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

doi:10.7566/JPSJ.87.094717

Impurity effects on the electronic state in the undoped (Ce-free) superconductor T¤-La_1.8Eu_0.2CuO₄ studied by muon spin relaxation

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

ENG - Applied Physics

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

To investigate the electronic state in the undoped (Ce-free) superconductor TA-La_1.8Eu_0.2CuO₄ (TA-LECO), we have performed muon spin relaxation measurements using impurity-substituted superconducting (SC) reduced samples of TA-La_1.8Eu_0.2Cu₁−_yM_yO₄ (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-La₂−_xSr_xCuO₄ 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 language	English
Article number	094717
Journal	journal of the physical society of japan
Volume	87
Issue number	9
DOIs	https://doi.org/10.7566/JPSJ.87.094717
Publication status	Published - 2018

ASJC Scopus subject areas

Physics and Astronomy(all)

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Impurity effects on the electronic state in the undoped (Ce-free) superconductor T¤-La_1.8Eu_0.2CuO₄ studied by muon spin relaxation. / Kawamata, Takayuki; Ohashi, Koki; Takamatsu, Tomohisa; Adachi, Tadashi; Kato, Masatsune; Watanabe, Isao; Koike, Yoji.

In: journal of the physical society of japan, Vol. 87, No. 9, 094717, 2018.

Research output: Contribution to journal › Article › peer-review

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

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-La1.8Eu0.2Cu1−yMyO4 (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-La2−xSrxCuO4 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.",

author = "Takayuki Kawamata and Koki Ohashi and Tomohisa Takamatsu and Tadashi Adachi and Masatsune Kato and Isao Watanabe and Yoji Koike",

note = "Funding Information: Acknowledgments This work was supported by JSPS KAKENHI Grant Number 17H02915.",

year = "2018",

doi = "10.7566/JPSJ.87.094717",

language = "English",

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journal = "Journal of the Physical Society of Japan",

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T1 - Impurity effects on the electronic state in the undoped (Ce-free) superconductor T¤-La1.8Eu0.2CuO4 studied by muon spin relaxation

AU - Kawamata, Takayuki

AU - Ohashi, Koki

AU - Takamatsu, Tomohisa

AU - Adachi, Tadashi

AU - Kato, Masatsune

AU - Watanabe, Isao

AU - Koike, Yoji

N1 - Funding Information: Acknowledgments This work was supported by JSPS KAKENHI Grant Number 17H02915.

PY - 2018

Y1 - 2018

N2 - 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-La1.8Eu0.2Cu1−yMyO4 (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-La2−xSrxCuO4 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.

AB - 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-La1.8Eu0.2Cu1−yMyO4 (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-La2−xSrxCuO4 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.

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Impurity effects on the electronic state in the undoped (Ce-free) superconductor T¤-La_1.8Eu_0.2CuO₄ studied by muon spin relaxation

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