Figure 1: Orbital 2CK effect and typical transport properties.
From: Orbital two-channel Kondo effect in epitaxial ferromagnetic L10-MnAl films
(a) Schematic depiction of a TLS with pseudo-spin S=1/2 and strong coupling with conduction electrons. Δz and Δx represent the asymmetry energy and tunnelling matrix element of the TLS. (b) Expected temperature dependence of Δρxx for TLS-induced 2CK effect: Δρxx∼−αlnT for TK<T<T0 (I), Δρxx∼−βT1/2 for TD<T<<TK (II) and deviation from Δρxx∼−βT1/2 for T<TD (III). (c) Schematics of the Hall bar device and measurement scheme. The blue arrow represents the direction of the magnetic field. Vxy and Vxx are Hall and longitudinal voltages, respectively. (d) Hysteretic anomalous Hall resistance (RAH) at room temperature for a L10-MnAl film with Ts=400 °C. (e) T dependence of ρxx at zero external magnetic field for L10-MnAl films with different Ts. The solid lines show the best linear fits at high temperatures, suggesting dominating phonon scattering.
