Antiferromagnetic instability and the metal-insulator transition in Tm1 − xYb xB12 rare earth dodecaborides.

The magnetic and transport characteristics of substitutional solid solutions of the Tm_{1− x}Yb _xB₁₂ rare earth dodecaborides have been investigated. The measurements performed in the wide temperature range 1.8−300 K on the high-quality single-crystalline samples make it possible to conclude that as x increases, antiferromagnetic instability develops with the quantum critical point ( T _N = 0) near x = 0.3 and relevant dielectrization of the electron structure in the range 0 ≤ x ≤ 0.8 takes place. With the results of the thermoelectric measurements in Tm_{1− x}Yb _xB₁₂, the activation energy values and their dependence on x have been determined. [ABSTRACT FROM AUTHOR]