TY  - JOUR
AU  - Alekseev, P. A.
AU  - Nemkovskiy, Kirill
AU  - Mignot, J.-M.
AU  - Clementyev, E. S.
AU  - Ivanov, A. S.
AU  - Rols, S.
AU  - Bewley, R. I.
AU  - Filipov, V. B.
AU  - Shitsevalova, N. Yu.
TI  - Possible undercompensation effect in the Kondo insulator (Yb,Tm)B${}_{12}$J
JO  - Physical review / B
VL  - 89
IS  - 11
SN  - 1098-0121
CY  - College Park, Md.
PB  - APS
M1  - FZJ-2015-01485
SP  - 115121
PY  - 2014
AB  - 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
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000333125500002
DO  - DOI:10.1103/PhysRevB.89.115121
UR  - https://juser.fz-juelich.de/record/187996
ER  -