Synthesis and Characterization of Superconducting Ca1−xNaxFFeAs
A representative of the fluoride-containing iron pnictide high-temperature superconductors, namely CaFFeAs, was doped with sodium up to the composition Ca0.86Na0.14FFeAs for the first time. Single crystals with an edge length in the range of 0.1 - 2.0 mm were obtained via solid-state and flux synthe...
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| Veröffentlicht in: | Materials 2014-03, Vol.7 (3), p.1984-1994 |
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| container_end_page | 1994 |
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| container_issue | 3 |
| container_start_page | 1984 |
| container_title | Materials |
| container_volume | 7 |
| creator | Wolff, Klaus K Shlyk, Larysa Bischoff, Markus Rose, Eva Niewa, Rainer Schleid, Thomas |
| description | A representative of the fluoride-containing iron pnictide high-temperature superconductors, namely CaFFeAs, was doped with sodium up to the composition Ca0.86Na0.14FFeAs for the first time. Single crystals with an edge length in the range of 0.1 - 2.0 mm were obtained via solid-state and flux syntheses, respectively. The composition of the crystals was verified by means of single crystal X-ray diffractometry and energy dispersive X-ray spectroscopy (EDX). Measurements of the electrical resistivity, as well as the magnetization on a crystal of Ca0.89Na0.11FFeAs both show a transition to the superconducting state on cooling to 34.5 K. Investigations of the upper critical fields reveal an anisotropy ratio of about five. The lattice parameters and molar volumes increase with rising sodium content. This effect is clearly observable for the c-axis and the volume, whereas the increase of the a-axis is rather minor. |
| doi_str_mv | 10.3390/ma7031984 |
| format | Article |
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Single crystals with an edge length in the range of 0.1 - 2.0 mm were obtained via solid-state and flux syntheses, respectively. The composition of the crystals was verified by means of single crystal X-ray diffractometry and energy dispersive X-ray spectroscopy (EDX). Measurements of the electrical resistivity, as well as the magnetization on a crystal of Ca0.89Na0.11FFeAs both show a transition to the superconducting state on cooling to 34.5 K. Investigations of the upper critical fields reveal an anisotropy ratio of about five. The lattice parameters and molar volumes increase with rising sodium content. This effect is clearly observable for the c-axis and the volume, whereas the increase of the a-axis is rather minor.</description><identifier>ISSN: 1996-1944</identifier><identifier>EISSN: 1996-1944</identifier><identifier>DOI: 10.3390/ma7031984</identifier><identifier>PMID: 28788551</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Crystal structure ; Crystals ; Diffraction ; Electrical resistivity ; Electrons ; Fluorides ; Fluorine ; Lattice parameters ; Magnetization ; Radiation ; Single crystals ; Sodium ; Spectrum analysis ; Superconductivity ; Temperature</subject><ispartof>Materials, 2014-03, Vol.7 (3), p.1984-1994</ispartof><rights>Copyright MDPI AG 2014</rights><rights>2014 by the authors. 2014</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c479t-758dac0b8696d4201e4fd1707a358994a4a058403a4799e552e93e6670204ef83</citedby><cites>FETCH-LOGICAL-c479t-758dac0b8696d4201e4fd1707a358994a4a058403a4799e552e93e6670204ef83</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC5453247/pdf/$$EPDF$$P50$$Gpubmedcentral$$Hfree_for_read</linktopdf><linktohtml>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC5453247/$$EHTML$$P50$$Gpubmedcentral$$Hfree_for_read</linktohtml><link.rule.ids>230,314,727,780,784,885,27923,27924,53790,53792</link.rule.ids></links><search><creatorcontrib>Wolff, Klaus K</creatorcontrib><creatorcontrib>Shlyk, Larysa</creatorcontrib><creatorcontrib>Bischoff, Markus</creatorcontrib><creatorcontrib>Rose, Eva</creatorcontrib><creatorcontrib>Niewa, Rainer</creatorcontrib><creatorcontrib>Schleid, Thomas</creatorcontrib><title>Synthesis and Characterization of Superconducting Ca1−xNaxFFeAs</title><title>Materials</title><description>A representative of the fluoride-containing iron pnictide high-temperature superconductors, namely CaFFeAs, was doped with sodium up to the composition Ca0.86Na0.14FFeAs for the first time. Single crystals with an edge length in the range of 0.1 - 2.0 mm were obtained via solid-state and flux syntheses, respectively. The composition of the crystals was verified by means of single crystal X-ray diffractometry and energy dispersive X-ray spectroscopy (EDX). Measurements of the electrical resistivity, as well as the magnetization on a crystal of Ca0.89Na0.11FFeAs both show a transition to the superconducting state on cooling to 34.5 K. Investigations of the upper critical fields reveal an anisotropy ratio of about five. The lattice parameters and molar volumes increase with rising sodium content. This effect is clearly observable for the c-axis and the volume, whereas the increase of the a-axis is rather minor.</description><subject>Crystal structure</subject><subject>Crystals</subject><subject>Diffraction</subject><subject>Electrical resistivity</subject><subject>Electrons</subject><subject>Fluorides</subject><subject>Fluorine</subject><subject>Lattice parameters</subject><subject>Magnetization</subject><subject>Radiation</subject><subject>Single crystals</subject><subject>Sodium</subject><subject>Spectrum analysis</subject><subject>Superconductivity</subject><subject>Temperature</subject><issn>1996-1944</issn><issn>1996-1944</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNqFkc9KAzEQh4MottQefIMFL3qoJpv_F6EUq0LRQ_UcprvZdkub1GRXWp_As4_ok7jSUtSLc5mB-fgY5ofQKcGXlGp8tQSJKdGKHaA20Vr0iGbs8MfcQt0Y57gpSolK9TFqpUoqxTlpo_5446qZjWVMwOXJYAYBssqG8g2q0rvEF8m4XtmQeZfXWVW6aTIA8vn-sX6A9XBo-_EEHRWwiLa76x30PLx5Gtz1Ro-394P-qJcxqaue5CqHDE-U0CJnKSaWFTmRWALlSmsGDDBXDFNocG05T62mVgiJU8xsoWgHXW-9q3qytHlmXRVgYVahXELYGA-l-b1x5cxM_avhjNOUyUZwvhME_1LbWJllGTO7WICzvo6G6FRyLYSg_6NCEs4xobhBz_6gc18H13zCEJ4qTbnguqEutlQWfIzBFvu7CTbfMZp9jPQLbL-Mqg</recordid><startdate>20140307</startdate><enddate>20140307</enddate><creator>Wolff, Klaus K</creator><creator>Shlyk, Larysa</creator><creator>Bischoff, Markus</creator><creator>Rose, Eva</creator><creator>Niewa, Rainer</creator><creator>Schleid, Thomas</creator><general>MDPI AG</general><general>MDPI</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>JG9</scope><scope>KB.</scope><scope>PDBOC</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>7U5</scope><scope>L7M</scope><scope>7X8</scope><scope>5PM</scope></search><sort><creationdate>20140307</creationdate><title>Synthesis and Characterization of Superconducting Ca1−xNaxFFeAs</title><author>Wolff, Klaus K ; 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Single crystals with an edge length in the range of 0.1 - 2.0 mm were obtained via solid-state and flux syntheses, respectively. The composition of the crystals was verified by means of single crystal X-ray diffractometry and energy dispersive X-ray spectroscopy (EDX). Measurements of the electrical resistivity, as well as the magnetization on a crystal of Ca0.89Na0.11FFeAs both show a transition to the superconducting state on cooling to 34.5 K. Investigations of the upper critical fields reveal an anisotropy ratio of about five. The lattice parameters and molar volumes increase with rising sodium content. This effect is clearly observable for the c-axis and the volume, whereas the increase of the a-axis is rather minor.</abstract><cop>Basel</cop><pub>MDPI AG</pub><pmid>28788551</pmid><doi>10.3390/ma7031984</doi><tpages>11</tpages><oa>free_for_read</oa></addata></record> |
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| source | PubMed Central Open Access; MDPI - Multidisciplinary Digital Publishing Institute; EZB-FREE-00999 freely available EZB journals; PubMed Central; Free Full-Text Journals in Chemistry |
| subjects | Crystal structure Crystals Diffraction Electrical resistivity Electrons Fluorides Fluorine Lattice parameters Magnetization Radiation Single crystals Sodium Spectrum analysis Superconductivity Temperature |
| title | Synthesis and Characterization of Superconducting Ca1−xNaxFFeAs |
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