Distinct variation of electronic states due to annealing in
-type La
Eu
CuO
and Nd
CuO
アニールによる
タイプ銅酸化物La
Eu
CuO
及びNd
CuO
の電子状態変化
浅野 駿*; 石井 賢司*; 松村 大樹
; 辻 卓也
; 工藤 康太*; 谷口 貴紀*; 齋藤 真*; 春原 稔樹*; 川股 隆行*; 小池 洋二*; 藤田 全基*
Asano, Shun*; Ishii, Kenji*; Matsumura, Daiju; Tsuji, Takuya; Kudo, Kota*; Taniguchi, Takanori*; Saito, Shin*; Sunohara, Toshiki*; Kawamata, Takayuki*; Koike, Yoji*; Fujita, Masaki*
We performed Cu K-edge X-ray absorption fine-structure measurements on
-type La
Eu
CuO
(LECO) and Nd
CuO
(NCO) to investigate the variation in the electronic state associated with the emergence of superconductivity due to annealing. The X-ray absorption near-edge structure spectra of as-sintered (AS) LECO are quite similar to those of AS NCO, indicating that the ground state of AS LECO is a Mott insulator. The electron density after annealing
was evaluated for both superconducting LECO and nonsuperconducting NCO and was found to be 0.40 and 0.05 electron per Cu atom, respectively. In LECO but not in NCO, extended X-ray absorption fine-structure analysis revealed a reduction in the strength of the Cu-O bond in the CuO
plane due to annealing, which is consistent with the screening effect on phonons in the metallic state. The origin of the difference in doping processes due to annealing is discussed in relation to the size of the charge-transfer gap.