Superconductivity in lanthanum barium cuprate perovskites
Samples in the system Ba 2− x La 1+ x Cu 3O 7−δ (0.0 ≤ x ≤ 0.5; 0 < δ < 0.25) have been prepared and characterized by X-ray powder diffraction, magnetic susceptibility, electrical resistivity, and for x = 0.5 powder neutron diffraction. This neutron diffraction study on Ba 1.5La 1.5Cu 3O 7.25...
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| Veröffentlicht in: | Journal of crystal growth 1987-12, Vol.85 (4), p.632-638 |
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| container_title | Journal of crystal growth |
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| creator | Sunshine, S.A. Schneemeyer, L.F. Waszczak, J.V. Murphy, D.W. Miraglia, S. Santoro, A. Beech, F. |
| description | Samples in the system Ba
2−
x
La
1+
x
Cu
3O
7−δ (0.0 ≤
x ≤ 0.5; 0 < δ < 0.25) have been prepared and characterized by X-ray powder diffraction, magnetic susceptibility, electrical resistivity, and for
x = 0.5 powder neutron diffraction. This neutron diffraction study on Ba
1.5La
1.5Cu
3O
7.25 indicates that the structure is similar to the 92 K superconductor Ba
2YCu
3O
7 with two exceptions. First, the “Ba site” contains 75% Ba and 25% La and second, the symmetry is tetragonal. At
x = 0.5 the material is a semiconductor, but as
x decreases metallic behavior and superconductivity are observed. Compositions with
x < 0.2 contain traces of BaCuO
2, but exhibit
T
onset
c ≈ 90 K and
R = 0 near 80 K. For
x = 0.2−0.3,
T
onset
c ≈ 60 K and
R = 0 near 50 K are observed . For
x ≤ 0.1 orthorhombic symmetry is observed. These results provide further evidence that oxygen stoichiometry and details of the oxygen ordering are important to superconductivity. |
| doi_str_mv | 10.1016/0022-0248(87)90036-4 |
| format | Article |
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2−
x
La
1+
x
Cu
3O
7−δ (0.0 ≤
x ≤ 0.5; 0 < δ < 0.25) have been prepared and characterized by X-ray powder diffraction, magnetic susceptibility, electrical resistivity, and for
x = 0.5 powder neutron diffraction. This neutron diffraction study on Ba
1.5La
1.5Cu
3O
7.25 indicates that the structure is similar to the 92 K superconductor Ba
2YCu
3O
7 with two exceptions. First, the “Ba site” contains 75% Ba and 25% La and second, the symmetry is tetragonal. At
x = 0.5 the material is a semiconductor, but as
x decreases metallic behavior and superconductivity are observed. Compositions with
x < 0.2 contain traces of BaCuO
2, but exhibit
T
onset
c ≈ 90 K and
R = 0 near 80 K. For
x = 0.2−0.3,
T
onset
c ≈ 60 K and
R = 0 near 50 K are observed . For
x ≤ 0.1 orthorhombic symmetry is observed. These results provide further evidence that oxygen stoichiometry and details of the oxygen ordering are important to superconductivity.</description><identifier>ISSN: 0022-0248</identifier><identifier>EISSN: 1873-5002</identifier><identifier>DOI: 10.1016/0022-0248(87)90036-4</identifier><language>eng</language><publisher>Elsevier B.V</publisher><ispartof>Journal of crystal growth, 1987-12, Vol.85 (4), p.632-638</ispartof><rights>1987</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c366t-1f9ba0e0bd1662d1d1b904bca124c8cb15e9135101b731352cb073180ed395113</citedby><cites>FETCH-LOGICAL-c366t-1f9ba0e0bd1662d1d1b904bca124c8cb15e9135101b731352cb073180ed395113</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/0022-0248(87)90036-4$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3548,27922,27923,45993</link.rule.ids></links><search><creatorcontrib>Sunshine, S.A.</creatorcontrib><creatorcontrib>Schneemeyer, L.F.</creatorcontrib><creatorcontrib>Waszczak, J.V.</creatorcontrib><creatorcontrib>Murphy, D.W.</creatorcontrib><creatorcontrib>Miraglia, S.</creatorcontrib><creatorcontrib>Santoro, A.</creatorcontrib><creatorcontrib>Beech, F.</creatorcontrib><title>Superconductivity in lanthanum barium cuprate perovskites</title><title>Journal of crystal growth</title><description>Samples in the system Ba
2−
x
La
1+
x
Cu
3O
7−δ (0.0 ≤
x ≤ 0.5; 0 < δ < 0.25) have been prepared and characterized by X-ray powder diffraction, magnetic susceptibility, electrical resistivity, and for
x = 0.5 powder neutron diffraction. This neutron diffraction study on Ba
1.5La
1.5Cu
3O
7.25 indicates that the structure is similar to the 92 K superconductor Ba
2YCu
3O
7 with two exceptions. First, the “Ba site” contains 75% Ba and 25% La and second, the symmetry is tetragonal. At
x = 0.5 the material is a semiconductor, but as
x decreases metallic behavior and superconductivity are observed. Compositions with
x < 0.2 contain traces of BaCuO
2, but exhibit
T
onset
c ≈ 90 K and
R = 0 near 80 K. For
x = 0.2−0.3,
T
onset
c ≈ 60 K and
R = 0 near 50 K are observed . For
x ≤ 0.1 orthorhombic symmetry is observed. These results provide further evidence that oxygen stoichiometry and details of the oxygen ordering are important to superconductivity.</description><issn>0022-0248</issn><issn>1873-5002</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1987</creationdate><recordtype>article</recordtype><recordid>eNqNkE9LxDAQxYMouK5-Aw89iR6qM02bNhdBxH-w4EE9hySdxehuW5N0Yb-92V3xKJ7ewPzeY-YxdopwiYDiCqAocijK5rypLyQAF3m5xybY1Dyv0nKfTX6RQ3YUwgdA8iFMmHwZB_K279rRRrdycZ25LlvoLr7rblxmRnuXxI6D15GyxPar8OkihWN2MNeLQCc_OmVv93evt4_57Pnh6fZmllsuRMxxLo0GAtOiEEWLLRoJpbEai9I21mBFEnmV_jA1T0NhDaShAWq5rBD5lJ3tcgfff40Uolq6YGmRbqR-DKoohZRc1P8Ca7EFyx1ofR-Cp7kavFtqv1YIalOo2rSlNm2pplbbQlWZbNc7G6VvV468CtZRZ6l1nmxUbe_-DvgGs7p78w</recordid><startdate>19871201</startdate><enddate>19871201</enddate><creator>Sunshine, S.A.</creator><creator>Schneemeyer, L.F.</creator><creator>Waszczak, J.V.</creator><creator>Murphy, D.W.</creator><creator>Miraglia, S.</creator><creator>Santoro, A.</creator><creator>Beech, F.</creator><general>Elsevier B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QQ</scope><scope>8FD</scope><scope>JG9</scope><scope>7SR</scope><scope>H8D</scope><scope>L7M</scope></search><sort><creationdate>19871201</creationdate><title>Superconductivity in lanthanum barium cuprate perovskites</title><author>Sunshine, S.A. ; Schneemeyer, L.F. ; Waszczak, J.V. ; Murphy, D.W. ; Miraglia, S. ; Santoro, A. ; Beech, F.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c366t-1f9ba0e0bd1662d1d1b904bca124c8cb15e9135101b731352cb073180ed395113</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1987</creationdate><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sunshine, S.A.</creatorcontrib><creatorcontrib>Schneemeyer, L.F.</creatorcontrib><creatorcontrib>Waszczak, J.V.</creatorcontrib><creatorcontrib>Murphy, D.W.</creatorcontrib><creatorcontrib>Miraglia, S.</creatorcontrib><creatorcontrib>Santoro, A.</creatorcontrib><creatorcontrib>Beech, F.</creatorcontrib><collection>CrossRef</collection><collection>Ceramic Abstracts</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Engineered Materials Abstracts</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of crystal growth</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Sunshine, S.A.</au><au>Schneemeyer, L.F.</au><au>Waszczak, J.V.</au><au>Murphy, D.W.</au><au>Miraglia, S.</au><au>Santoro, A.</au><au>Beech, F.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Superconductivity in lanthanum barium cuprate perovskites</atitle><jtitle>Journal of crystal growth</jtitle><date>1987-12-01</date><risdate>1987</risdate><volume>85</volume><issue>4</issue><spage>632</spage><epage>638</epage><pages>632-638</pages><issn>0022-0248</issn><eissn>1873-5002</eissn><abstract>Samples in the system Ba
2−
x
La
1+
x
Cu
3O
7−δ (0.0 ≤
x ≤ 0.5; 0 < δ < 0.25) have been prepared and characterized by X-ray powder diffraction, magnetic susceptibility, electrical resistivity, and for
x = 0.5 powder neutron diffraction. This neutron diffraction study on Ba
1.5La
1.5Cu
3O
7.25 indicates that the structure is similar to the 92 K superconductor Ba
2YCu
3O
7 with two exceptions. First, the “Ba site” contains 75% Ba and 25% La and second, the symmetry is tetragonal. At
x = 0.5 the material is a semiconductor, but as
x decreases metallic behavior and superconductivity are observed. Compositions with
x < 0.2 contain traces of BaCuO
2, but exhibit
T
onset
c ≈ 90 K and
R = 0 near 80 K. For
x = 0.2−0.3,
T
onset
c ≈ 60 K and
R = 0 near 50 K are observed . For
x ≤ 0.1 orthorhombic symmetry is observed. These results provide further evidence that oxygen stoichiometry and details of the oxygen ordering are important to superconductivity.</abstract><pub>Elsevier B.V</pub><doi>10.1016/0022-0248(87)90036-4</doi><tpages>7</tpages></addata></record> |
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| ispartof | Journal of crystal growth, 1987-12, Vol.85 (4), p.632-638 |
| issn | 0022-0248 1873-5002 |
| language | eng |
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| source | Elsevier ScienceDirect Journals Complete - AutoHoldings |
| title | Superconductivity in lanthanum barium cuprate perovskites |
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