Impurity Effects on the Electronic State in the Undoped (Ce-free) Superconductor T'-La^sub 1.8^Eu^sub 0.2^CuO^sub 4^ Studied by Muon Spin Relaxation
To investigate the electronic state in the undoped (Ce-free) superconductor T′-La1.8Eu0.2CuO4 (T′-LECO), we have performed muon spin relaxation measurements using impurity-substituted superconducting (SC) reduced samples of T′-La1.8Eu0.2Cu1−yMyO4 (M = Ni, Zn; y=0,0.005,0.01y=0,0.005,0.01) and also a...
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| Veröffentlicht in: | Journal of the Physical Society of Japan 2018-09, Vol.87 (9) |
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| container_title | Journal of the Physical Society of Japan |
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| creator | Kawamata, Takayuki Ohashi, Koki Takamatsu, Tomohisa Adachi, Tadashi Kato, Masatsune Watanabe, Isao Koike, Yoji |
| description | To investigate the electronic state in the undoped (Ce-free) superconductor T′-La1.8Eu0.2CuO4 (T′-LECO), we have performed muon spin relaxation measurements using impurity-substituted superconducting (SC) reduced samples of T′-La1.8Eu0.2Cu1−yMyO4 (M = Ni, Zn; y=0,0.005,0.01y=0,0.005,0.01) and also a non-SC as-grown sample of T′-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 T′-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 T′-cuprates has been discussed. |
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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 T′-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 T′-cuprates has been discussed.</description><identifier>ISSN: 0031-9015</identifier><identifier>EISSN: 1347-4073</identifier><language>eng</language><publisher>Tokyo: The Physical Society of Japan</publisher><subject>Cuprates ; Electron spin ; Electron states ; Impurities ; Impurity effects ; Magnetic fields ; Magnetic transitions ; Muon spin relaxation ; Phase separation ; Phase transitions ; Substitutes ; Superconductivity ; Transition temperature ; Zinc</subject><ispartof>Journal of the Physical Society of Japan, 2018-09, Vol.87 (9)</ispartof><rights>Copyright The Physical Society of Japan Sep 15, 2018</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780</link.rule.ids></links><search><creatorcontrib>Kawamata, Takayuki</creatorcontrib><creatorcontrib>Ohashi, Koki</creatorcontrib><creatorcontrib>Takamatsu, Tomohisa</creatorcontrib><creatorcontrib>Adachi, Tadashi</creatorcontrib><creatorcontrib>Kato, Masatsune</creatorcontrib><creatorcontrib>Watanabe, Isao</creatorcontrib><creatorcontrib>Koike, Yoji</creatorcontrib><title>Impurity Effects on the Electronic State in the Undoped (Ce-free) Superconductor T'-La^sub 1.8^Eu^sub 0.2^CuO^sub 4^ Studied by Muon Spin Relaxation</title><title>Journal of the Physical Society of Japan</title><description>To investigate the electronic state in the undoped (Ce-free) superconductor T′-La1.8Eu0.2CuO4 (T′-LECO), we have performed muon spin relaxation measurements using impurity-substituted superconducting (SC) reduced samples of T′-La1.8Eu0.2Cu1−yMyO4 (M = Ni, Zn; y=0,0.005,0.01y=0,0.005,0.01) and also a non-SC as-grown sample of T′-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 T′-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 T′-cuprates has been discussed.</description><subject>Cuprates</subject><subject>Electron spin</subject><subject>Electron states</subject><subject>Impurities</subject><subject>Impurity effects</subject><subject>Magnetic fields</subject><subject>Magnetic transitions</subject><subject>Muon spin relaxation</subject><subject>Phase separation</subject><subject>Phase transitions</subject><subject>Substitutes</subject><subject>Superconductivity</subject><subject>Transition temperature</subject><subject>Zinc</subject><issn>0031-9015</issn><issn>1347-4073</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNqNjd1KwzAYhoMoWKf38IEH6kFG0iZsOy4VhYlgt9OOrP2KGTWJ-QF3H16wYXoBHr3P98PznpGCV2JBBVtU56RgrOJ0xbi8JFchHBgrJS9FQb6fP1zyOh6hGUfsYwBrIL4jNFOevDW6hzaqiKB_91szWIcD3NdIR4_4AG1y6HtrhtRH62FzR9eqC2kPfL7smnRCNi-7Or2eWHTZmAadJfsjvKRc2Lpsf8NJfamorbkmF6OaAt785YzcPjab-ok6bz8Thrg72ORNPu1KzpmQy5WU1f--fgDAW1ZQ</recordid><startdate>20180915</startdate><enddate>20180915</enddate><creator>Kawamata, Takayuki</creator><creator>Ohashi, Koki</creator><creator>Takamatsu, Tomohisa</creator><creator>Adachi, Tadashi</creator><creator>Kato, Masatsune</creator><creator>Watanabe, Isao</creator><creator>Koike, Yoji</creator><general>The Physical Society of Japan</general><scope>7U5</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope></search><sort><creationdate>20180915</creationdate><title>Impurity Effects on the Electronic State in the Undoped (Ce-free) Superconductor T'-La^sub 1.8^Eu^sub 0.2^CuO^sub 4^ Studied by Muon Spin Relaxation</title><author>Kawamata, Takayuki ; Ohashi, Koki ; Takamatsu, Tomohisa ; Adachi, Tadashi ; Kato, Masatsune ; Watanabe, Isao ; Koike, Yoji</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-proquest_journals_21104589553</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Cuprates</topic><topic>Electron spin</topic><topic>Electron states</topic><topic>Impurities</topic><topic>Impurity effects</topic><topic>Magnetic fields</topic><topic>Magnetic transitions</topic><topic>Muon spin relaxation</topic><topic>Phase separation</topic><topic>Phase transitions</topic><topic>Substitutes</topic><topic>Superconductivity</topic><topic>Transition temperature</topic><topic>Zinc</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Kawamata, Takayuki</creatorcontrib><creatorcontrib>Ohashi, Koki</creatorcontrib><creatorcontrib>Takamatsu, Tomohisa</creatorcontrib><creatorcontrib>Adachi, Tadashi</creatorcontrib><creatorcontrib>Kato, Masatsune</creatorcontrib><creatorcontrib>Watanabe, Isao</creatorcontrib><creatorcontrib>Koike, Yoji</creatorcontrib><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of the Physical Society of Japan</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Kawamata, Takayuki</au><au>Ohashi, Koki</au><au>Takamatsu, Tomohisa</au><au>Adachi, Tadashi</au><au>Kato, Masatsune</au><au>Watanabe, Isao</au><au>Koike, Yoji</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Impurity Effects on the Electronic State in the Undoped (Ce-free) Superconductor T'-La^sub 1.8^Eu^sub 0.2^CuO^sub 4^ Studied by Muon Spin Relaxation</atitle><jtitle>Journal of the Physical Society of Japan</jtitle><date>2018-09-15</date><risdate>2018</risdate><volume>87</volume><issue>9</issue><issn>0031-9015</issn><eissn>1347-4073</eissn><abstract>To investigate the electronic state in the undoped (Ce-free) superconductor T′-La1.8Eu0.2CuO4 (T′-LECO), we have performed muon spin relaxation measurements using impurity-substituted superconducting (SC) reduced samples of T′-La1.8Eu0.2Cu1−yMyO4 (M = Ni, Zn; y=0,0.005,0.01y=0,0.005,0.01) and also a non-SC as-grown sample of T′-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 T′-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 T′-cuprates has been discussed.</abstract><cop>Tokyo</cop><pub>The Physical Society of Japan</pub></addata></record> |
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| subjects | Cuprates Electron spin Electron states Impurities Impurity effects Magnetic fields Magnetic transitions Muon spin relaxation Phase separation Phase transitions Substitutes Superconductivity Transition temperature Zinc |
| title | Impurity Effects on the Electronic State in the Undoped (Ce-free) Superconductor T'-La^sub 1.8^Eu^sub 0.2^CuO^sub 4^ Studied by Muon Spin Relaxation |
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