Impurity effects on the electronic state in the undoped (Ce-free) superconductor T¤-La1.8Eu0.2CuO4 studied by muon spin relaxation

Takayuki Kawamata, Koki Ohashi, Tomohisa Takamatsu, Tadashi Adachi, Masatsune Kato, Isao Watanabe, Yoji Koike

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Abstract

To investigate the electronic state in the undoped (Ce-free) superconductor TA-La1.8Eu0.2CuO4 (TA-LECO), we have performed muon spin relaxation measurements using impurity-substituted superconducting (SC) reduced samples of TA-La1.8Eu0.2Cu1yMyO4 (M = Ni, Zn; y ¼ 0; 0:005; 0:01) and also a non-SC as-grown sample of TA-LECO. It has been found that phase separation into SC and magnetically ordered regions takes place and that no magnetic order is developed around M in the SC regions of the M-substituted reduced samples. The magnetic transition temperature in the magnetically ordered regions has been found to increase and decrease with the Ni and Zn substitutions, respectively. Accordingly, it has been concluded that the electronic state in the SC regions of TA-LECO is similar to that in overdoped T-La2xSrxCuO4 and understood as a strongly correlated itinerant electron system, while the magnetically ordered regions are due to localized Cu spins. The role of the reduction annealing in the appearance of superconductivity in TA-cuprates has been discussed.

Original languageEnglish
Article number094717
Journaljournal of the physical society of japan
Volume87
Issue number9
DOIs
Publication statusPublished - 2018 Jan 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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