Abstract
The Fermi surface of PuIn3 is investigated using flux-grown single crystals. Shubnikov-de Haas (SdH) oscillations were detected by means of the skin-depth measurement using a proximity-detector-oscillator circuit. Angular dependence of the SdH frequency which corresponds to the extremal cross-sectional area of Fermi surface agrees well with the previous magnetic susceptibility measurement using conventional field-modulation method. The SdH oscillation suddenly vanishes when the magnetic field is tilted from the cubic [111] direction.
Highlights
Rare-earth and actinide compounds are extensively studied because of their unusual behavior including heavy fermion formation and its superconductivity, various magnetic / multipolar orderings or Kondo-insulating behavior
The Wigner-Seitz radius of plutonium at room temperature is slightly larger than neptunium where 5f electrons are almost delocalized
In order to avoid the accumulation of radiation damage due to alpha decay of 239Pu, the flux grown crystals were transported to the measurement facility in a few hours
Summary
Rare-earth and actinide compounds are extensively studied because of their unusual behavior including heavy fermion formation and its superconductivity, various magnetic / multipolar orderings or Kondo-insulating behavior. While the 4f electrons in rare-earth elements can be regarded as localized electrons except for Ce and Yb, itinerant character is dominant in light actinide elements, as demonstrated in the Wigner-Seitz radius determined experimentally for light actinide elemental metals. This is most likely due to the larger spatial extent of the wave function of 5f electrons compared to that of 4f electrons. The Wigner-Seitz radius of plutonium at room temperature is slightly larger than neptunium where 5f electrons are almost delocalized. PuIn3 crystallizes in the cubic AuCu3-type crystal structure This earlier study reported that this compound shows a heavy fermion behavior. Shubnikov-de Haas Oscillation in PuIn3 – Yoshinori Haga et al
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