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Ferromagnetic superconductivity mediated by pressure-enhanced spin fluctuation developed around the phase boundary of FM1 and FM2 in UGe$$_2$$

Tateiwa, Naoyuki   ; Haga, Yoshinori   ; Yamamoto, Etsuji  

We study the dynamical magnetic property under high pressure in uranium ferromagnetic superconductor UGe$$_2$$ from the analysis of magnetic data with Takahashi's spin fluctuation theory. We determined the pressure dependencies of spin fluctuation parameters $$T_0$$ and $$T_{rm A}$$, the widths of the spin fluctuation spectrum in the energy and the momentum spaces, respectively. $$T_0$$ and $$T_{rm A}$$ show anomalous behavior around pressure region where the superconductivity appears. We suggests that the superconductivity in UGe$$_2$$ is mediated by pressure-enhanced spin fluctuation developed around the phase boundary of two ferromagnetic phases FM1 and FM2.

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