Magnetoresistance of Pr${}_{1-x}$La${}_x$Os${}_4$Sb${}_{12}$: Disentangling local crystalline-electric-field physics and lattice effects

Abstract

Resistivity measurements were performed on Pr${}_{1-x}$La${}_x$Os${}_4$Sb${}_{12}$ single crystals at temperatures down to 20 mK and in fields up to 18 T. The results for dilute-Pr samples ($x=0.3$ and 0.67) are consistent with model calculations performed assuming a singlet crystalline-electric-field (CEF) ground state. The residual resistivity of these crystals features a smeared step centered around 9 T, the predicted crossing field for the lowest CEF levels. The CEF contribution to the magnetoresistance has a weaker-than-calculated dependence on the field direction, suggesting that interactions omitted from the CEF model lead to avoided crossing in the effective levels of the Pr${}^{3+}$ ion. The dome-shaped magnetoresistance observed for $x=0$ and 0.05 cannot be reproduced by the CEF model, and likely results from fluctuations in the field-induced antiferroquadrupolar phase.

References in corpus (6)

• Fermi surface of the heavy fermion superconductor PrOs${}_4$Sb${}_{12}$
• The Crystal Field Potential of PrOs4Sb12: Consequences for Superconductivity
• Field Dependence of Electronic Specific Heat in Two-Band Superconductors
• Transport properties of the heavy fermion superconductor PrOs${}_4$Sb${}_{12}$
• High magnetic field phase diagram of PrOs4Sb12
• Crystalline electric field effects in the electrical resistivity of PrOs${}_4$Sb${}_{12}$

Cited by in corpus (3)

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• The Fermi volume as a probe of hidden order