Magnetic Susceptibility and Spin Fluctuations in the Nonsuperconducting Phase of PuCoGa5
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Within the Hubbard model with allowance for Hund’s and spin–orbit interactions, the concepts of thermal spin fluctuations in a strongly correlated system of f electrons in PuCoGa5 are developed. The effect of fluctuations of the spin magnetic moments of different orbitals on the spin–orbit splitting of the f electron spectrum is considered. The mean square magnetic moment obtained in this case makes it possible to describe the observed temperature dependence of the magnetic susceptibility (χ(T)) of PuCoGa5 near and above the electron pairing temperature. Estimates of the radius of spin correlations correspond in order of magnitude to the sizes of Cooper pairs in superconductors with the d symmetry of the order parameter. In the high-temperature region, the magnetic susceptibility obeys the Curie–Weiss law. With decreasing temperature, when approaching the pairing temperature, the ferromagnetic instability is suppressed and the temperature maximum of χ(T) appears.
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