First Observation of Quantum Oscillations in the Ferromagnetic Superconductor UCoGe

Details First Observation of Quantum Oscillations in the Ferromagnetic Superconductor UCoGe First Observation of Quantum Oscillations in the Ferromagnetic Superconductor UCoGe

2010-11-21

arxiv.org/abs/1011.4664v1

J. Phys. Soc. Jpn. 80 (2011) 013705

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures, accepted for publication in J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.80.013705

We succeeded in growing high quality single crystals of the ferromagnetic superconductor UCoGe and measured the magnetoresistance at fields up to 34T. The Shubnikov-de Haas signal was observed for the first time in a U-111 system (UTGe, UTSi, T: transition metal). A small pocket Fermi surface (F~1kT) with large cyclotron effective mass 25m0 was detected at high fields above 22T, implying that UCoGe is a low carrier system accompanyed with heavy quasi-particles. The observed frequency decreases with increasing fields, indicating that the volume of detected Fermi surface changes nonlinearly with field. The cyclotron mass also decreases, which is consistent with the decrease of the A coefficient of resistivity.

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