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Revising the 4${it f}$ symmetry in CeCu$$_{2}$$Ge$$_{2}$$; Soft X-ray absorption and hard X-ray photoemission spectroscopy

軟X線吸収分光と硬X線光電子分光によるCeCu$$_{2}$$Ge$$_{2}$$の4${it f}$対称性の決定

荒谷 秀和*; 中谷 泰博*; 藤原 秀紀*; 川田 萌樹*; 金井 惟奈*; 山神 光平*; 藤岡 修平*; 濱本 諭*; 久我 健太郎*; 木須 孝幸*; 山崎 篤志*; 東谷 篤志*; 門野 利治*; 今田 真*; 田中 新*; 玉作 賢治*; 矢橋 牧名*; 石川 哲也*; 保井 晃*; 斎藤 祐児; 鳴海 康雄*; 金道 浩一*; 海老原 孝雄*; 関山 明*

Aratani, Hidekazu*; Nakatani, Yasuhiro*; Fujiwara, Hidenori*; Kawada, Moeki*; Kanai, Yuina*; Yamagami, Kohei*; Fujioka, Shuhei*; Hamamoto, Satoru*; Kuga, Kentaro*; Kiss, Takayuki*; Yamasaki, Atsushi*; Higashiya, Atsushi*; Kadono, Toshiharu*; Imada, Shin*; Tanaka, Arata*; Tamasaku, Kenji*; Yabashi, Makina*; Ishikawa, Tetsuya*; Yasui, Akira*; Saito, Yuji; Narumi, Yasuo*; Kindo, Koichi*; Ebihara, Takao*; Sekiyama, Akira*

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 $$Sigmamathchar`-{rm type}$$ 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.

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パーセンタイル:59.26

分野:Materials Science, Multidisciplinary

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