Magnetic Field Dependence of Dielectric Constant and Resistivity of Eu sub(0.98)Ba sub(0.02)TiO sub(3)
Polycrystalline perovskite Eu sub(0.98)Ba sub(0.02)TiO sub(3), in which Eu super(2+): 4f super(7) spins order antiferromagnetically below $T_{N} = 4.6$ K, shows a large positive magnetodielectric effect (MDE) and a negative magnetoresistance (MR) in the paramagnetic state. The MDE $\sim +120$ % and...
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| Veröffentlicht in: | IEEE transactions on magnetics 2016-07, Vol.52 (7), p.1-4 |
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| creator | Rubi, Km Mahendiran, R |
| description | Polycrystalline perovskite Eu sub(0.98)Ba sub(0.02)TiO sub(3), in which Eu super(2+): 4f super(7) spins order antiferromagnetically below $T_{N} = 4.6$ K, shows a large positive magnetodielectric effect (MDE) and a negative magnetoresistance (MR) in the paramagnetic state. The MDE $\sim +120$ % and MR $\sim -91$ % for $f = 1$ kHz at $T =10$ K and under $\mu _{0}H = 7$ T. The field dependence of the MDE and the MR is distinct. While the magnitude of the MR increases rapidly for $\mu _{0}H 3$ T, the MDE shows a small value for $\mu _{0}H |
| doi_str_mv | 10.1109/TMAG.2016.2536624 |
| format | Article |
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The MDE $\sim +120$ % and MR $\sim -91$ % for $f = 1$ kHz at $T =10$ K and under $\mu _{0}H = 7$ T. The field dependence of the MDE and the MR is distinct. While the magnitude of the MR increases rapidly for $\mu _{0}H <1$ T and nearly saturates for $\mu _{0}H > 3$ T, the MDE shows a small value for $\mu _{0}H <1$ T and increases smoothly without saturation above 1 T. It is suggested that a bound magnetic polaron forms around oxygen defects in zero field for $T \le 50$ K. The negative MR is suggested due to the increase in the size of the magnetic polaron and their percolation with increasing magnetic field. On the other hand, the positive MDE arises due to spin-phonon coupling possibly driven by the hybridization of Eu-4f and O-2p orbitals.</description><identifier>ISSN: 0018-9464</identifier><identifier>EISSN: 1941-0069</identifier><identifier>DOI: 10.1109/TMAG.2016.2536624</identifier><language>eng</language><subject>Coupling ; Dielectric constant ; Electrical resistivity ; Magnetic fields ; Magnetoresistance ; Magnetoresistivity ; Percolation ; Polarons</subject><ispartof>IEEE transactions on magnetics, 2016-07, Vol.52 (7), p.1-4</ispartof><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids></links><search><creatorcontrib>Rubi, Km</creatorcontrib><creatorcontrib>Mahendiran, R</creatorcontrib><title>Magnetic Field Dependence of Dielectric Constant and Resistivity of Eu sub(0.98)Ba sub(0.02)TiO sub(3)</title><title>IEEE transactions on magnetics</title><description>Polycrystalline perovskite Eu sub(0.98)Ba sub(0.02)TiO sub(3), in which Eu super(2+): 4f super(7) spins order antiferromagnetically below $T_{N} = 4.6$ K, shows a large positive magnetodielectric effect (MDE) and a negative magnetoresistance (MR) in the paramagnetic state. The MDE $\sim +120$ % and MR $\sim -91$ % for $f = 1$ kHz at $T =10$ K and under $\mu _{0}H = 7$ T. The field dependence of the MDE and the MR is distinct. While the magnitude of the MR increases rapidly for $\mu _{0}H <1$ T and nearly saturates for $\mu _{0}H > 3$ T, the MDE shows a small value for $\mu _{0}H <1$ T and increases smoothly without saturation above 1 T. It is suggested that a bound magnetic polaron forms around oxygen defects in zero field for $T \le 50$ K. The negative MR is suggested due to the increase in the size of the magnetic polaron and their percolation with increasing magnetic field. On the other hand, the positive MDE arises due to spin-phonon coupling possibly driven by the hybridization of Eu-4f and O-2p orbitals.</description><subject>Coupling</subject><subject>Dielectric constant</subject><subject>Electrical resistivity</subject><subject>Magnetic fields</subject><subject>Magnetoresistance</subject><subject>Magnetoresistivity</subject><subject>Percolation</subject><subject>Polarons</subject><issn>0018-9464</issn><issn>1941-0069</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNqVistOwzAQRS0EEuHxAey8bBYJM45txUvoAzYVEsq-MskEGQWndBwk_p5Q9QdY3XvuPULcIZSI4O6b7cNTqQBtqUxlrdJnIkOnsQCw7lxkAFgXTlt9Ka6YP2bUBiET_da_R0qhlZtAQydXtKfYUWxJjr1czRu16TDfyzFy8jFJHzv5Shw4he-Qfv609SR5eltA6er80Z86qLwJL0eo8htx0fuB6faU12KxWTfL52J_GL8m4rT7DNzSMPhI48Q7rJUxlTO1rv6h_gKK0047</recordid><startdate>20160701</startdate><enddate>20160701</enddate><creator>Rubi, Km</creator><creator>Mahendiran, R</creator><scope>7SP</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>F28</scope><scope>FR3</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>20160701</creationdate><title>Magnetic Field Dependence of Dielectric Constant and Resistivity of Eu sub(0.98)Ba sub(0.02)TiO sub(3)</title><author>Rubi, Km ; Mahendiran, R</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-proquest_miscellaneous_18255395843</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>Coupling</topic><topic>Dielectric constant</topic><topic>Electrical resistivity</topic><topic>Magnetic fields</topic><topic>Magnetoresistance</topic><topic>Magnetoresistivity</topic><topic>Percolation</topic><topic>Polarons</topic><toplevel>online_resources</toplevel><creatorcontrib>Rubi, Km</creatorcontrib><creatorcontrib>Mahendiran, R</creatorcontrib><collection>Electronics & Communications Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>IEEE transactions on magnetics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Rubi, Km</au><au>Mahendiran, R</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Magnetic Field Dependence of Dielectric Constant and Resistivity of Eu sub(0.98)Ba sub(0.02)TiO sub(3)</atitle><jtitle>IEEE transactions on magnetics</jtitle><date>2016-07-01</date><risdate>2016</risdate><volume>52</volume><issue>7</issue><spage>1</spage><epage>4</epage><pages>1-4</pages><issn>0018-9464</issn><eissn>1941-0069</eissn><abstract>Polycrystalline perovskite Eu sub(0.98)Ba sub(0.02)TiO sub(3), in which Eu super(2+): 4f super(7) spins order antiferromagnetically below $T_{N} = 4.6$ K, shows a large positive magnetodielectric effect (MDE) and a negative magnetoresistance (MR) in the paramagnetic state. The MDE $\sim +120$ % and MR $\sim -91$ % for $f = 1$ kHz at $T =10$ K and under $\mu _{0}H = 7$ T. The field dependence of the MDE and the MR is distinct. While the magnitude of the MR increases rapidly for $\mu _{0}H <1$ T and nearly saturates for $\mu _{0}H > 3$ T, the MDE shows a small value for $\mu _{0}H <1$ T and increases smoothly without saturation above 1 T. It is suggested that a bound magnetic polaron forms around oxygen defects in zero field for $T \le 50$ K. The negative MR is suggested due to the increase in the size of the magnetic polaron and their percolation with increasing magnetic field. On the other hand, the positive MDE arises due to spin-phonon coupling possibly driven by the hybridization of Eu-4f and O-2p orbitals.</abstract><doi>10.1109/TMAG.2016.2536624</doi></addata></record> |
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| subjects | Coupling Dielectric constant Electrical resistivity Magnetic fields Magnetoresistance Magnetoresistivity Percolation Polarons |
| title | Magnetic Field Dependence of Dielectric Constant and Resistivity of Eu sub(0.98)Ba sub(0.02)TiO sub(3) |
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