (YbB12, as compared to LuB12 or pure TmB12) on the crystal-field splitting of the Tm3+ ion is also reported. The results point to a specific effect of impurities carrying a magnetic moment (Tm, as compared to Lu or Zr) in a Kondo insulator, which is thought to reflect the “undercompensation” of Yb magnetic moments, originally Kondo screened in pure YbB12. A parallel is made with the strong effect of Tm substitution on the temperature dependence of the Seebeck coefficient in Yb1−xTmxB12, which was reported previously

Keyword(s): Basic research (1st) ; Others (1st) ; Energy (1st) ; Magnetism (2nd) ; Condensed Matter Physics (2nd)