Magnetotransport Properties of Heavy-Fermion Ferromagnet YbPtGe

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The transverse magnetoresistivity $\rho_{\text{H}}$, Hall coefficient $R_{\text{H}}$, and specific heat $C$ for $H\parallel a$ below 10 kOe for the moderate heavy-fermion ferromagnet YbPtGe with the Curie-temperature $T_{\text{C}}=5.4$ K are reported. It is observed that the $\rho_{\text{H}}(T)$ values for the currents along the three crystallographic axes markedly decrease below 30 K with increasing applied magnetic field up to 90 kOe. Below $T_{\text{C}}$, $\rho_{\text{H}}(H)$ at low fields show peak structures for $H\parallel a$ and $H\parallel b$, and a shoulder for $H\parallel c$, the positions of which correspond to those of shoulders that observed in the field dependence of the magnetization. The sharp peak of $C(T)$ due to magnetic transition decays and shifts to the low-temperature side with increasing field for $H\parallel a$ up to 3 kOe. The $H$–$T$ phase diagram below $T_{\text{C}}$ is proposed from those measurements. In addition, $R_{\text{H}}(T)$ for $I\parallel b$ and $H\parallel c$ at 10 kOe increases from a value close to the expected Hall coefficient for a carrier concentration of 1 hole/f.u. with decreasing temperature from 300 K, and shows a peak at 8 K. By the application of a magnetic field, this peak decays and shifts to higher temperatures. $R_{\text{H}}(T,H)$ for $I\parallel b$ and $H\parallel a$ is similar to that for $I\parallel b$ and $H\parallel c$. These peaks of $R_{\text{H}}(T)$ are ascribed to the extraordinary Hall effect due to the skew scattering of conduction carriers.
2010-08-15

Magnetotransport Properties of Heavy-Fermion Ferromagnet YbPtGe

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