軟X線吸収分光と硬X線光電子分光によるCeCu2Ge2の4f対称性の決定

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  • Revising the 4f symmetry in CeCu2Ge2; Soft X-ray absorption and hard X-ray photoemission spectroscopy

抄録

We present a detailed study on the $4f$ ground state symmetry of the pressure-induced superconductor CeCu$_2$Ge$_2$ probed by soft X-ray absorption and hard X-ray photoemission spectroscopy. The revised Ce $4f$ ground states are determined as $|{\Gamma_7}\rangle=\sqrt{0.45}|{J_{z}=\pm \frac{5}{2}}\rangle - \sqrt{0.55}|{\mp \frac{3}{2}}\rangle$ with $\Sigma\mathchar`-{\rm type}$ in-plane rotational symmetry. This gives an in-plane magnetic moment consistent with the antiferromagnetic moment as reported in neutron measurements. Since the in-plane symmetry is the same as that for the superconductor CeCu$_2$Si$_2$, we propose that the charge distribution along the $c$-axis plays an essential role in driving the system into a superconducting phase.

収録刊行物

  • Physical Review B

    Physical Review B 98 (12), 121113_1-121113_6, 2018-09

    American Physical Society

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