Chemical Signature of the Superconducting Phase in the Nd-Ce-Cu-O System
The electron-doped material Nd$_{2-x}$Ce$_x$CuO$_4$ becomes superconducting with a Ce$^{4+}$ composition around 0.16, but only after removal of a minuscule amount of extraneous oxygen. This enigmatic behavior was addressed here. A small fraction of copper in the CuO$_2$ planes of Nd$_{2-x}$Ce$_x$CuO...
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| Veröffentlicht in: | Science (American Association for the Advancement of Science) 1994-07, Vol.265 (5168), p.73-74 |
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| container_issue | 5168 |
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| container_title | Science (American Association for the Advancement of Science) |
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| creator | Nath, Amar Kopelev, Nikolai S. Chechersky, Vladimir Peng, Jian-Liang Greene, Richard L. Beom-Hoan O Larkin, Michael I. Markert, John T. |
| description | The electron-doped material Nd$_{2-x}$Ce$_x$CuO$_4$ becomes superconducting with a Ce$^{4+}$ composition around 0.16, but only after removal of a minuscule amount of extraneous oxygen. This enigmatic behavior was addressed here. A small fraction of copper in the CuO$_2$ planes of Nd$_{2-x}$Ce$_x$CuO$_4$ was substituted by cobalt-57, which serves as a microprobe of the chemical environment. Deoxygenation brought about little change in the Mossbauer spectra both above and below the optimal superconducting concentration; however, for x = 0.16 a change was observed. In the latter, a major fraction of the magnetically split, five-coordinate species showed itself as a paramagnetically relaxed doublet upon deoxygenation. The abundance of the paramagnetically relaxed species corresponds closely to the diamagnetic volume fraction and thus provides a microscopic signature of the superconducting phase. |
| doi_str_mv | 10.1126/science.265.5168.73 |
| format | Article |
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This enigmatic behavior was addressed here. A small fraction of copper in the CuO$_2$ planes of Nd$_{2-x}$Ce$_x$CuO$_4$ was substituted by cobalt-57, which serves as a microprobe of the chemical environment. Deoxygenation brought about little change in the Mossbauer spectra both above and below the optimal superconducting concentration; however, for x = 0.16 a change was observed. In the latter, a major fraction of the magnetically split, five-coordinate species showed itself as a paramagnetically relaxed doublet upon deoxygenation. 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The abundance of the paramagnetically relaxed species corresponds closely to the diamagnetic volume fraction and thus provides a microscopic signature of the superconducting phase.</description><subject>Atoms</subject><subject>CERIUM COMPOUNDS</subject><subject>Condensed matter: electronic structure, electrical, magnetic, and optical properties</subject><subject>COPPER COMPOUNDS</subject><subject>CUPRATES</subject><subject>Cuprates superconductors (high tc and insulating parent compounds)</subject><subject>Deoxygenation</subject><subject>ELECTRIC CONDUCTIVITY</subject><subject>Electrical phases</subject><subject>ELECTRICAL PROPERTIES</subject><subject>Exact sciences and technology</subject><subject>High-Tc compounds</subject><subject>Ions</subject><subject>Materials</subject><subject>MATERIALS SCIENCE</subject><subject>MOESSBAUER EFFECT</subject><subject>NEODYMIUM COMPOUNDS</subject><subject>Other cuprates</subject><subject>Oxygen</subject><subject>OXYGEN COMPOUNDS</subject><subject>PHYSICAL PROPERTIES</subject><subject>Physics</subject><subject>Properties of type I and type II superconductors</subject><subject>Quadrupoles</subject><subject>RARE EARTH COMPOUNDS</subject><subject>Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.)</subject><subject>Sextets</subject><subject>Signatures</subject><subject>SUPERCONDUCTIVITY</subject><subject>SUPERCONDUCTORS</subject><subject>TRANSITION ELEMENT COMPOUNDS 360207 -- Ceramics, Cermets, & Refractories-- Superconducting Properties-- (1992-)</subject><issn>0036-8075</issn><issn>1095-9203</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1994</creationdate><recordtype>article</recordtype><recordid>eNqN0l2LEzEUBuAgilurv0CRQQS92KnJZPIxl-ug3YWyFarehjRzZpplmukmGXD_vaktKwu9KLkI5DwJh5MXobcEzwgp-JdgLDgDs4KzGSNczgR9hiYEVyyvCkyfownGlOcSC3aBXoVwh3GqVfQluiBCiJLLaoKu6w1srdF9trKd03H0kA1tFjeQrcYdeDO4ZjTRui77sdEBMuv-FW-bvIa8HvNltnoIEbav0YtW9wHeHPcp-vX928_6Ol8s5zf11SI3gsiY6wZjY9YEU7NuadGUqdOKA2cSDCskE6UuqWzWosGyqKRhVcsMXmtRClqUhtIp-nB4dwjRqjSDCGaTunRgouKCM16xhD4d0M4P9yOEqLY2GOh77WAYgxKUkqpiuEjy8iA73YOyrh2i16YDB173g4PWpuMrwphM3cnE8xM8rWY_xVP-8xOfSIQ_sdNjCOpmdXs2Xf4-m36dn0vlfPGEXp6iZuh76EClX6yXTzg9cOOHEDy0auftVvsHRbDaB1QdA6pSQNU-oPuxT9H748-M6y00_-8cE5nAxyPQIcWy9doZGx5dSQpRCJLYuwO7C3Hwj-XUWEk5oX8BdNnx8A</recordid><startdate>19940701</startdate><enddate>19940701</enddate><creator>Nath, Amar</creator><creator>Kopelev, Nikolai S.</creator><creator>Chechersky, Vladimir</creator><creator>Peng, Jian-Liang</creator><creator>Greene, Richard L.</creator><creator>Beom-Hoan O</creator><creator>Larkin, Michael I.</creator><creator>Markert, John T.</creator><general>American Society for the Advancement of Science</general><general>American Association for the Advancement of Science</general><scope>IQODW</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8GL</scope><scope>IBG</scope><scope>IOV</scope><scope>ISN</scope><scope>7X8</scope><scope>OTOTI</scope></search><sort><creationdate>19940701</creationdate><title>Chemical Signature of the Superconducting Phase in the Nd-Ce-Cu-O System</title><author>Nath, Amar ; Kopelev, Nikolai S. ; Chechersky, Vladimir ; Peng, Jian-Liang ; Greene, Richard L. ; Beom-Hoan O ; Larkin, Michael I. ; Markert, John T.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c718t-ad00ccb103cbf32d420396e658ec528574a438db7d08298c59f5c0ba747324c33</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1994</creationdate><topic>Atoms</topic><topic>CERIUM COMPOUNDS</topic><topic>Condensed matter: electronic structure, electrical, magnetic, and optical properties</topic><topic>COPPER COMPOUNDS</topic><topic>CUPRATES</topic><topic>Cuprates superconductors (high tc and insulating parent compounds)</topic><topic>Deoxygenation</topic><topic>ELECTRIC CONDUCTIVITY</topic><topic>Electrical phases</topic><topic>ELECTRICAL PROPERTIES</topic><topic>Exact sciences and technology</topic><topic>High-Tc compounds</topic><topic>Ions</topic><topic>Materials</topic><topic>MATERIALS SCIENCE</topic><topic>MOESSBAUER EFFECT</topic><topic>NEODYMIUM COMPOUNDS</topic><topic>Other cuprates</topic><topic>Oxygen</topic><topic>OXYGEN COMPOUNDS</topic><topic>PHYSICAL PROPERTIES</topic><topic>Physics</topic><topic>Properties of type I and type II superconductors</topic><topic>Quadrupoles</topic><topic>RARE EARTH COMPOUNDS</topic><topic>Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.)</topic><topic>Sextets</topic><topic>Signatures</topic><topic>SUPERCONDUCTIVITY</topic><topic>SUPERCONDUCTORS</topic><topic>TRANSITION ELEMENT COMPOUNDS 360207 -- Ceramics, Cermets, & Refractories-- Superconducting Properties-- (1992-)</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Nath, Amar</creatorcontrib><creatorcontrib>Kopelev, Nikolai S.</creatorcontrib><creatorcontrib>Chechersky, Vladimir</creatorcontrib><creatorcontrib>Peng, Jian-Liang</creatorcontrib><creatorcontrib>Greene, Richard L.</creatorcontrib><creatorcontrib>Beom-Hoan O</creatorcontrib><creatorcontrib>Larkin, Michael I.</creatorcontrib><creatorcontrib>Markert, John T.</creatorcontrib><collection>Pascal-Francis</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Gale In Context: High School</collection><collection>Gale In Context: Biography</collection><collection>Opposing Viewpoints in Context (Gale)</collection><collection>Gale In Context: Canada</collection><collection>MEDLINE - Academic</collection><collection>OSTI.GOV</collection><jtitle>Science (American Association for the Advancement of Science)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Nath, Amar</au><au>Kopelev, Nikolai S.</au><au>Chechersky, Vladimir</au><au>Peng, Jian-Liang</au><au>Greene, Richard L.</au><au>Beom-Hoan O</au><au>Larkin, Michael I.</au><au>Markert, John T.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Chemical Signature of the Superconducting Phase in the Nd-Ce-Cu-O System</atitle><jtitle>Science (American Association for the Advancement of Science)</jtitle><addtitle>Science</addtitle><date>1994-07-01</date><risdate>1994</risdate><volume>265</volume><issue>5168</issue><spage>73</spage><epage>74</epage><pages>73-74</pages><issn>0036-8075</issn><eissn>1095-9203</eissn><coden>SCIEAS</coden><abstract>The electron-doped material Nd$_{2-x}$Ce$_x$CuO$_4$ becomes superconducting with a Ce$^{4+}$ composition around 0.16, but only after removal of a minuscule amount of extraneous oxygen. 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| fulltext | fulltext |
| identifier | ISSN: 0036-8075 |
| ispartof | Science (American Association for the Advancement of Science), 1994-07, Vol.265 (5168), p.73-74 |
| issn | 0036-8075 1095-9203 |
| language | eng |
| recordid | cdi_osti_scitechconnect_6765695 |
| source | American Association for the Advancement of Science; Jstor Complete Legacy |
| subjects | Atoms CERIUM COMPOUNDS Condensed matter: electronic structure, electrical, magnetic, and optical properties COPPER COMPOUNDS CUPRATES Cuprates superconductors (high tc and insulating parent compounds) Deoxygenation ELECTRIC CONDUCTIVITY Electrical phases ELECTRICAL PROPERTIES Exact sciences and technology High-Tc compounds Ions Materials MATERIALS SCIENCE MOESSBAUER EFFECT NEODYMIUM COMPOUNDS Other cuprates Oxygen OXYGEN COMPOUNDS PHYSICAL PROPERTIES Physics Properties of type I and type II superconductors Quadrupoles RARE EARTH COMPOUNDS Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.) Sextets Signatures SUPERCONDUCTIVITY SUPERCONDUCTORS TRANSITION ELEMENT COMPOUNDS 360207 -- Ceramics, Cermets, & Refractories-- Superconducting Properties-- (1992-) |
| title | Chemical Signature of the Superconducting Phase in the Nd-Ce-Cu-O System |
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