Magneto-transport properties of CeRu${}_2$Al${}_{10}$: Similarities to URu${}_2$Si${}_2$

Abstract

We report on magneto-transport properties of the Kondo semiconducting compound CeRu${}_2$Al${}_{10}$, focusing on its exotic phase below $T_0$ = 27 K. In this phase, an excess thermal conductivity $\kappa$ emerges and is gradually suppressed by magnetic field, strikingly resembling those observed in the hidden-order phase of URu${}_2$Si${}_2$. Our analysis indicates that low-energy magnetic excitation is the most likely origin, as was also proposed for URu${}_2$Si${}_2$ recently, despite the largely reduced magnetic moments. Likewise, other transport properties such as resistivity, thermopower and Nernst effect exhibit distinct features characterizing the very different charge dynamics above and below $T_0$, sharing similarities to URu${}_2$Si${}_2$, too. Given the exotic nature of the ordered phases in both compounds, whether a unified interpretation to all these observations exists appears to be extremely interesting.

5 pages, 4 figures

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