Electrical conductivity around the topological percolation limit in Co–Ag multilayered granular alloys
We calculate the conduction channel contribution to the electrical conductivity of multilayered granular alloys composed of discontinuous Co layers embedded in Ag, alternating with Ag spacers. The electronic transport when the Co clusters percolate is also studied. We focus our attention on the two...
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| Veröffentlicht in: | Physica. B, Condensed matter Condensed matter, 2004-12, Vol.354 (1), p.198-202 |
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| creator | Milano, Julián Llois, Ana María Steren, Laura B. |
| description | We calculate the conduction channel contribution to the electrical conductivity of multilayered granular alloys composed of discontinuous Co layers embedded in Ag, alternating with Ag spacers. The electronic transport when the Co clusters percolate is also studied. We focus our attention on the two possible geometries of the conductivity: CIP (current parallel to the Co layers) and CPP (current perpendicular to the layers), and their dependence on cluster size. The electronic structure is self-consistently calculated using a tight binding Hamiltonian, which includes a Hubbard term within the unrestricted Hartree–Fock approximation. On the other hand, the conductivity tensor is obtained by using the semiclassical Boltzmann equation in the relaxation time approximation. We show that the conductivity decreases with increasing cluster size, till percolation is reached, as it is experimentally observed. |
| doi_str_mv | 10.1016/j.physb.2004.09.048 |
| format | Article |
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The electronic transport when the Co clusters percolate is also studied. We focus our attention on the two possible geometries of the conductivity: CIP (current parallel to the Co layers) and CPP (current perpendicular to the layers), and their dependence on cluster size. The electronic structure is self-consistently calculated using a tight binding Hamiltonian, which includes a Hubbard term within the unrestricted Hartree–Fock approximation. On the other hand, the conductivity tensor is obtained by using the semiclassical Boltzmann equation in the relaxation time approximation. 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B, Condensed matter</title><description>We calculate the conduction channel contribution to the electrical conductivity of multilayered granular alloys composed of discontinuous Co layers embedded in Ag, alternating with Ag spacers. The electronic transport when the Co clusters percolate is also studied. We focus our attention on the two possible geometries of the conductivity: CIP (current parallel to the Co layers) and CPP (current perpendicular to the layers), and their dependence on cluster size. The electronic structure is self-consistently calculated using a tight binding Hamiltonian, which includes a Hubbard term within the unrestricted Hartree–Fock approximation. On the other hand, the conductivity tensor is obtained by using the semiclassical Boltzmann equation in the relaxation time approximation. We show that the conductivity decreases with increasing cluster size, till percolation is reached, as it is experimentally observed.</description><subject>Band structure calculations</subject><subject>Condensed matter: electronic structure, electrical, magnetic, and optical properties</subject><subject>Electrical and thermal conduction in crystalline metals and alloys</subject><subject>Electron density of states and band structure of crystalline solids</subject><subject>Electron states</subject><subject>Electronic conduction in metals and alloys</subject><subject>Electronic transport in condensed matter</subject><subject>Exact sciences and technology</subject><subject>Granular alloys</subject><subject>Magnetic multilayers</subject><subject>Physics</subject><subject>Transition metals and alloys</subject><issn>0921-4526</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2004</creationdate><recordtype>article</recordtype><recordid>eNp9kL9u2zAQhzWkQFInT5CFS7pZ5R-LEocOhuGmAQJkaWfiQp5sGrSokJQBbX2HvmGfpEwcIFtvueX7_Q73VdUtozWjTH491ON-Ts81p3RVU1XTVXdRXVHF2XLVcHlZfU7pQMuwll1V-61Hk6Mz4IkJg51MdieXZwIxTIMleY8khzH4sHtjRowmeMguDMS7o8vEDWQT_v7-s96R4-Sz8zBjREt2EYbJQyTgfZjTdfWpB5_w5n0vql_ftz83P5aPT_cPm_Xj0gi2ykukvVAgRddCK1qBEo1VCNBw2lhg5plxa1XHUHHRg-mVVFY2QLseeE_RiEX15dw7xvAyYcr66JJB72HAMCXNFZe8VW0BxRk0MaQUsddjdEeIs2ZUv5rUB_1mUr-a1FTpYrKk7t7rIRUffXnSuPQRlaJpOskL9-3MYfn15DDqZBwOBq2LRbi2wf33zj-BXpEF</recordid><startdate>20041231</startdate><enddate>20041231</enddate><creator>Milano, Julián</creator><creator>Llois, Ana María</creator><creator>Steren, Laura B.</creator><general>Elsevier B.V</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QQ</scope><scope>7SR</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>20041231</creationdate><title>Electrical conductivity around the topological percolation limit in Co–Ag multilayered granular alloys</title><author>Milano, Julián ; Llois, Ana María ; Steren, Laura B.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c314t-e0f39a6387a7373e6ecd9eaa5205da1cb12dd981e923facf969d65a08fa2f0ec3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2004</creationdate><topic>Band structure calculations</topic><topic>Condensed matter: electronic structure, electrical, magnetic, and optical properties</topic><topic>Electrical and thermal conduction in crystalline metals and alloys</topic><topic>Electron density of states and band structure of crystalline solids</topic><topic>Electron states</topic><topic>Electronic conduction in metals and alloys</topic><topic>Electronic transport in condensed matter</topic><topic>Exact sciences and technology</topic><topic>Granular alloys</topic><topic>Magnetic multilayers</topic><topic>Physics</topic><topic>Transition metals and alloys</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Milano, Julián</creatorcontrib><creatorcontrib>Llois, Ana María</creatorcontrib><creatorcontrib>Steren, Laura B.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Ceramic Abstracts</collection><collection>Engineered Materials Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Physica. B, Condensed matter</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Milano, Julián</au><au>Llois, Ana María</au><au>Steren, Laura B.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Electrical conductivity around the topological percolation limit in Co–Ag multilayered granular alloys</atitle><jtitle>Physica. B, Condensed matter</jtitle><date>2004-12-31</date><risdate>2004</risdate><volume>354</volume><issue>1</issue><spage>198</spage><epage>202</epage><pages>198-202</pages><issn>0921-4526</issn><abstract>We calculate the conduction channel contribution to the electrical conductivity of multilayered granular alloys composed of discontinuous Co layers embedded in Ag, alternating with Ag spacers. The electronic transport when the Co clusters percolate is also studied. We focus our attention on the two possible geometries of the conductivity: CIP (current parallel to the Co layers) and CPP (current perpendicular to the layers), and their dependence on cluster size. The electronic structure is self-consistently calculated using a tight binding Hamiltonian, which includes a Hubbard term within the unrestricted Hartree–Fock approximation. On the other hand, the conductivity tensor is obtained by using the semiclassical Boltzmann equation in the relaxation time approximation. We show that the conductivity decreases with increasing cluster size, till percolation is reached, as it is experimentally observed.</abstract><cop>Amsterdam</cop><pub>Elsevier B.V</pub><doi>10.1016/j.physb.2004.09.048</doi><tpages>5</tpages></addata></record> |
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| subjects | Band structure calculations Condensed matter: electronic structure, electrical, magnetic, and optical properties Electrical and thermal conduction in crystalline metals and alloys Electron density of states and band structure of crystalline solids Electron states Electronic conduction in metals and alloys Electronic transport in condensed matter Exact sciences and technology Granular alloys Magnetic multilayers Physics Transition metals and alloys |
| title | Electrical conductivity around the topological percolation limit in Co–Ag multilayered granular alloys |
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