Magnetoresistance Scaling and the Anisotropy of Charge Carrier Scattering in the Paramagnetic Phase of Ho0.8Lu0.2B12 Cage Glass

The transverse magnetoresistance of Ho0.8Lu0.2B12 dodecaboride with a cage glass structure is studied at low (2-10 K) temperatures. It is demonstrated that the isotropic negative magnetoresistance in this antiferromagnet is dominant within the broad temperature range near T (N) ae K. This contribution to the total magnetoresistance is due to the scattering of charge carriers by nanoclusters formed by DeD 3/4 (3+) ions, and it can be scaled in the rho = f(mu(2) (eff) H (2)/T (2) ) representation. It is found that the magnetoresistance anisotropy above (about 15% at 80 kOe) is due to the positive contribution, which achieves maximum values at the magnetic field direction close to H a center dot [001]. The anisotropy of the charge carrier scattering is interpreted in terms of the cooperative dynamic Jahn-Teller effect at D'12 clusters.