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Enhanced low field magnetoresistance in La0.7Sr0.3MnO3–La2O3 composites
► Polycrystalline composites between La0.7Sr0.3MnO3 (LSMO) and La2O3 phases. ► The maximum LFMR value of 2.22% at 300K in 500Oe from the composite sample with 10mol% La2O3 addition. ► Low resistivity level (
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| Published in: | Journal of alloys and compounds 2012-04, Vol.521, p.30-34 |
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| container_title | Journal of alloys and compounds |
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| creator | Kim, Hyo-Jin Yoo, Sang-Im |
| description | ► Polycrystalline composites between La0.7Sr0.3MnO3 (LSMO) and La2O3 phases. ► The maximum LFMR value of 2.22% at 300K in 500Oe from the composite sample with 10mol% La2O3 addition. ► Low resistivity level ( |
| doi_str_mv | 10.1016/j.jallcom.2011.12.121 |
| format | article |
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A significant enhancement of low-field magnetoresistance (LFMR) was obtainable from the polycrystalline composites between La0.7Sr0.3MnO3 (LSMO) and La2O3 phases. For this study, the magnetic and magnetotransport properties of samples with various compositions of (1−x)LSMO–xLa2O3 (x=0, 0.025, 0.05, 0.075, 0.1, 0.2, 0.3) were systematically investigated. Compared with pure LSMO (TC=362K), all composites exhibited a slightly depressed TC values of 355–358K, implying that the magnetic ordering of LSMO is insignificantly affected by chemically compatible La2O3. While the LFMR value at 300K in 500Oe was monotonously increased from 1.36 to 1.67% with increasing x from 0 to 0.075, it was abruptly increased to the maximum value of 2.22% for x=0.1 with only one order increase in its resistivity relative to x=0.075, and further increasing x from 0.1 to 0.3 resulted in a linear decrease to 1.8% with almost no variation in resistivity. This peculiar behavior, different from normal metallic percolation threshold effect, is closely related to the microstructure variation. Remarkably improved LFMR properties of the LSMO–La2O3 composite samples are attributed to high grain boundary areal density and sharpening of a disordered LSMO grain boundary region acting as more effective spin-dependent scattering centers.</description><identifier>ISSN: 0925-8388</identifier><identifier>EISSN: 1873-4669</identifier><identifier>DOI: 10.1016/j.jallcom.2011.12.121</identifier><language>eng</language><publisher>Kidlington: Elsevier B.V</publisher><subject>Alloys ; Condensed matter: electronic structure, electrical, magnetic, and optical properties ; Density ; Electrical resistivity ; Exact sciences and technology ; Grain boundaries ; La0.7Sr0.3MnO3 (LSMO)–La2O3 composite ; Low-field magnetoresistance (LFMR) ; Magnetic properties and materials ; Magnetoresistance ; Magnetoresistivity ; Magnetotransport phenomena, materials for magnetotransport ; Manganites ; Percolation ; Phases ; Physics ; Spin-dependent scattering</subject><ispartof>Journal of alloys and compounds, 2012-04, Vol.521, p.30-34</ispartof><rights>2011 Elsevier B.V.</rights><rights>2015 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c302t-80bf19ae79273488a03c05f4c7a557b21fd8e241fc928191e8843adfc0dcfe8d3</citedby><cites>FETCH-LOGICAL-c302t-80bf19ae79273488a03c05f4c7a557b21fd8e241fc928191e8843adfc0dcfe8d3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=25610960$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Kim, Hyo-Jin</creatorcontrib><creatorcontrib>Yoo, Sang-Im</creatorcontrib><title>Enhanced low field magnetoresistance in La0.7Sr0.3MnO3–La2O3 composites</title><title>Journal of alloys and compounds</title><description>► Polycrystalline composites between La0.7Sr0.3MnO3 (LSMO) and La2O3 phases. ► The maximum LFMR value of 2.22% at 300K in 500Oe from the composite sample with 10mol% La2O3 addition. ► Low resistivity level (<1Ωcm) far below the metallic percolation threshold. ► Closely related with a characteristic microstructure variation of composite samples. ► High grain boundary areal density and sharpening of a disordered LSMO grain boundary region acting as more effective spin-dependent scattering centers.
A significant enhancement of low-field magnetoresistance (LFMR) was obtainable from the polycrystalline composites between La0.7Sr0.3MnO3 (LSMO) and La2O3 phases. For this study, the magnetic and magnetotransport properties of samples with various compositions of (1−x)LSMO–xLa2O3 (x=0, 0.025, 0.05, 0.075, 0.1, 0.2, 0.3) were systematically investigated. Compared with pure LSMO (TC=362K), all composites exhibited a slightly depressed TC values of 355–358K, implying that the magnetic ordering of LSMO is insignificantly affected by chemically compatible La2O3. While the LFMR value at 300K in 500Oe was monotonously increased from 1.36 to 1.67% with increasing x from 0 to 0.075, it was abruptly increased to the maximum value of 2.22% for x=0.1 with only one order increase in its resistivity relative to x=0.075, and further increasing x from 0.1 to 0.3 resulted in a linear decrease to 1.8% with almost no variation in resistivity. This peculiar behavior, different from normal metallic percolation threshold effect, is closely related to the microstructure variation. Remarkably improved LFMR properties of the LSMO–La2O3 composite samples are attributed to high grain boundary areal density and sharpening of a disordered LSMO grain boundary region acting as more effective spin-dependent scattering centers.</description><subject>Alloys</subject><subject>Condensed matter: electronic structure, electrical, magnetic, and optical properties</subject><subject>Density</subject><subject>Electrical resistivity</subject><subject>Exact sciences and technology</subject><subject>Grain boundaries</subject><subject>La0.7Sr0.3MnO3 (LSMO)–La2O3 composite</subject><subject>Low-field magnetoresistance (LFMR)</subject><subject>Magnetic properties and materials</subject><subject>Magnetoresistance</subject><subject>Magnetoresistivity</subject><subject>Magnetotransport phenomena, materials for magnetotransport</subject><subject>Manganites</subject><subject>Percolation</subject><subject>Phases</subject><subject>Physics</subject><subject>Spin-dependent scattering</subject><issn>0925-8388</issn><issn>1873-4669</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNqFkM9Kw0AQxhdRsFYfQchF8JI4s5s_m5NIqVqo9KCel-1mVrekSd1NFW--g2_ok5jQ4lX4YA7zffMxP8bOERIEzK9WyUrXtWnXCQfEBHkvPGAjlIWI0zwvD9kISp7FUkh5zE5CWAEAlgJHbDZtXnVjqIrq9iOyjuoqWuuXhrrWU3ChG5aRa6K5hqR49JCIh2Yhfr6-55ovRNS3btrgOgqn7MjqOtDZfo7Z8-30aXIfzxd3s8nNPDYCeBdLWFosNRUlL0QqpQZhILOpKXSWFUuOtpLEU7Sm5BJLJClToStroDKWZCXG7HJ3d-Pbty2FTq1dMFTXuqF2GxTmBaaQiUz01mxnNb4NwZNVG-_W2n8qBDWgUyu1R6cGdAp5L-xzF_sKHYyure8huPAX5lmOUObQ-653Pur_fXfkVTCOBprOk-lU1bp_mn4Be_OGRg</recordid><startdate>20120425</startdate><enddate>20120425</enddate><creator>Kim, Hyo-Jin</creator><creator>Yoo, Sang-Im</creator><general>Elsevier B.V</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>20120425</creationdate><title>Enhanced low field magnetoresistance in La0.7Sr0.3MnO3–La2O3 composites</title><author>Kim, Hyo-Jin ; Yoo, Sang-Im</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c302t-80bf19ae79273488a03c05f4c7a557b21fd8e241fc928191e8843adfc0dcfe8d3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>Alloys</topic><topic>Condensed matter: electronic structure, electrical, magnetic, and optical properties</topic><topic>Density</topic><topic>Electrical resistivity</topic><topic>Exact sciences and technology</topic><topic>Grain boundaries</topic><topic>La0.7Sr0.3MnO3 (LSMO)–La2O3 composite</topic><topic>Low-field magnetoresistance (LFMR)</topic><topic>Magnetic properties and materials</topic><topic>Magnetoresistance</topic><topic>Magnetoresistivity</topic><topic>Magnetotransport phenomena, materials for magnetotransport</topic><topic>Manganites</topic><topic>Percolation</topic><topic>Phases</topic><topic>Physics</topic><topic>Spin-dependent scattering</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Kim, Hyo-Jin</creatorcontrib><creatorcontrib>Yoo, Sang-Im</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Journal of alloys and compounds</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Kim, Hyo-Jin</au><au>Yoo, Sang-Im</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Enhanced low field magnetoresistance in La0.7Sr0.3MnO3–La2O3 composites</atitle><jtitle>Journal of alloys and compounds</jtitle><date>2012-04-25</date><risdate>2012</risdate><volume>521</volume><spage>30</spage><epage>34</epage><pages>30-34</pages><issn>0925-8388</issn><eissn>1873-4669</eissn><abstract>► Polycrystalline composites between La0.7Sr0.3MnO3 (LSMO) and La2O3 phases. ► The maximum LFMR value of 2.22% at 300K in 500Oe from the composite sample with 10mol% La2O3 addition. ► Low resistivity level (<1Ωcm) far below the metallic percolation threshold. ► Closely related with a characteristic microstructure variation of composite samples. ► High grain boundary areal density and sharpening of a disordered LSMO grain boundary region acting as more effective spin-dependent scattering centers.
A significant enhancement of low-field magnetoresistance (LFMR) was obtainable from the polycrystalline composites between La0.7Sr0.3MnO3 (LSMO) and La2O3 phases. For this study, the magnetic and magnetotransport properties of samples with various compositions of (1−x)LSMO–xLa2O3 (x=0, 0.025, 0.05, 0.075, 0.1, 0.2, 0.3) were systematically investigated. Compared with pure LSMO (TC=362K), all composites exhibited a slightly depressed TC values of 355–358K, implying that the magnetic ordering of LSMO is insignificantly affected by chemically compatible La2O3. While the LFMR value at 300K in 500Oe was monotonously increased from 1.36 to 1.67% with increasing x from 0 to 0.075, it was abruptly increased to the maximum value of 2.22% for x=0.1 with only one order increase in its resistivity relative to x=0.075, and further increasing x from 0.1 to 0.3 resulted in a linear decrease to 1.8% with almost no variation in resistivity. This peculiar behavior, different from normal metallic percolation threshold effect, is closely related to the microstructure variation. Remarkably improved LFMR properties of the LSMO–La2O3 composite samples are attributed to high grain boundary areal density and sharpening of a disordered LSMO grain boundary region acting as more effective spin-dependent scattering centers.</abstract><cop>Kidlington</cop><pub>Elsevier B.V</pub><doi>10.1016/j.jallcom.2011.12.121</doi><tpages>5</tpages></addata></record> |
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| subjects | Alloys Condensed matter: electronic structure, electrical, magnetic, and optical properties Density Electrical resistivity Exact sciences and technology Grain boundaries La0.7Sr0.3MnO3 (LSMO)–La2O3 composite Low-field magnetoresistance (LFMR) Magnetic properties and materials Magnetoresistance Magnetoresistivity Magnetotransport phenomena, materials for magnetotransport Manganites Percolation Phases Physics Spin-dependent scattering |
| title | Enhanced low field magnetoresistance in La0.7Sr0.3MnO3–La2O3 composites |
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