Anomalous charge transport in dodecaborides RB12 (R- Ho, Er, Tm, Lu)

TL;DR

This study provides high-precision measurements of Hall and Seebeck coefficients in rare earth dodecaborides, revealing low-temperature anomalies linked to magnetic phase transitions and highlighting the impact of spin fluctuations on charge transport.

Contribution

First detailed measurements of Hall and Seebeck coefficients in RB12 compounds, showing magnetic transition effects and the influence of spin fluctuations on charge transport.

Findings

Detection of low-temperature anomalies related to antiferromagnetic transitions.

Charge carriers mobility is significantly affected by spin fluctuations.

Magnetic phase transitions influence charge transport properties.

Abstract

High precision measurements of Hall RH(T) and Seebeck S(T) coefficients have been carried out for the first time on single crystals of rare earth dodecaborides RB12 (R - Ho, Er, Tm, Lu) at temperatures 1.8 - 300K. Low temperature anomalies associated with antiferromagnetic phase transitions in HoB12, ErB12 and TmB12 compounds have been detected on the temperature dependencies of RH(T) and S(T). The estimated values of charge carriers mobility allowed us to conclude about the appreciable influence of spin fluctuations on the charge transport in these compounds with B12 atomic clusters.