Magneto-transport properties governed by the antiferromagnetic fluctuations in heavy fermion superconductor CeIrIn${}_5$

Abstract

In quasi-two dimensional Ce(Ir,Rh)In${}_5$ system, it has been suggested that the phase diagram contains two distinct domes with different heavy fermion superconducting states. We here report the systematic pressure dependence of the electron transport properties in the normal state of CeRh${}_{0.2}$Ir${}_{0.8}$In${}_5$ and CeIrIn${}_5$, which locates in first and second superconducting dome, respectively. We observed non-Fermi liquid behavior at low temperatures in both compounds, including non-quadratic $T-$dependence of the resistivity, large enhancement of the Hall coefficient, and the violation of the Kohler's rule in the magnetoresistance. We show that the cotangent of Hall angle $\cot {\Theta }_H$ varies as $T^2$, and the magnetoresistance is quite well scaled by the Hall angle as $\Delta {\rho }_{xx}/{\rho }_{xx}\propto {\tan }^2{\Theta }_H$. The observed transport anomalies are common features of Ce$M$In${}_5$ ($M$=Co, Rh, and Ir) and high-$T_c$ cuprates, suggesting that the anomalous transport properties observed in CeIrIn${}_5$ are mainly governed by the antiferromagnetic spin fluctuations, not by the Ce-valence fluctuations which has been proposed to be the possible origin for the second superconducting dome.

8 pages, 7 figures, To be published in Phys. Rev. B

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• Valence Fluctuations Revealed by Magnetic Field Scan: Comparison with Experiments in YbXCu_4 (X=In, Ag, Cd) and CeYIn_5 (Y=Ir, Rh)
• Hall effect in heavy-fermion metals
• Possibility of valence-fluctuation mediated superconductivity in Cd-doped CeIrIn${}_5$ probed by In-NQR
• The precursor state to superconductivity in CeIrIn${}_5$: Unusual scaling of magnetotransport