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High-field Fermi surface properties in the low-carrier heavy-fermion compound URu$$_2$$Si$$_2$$

Aoki, Dai*; Knebel, G.*; Sheikin, I.*; Hassinger, E.*; Malone, L.*; Matsuda, Tatsuma; Flouquet, J.*

We performed the Shubnikov-de Haas (SdH) experiments of the low-carrier heavy-fermion compound URu$$_2$$Si$$_2$$ at high fields up to 34T and at low temperatures down to 30 mK. All main SdH branches named $$alpha, beta$$ and $$gamma$$ and were observed for all the measured field-directions, indicating that they are attributed to the closed Fermi surfaces with nearly spherical shapes. An anomalous split of branch $$alpha$$ was detected for the field along the basal plane; the split immediately disappeared by tilting the field to [001] direction, implying a fingerprint of the hidden order state. High-field experiments reveal the complicated field-dependence of the SdH frequencies and the cyclotron masses due to the Zeeman spin-splitting associated with the Fermi surface reconstruction in the hidden order state with small carrier numbers. A new SdH branch named $$omega$$ with a large cyclotron mass of 25 $$m_0$$ was detected at high fields above 23T close to hidden order instabilities.

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Category:Physics, Multidisciplinary

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