Scaling behavior of point contacts between a tungsten tip and the heavy-fermion superconductors
We investigated metallic point contacts between a tungsten tip and the superconducting heavy-fermion compounds. On lowering the temperature to below T sub(c) the contact resistance drops by delta R. Usually this change in resistance is interpreted by the Andreev-reflection process at the normal-supe...
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| Veröffentlicht in: | Journal of Low Temperature Physics 1996-10, Vol.105 (1-2), p.37-65 |
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| container_title | Journal of Low Temperature Physics |
| container_volume | 105 |
| creator | GLOOS, K ANDERS, F. B STEWART, G. R BUSCHINGER, B GEIBEL, C HEUSER, K JÄHRLING, F KIM, J. S KLEMENS, R MÜLLER-REISENER, R SCHANK, C |
| description | We investigated metallic point contacts between a tungsten tip and the superconducting heavy-fermion compounds. On lowering the temperature to below T sub(c) the contact resistance drops by delta R. Usually this change in resistance is interpreted by the Andreev-reflection process at the normal-superconducting interface. However, we found that delta R does not scale with the inverse area of the orifice - as expected for Andreev reflection - but with the inverse radius and the specific resistivity in the normal state. Such a behaviour is characteristic for Maxwell's resistance being suppressed in the superconducting heavy-fermion phase. Additionally, the residual contact resistance at zero-bias is strongly enhanced compared to the ballistic Sharvin contribution. We discuss the possible microscopic origin for the reduced or even absent Andreev-hole current and the enhanced residual resistance. |
| doi_str_mv | 10.1007/bf00754627 |
| format | Article |
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B ; STEWART, G. R ; BUSCHINGER, B ; GEIBEL, C ; HEUSER, K ; JÄHRLING, F ; KIM, J. S ; KLEMENS, R ; MÜLLER-REISENER, R ; SCHANK, C</creator><creatorcontrib>GLOOS, K ; ANDERS, F. B ; STEWART, G. R ; BUSCHINGER, B ; GEIBEL, C ; HEUSER, K ; JÄHRLING, F ; KIM, J. S ; KLEMENS, R ; MÜLLER-REISENER, R ; SCHANK, C</creatorcontrib><description>We investigated metallic point contacts between a tungsten tip and the superconducting heavy-fermion compounds. On lowering the temperature to below T sub(c) the contact resistance drops by delta R. Usually this change in resistance is interpreted by the Andreev-reflection process at the normal-superconducting interface. However, we found that delta R does not scale with the inverse area of the orifice - as expected for Andreev reflection - but with the inverse radius and the specific resistivity in the normal state. Such a behaviour is characteristic for Maxwell's resistance being suppressed in the superconducting heavy-fermion phase. Additionally, the residual contact resistance at zero-bias is strongly enhanced compared to the ballistic Sharvin contribution. We discuss the possible microscopic origin for the reduced or even absent Andreev-hole current and the enhanced residual resistance.</description><identifier>ISSN: 0022-2291</identifier><identifier>EISSN: 1573-7357</identifier><identifier>DOI: 10.1007/bf00754627</identifier><identifier>CODEN: JLTPAC</identifier><language>eng</language><publisher>Heidelberg: Springer</publisher><subject>Applied sciences ; Charge carriers ; Condensed matter: electronic structure, electrical, magnetic, and optical properties ; Contact angle ; ELECTRIC CONDUCTIVITY ; Electric conductivity of solids ; ELECTRIC CONTACTS ; Electric currents ; Electric resistance ; Exact sciences and technology ; Heavy-fermion superconductors ; MATERIALS SCIENCE ; Metals. Metallurgy ; Multilayers, superlattices , heterostructures ; Physics ; SCALING LAWS ; Superconducting films and low-dimensional structures ; Superconducting materials (excluding high-tc compounds) ; Superconducting transition temperature ; Superconductivity ; SUPERCONDUCTORS ; Thermal effects ; TUNGSTEN</subject><ispartof>Journal of Low Temperature Physics, 1996-10, Vol.105 (1-2), p.37-65</ispartof><rights>1997 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c413t-299aa8d281477dcfb2b2e251a525ae3b23228a00f4dc84e3ca736d92332095663</citedby><cites>FETCH-LOGICAL-c413t-299aa8d281477dcfb2b2e251a525ae3b23228a00f4dc84e3ca736d92332095663</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,885,27923,27924</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=2490620$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.osti.gov/biblio/482488$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>GLOOS, K</creatorcontrib><creatorcontrib>ANDERS, F. 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However, we found that delta R does not scale with the inverse area of the orifice - as expected for Andreev reflection - but with the inverse radius and the specific resistivity in the normal state. Such a behaviour is characteristic for Maxwell's resistance being suppressed in the superconducting heavy-fermion phase. Additionally, the residual contact resistance at zero-bias is strongly enhanced compared to the ballistic Sharvin contribution. We discuss the possible microscopic origin for the reduced or even absent Andreev-hole current and the enhanced residual resistance.</description><subject>Applied sciences</subject><subject>Charge carriers</subject><subject>Condensed matter: electronic structure, electrical, magnetic, and optical properties</subject><subject>Contact angle</subject><subject>ELECTRIC CONDUCTIVITY</subject><subject>Electric conductivity of solids</subject><subject>ELECTRIC CONTACTS</subject><subject>Electric currents</subject><subject>Electric resistance</subject><subject>Exact sciences and technology</subject><subject>Heavy-fermion superconductors</subject><subject>MATERIALS SCIENCE</subject><subject>Metals. Metallurgy</subject><subject>Multilayers, superlattices , heterostructures</subject><subject>Physics</subject><subject>SCALING LAWS</subject><subject>Superconducting films and low-dimensional structures</subject><subject>Superconducting materials (excluding high-tc compounds)</subject><subject>Superconducting transition temperature</subject><subject>Superconductivity</subject><subject>SUPERCONDUCTORS</subject><subject>Thermal effects</subject><subject>TUNGSTEN</subject><issn>0022-2291</issn><issn>1573-7357</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1996</creationdate><recordtype>article</recordtype><recordid>eNp9kV9rFTEQxYMoeK2--AkiiIXC2mSSTTaPtvSPUPDB-hyy2dneyL3JmmRb-u1NudXHvswMzO8chjmEfOTsK2dMn45zq71UoF-RDe-16LTo9WuyYQygAzD8LXlXym_GmBmU2BD707tdiHd0xK27DynTNNMlhVipT7E6X0tb1QfESB2ta7wrtY01LNTFidYt0i26-8duxrwPKdKyLpibdFp9Tbm8J29mtyv44bkfkV-XF7fn193Nj6vv599uOi-5qB0Y49wwwcCl1pOfRxgBoeeuh96hGEEADI6xWU5-kCi800JNBoQAZnqlxBH5dPBNpQZbfKjot-2MiL5aOYAchsYcH5glpz8rlmr3oXjc7VzEtBarpeK8Z4o38suLJCgwWnLTwJMD6HMqJeNslxz2Lj9azuxTIvbs8l8iDf787OpK-_qcXfSh_FeANEwBE38BD46KFg</recordid><startdate>19961001</startdate><enddate>19961001</enddate><creator>GLOOS, K</creator><creator>ANDERS, F. 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Metallurgy</topic><topic>Multilayers, superlattices , heterostructures</topic><topic>Physics</topic><topic>SCALING LAWS</topic><topic>Superconducting films and low-dimensional structures</topic><topic>Superconducting materials (excluding high-tc compounds)</topic><topic>Superconducting transition temperature</topic><topic>Superconductivity</topic><topic>SUPERCONDUCTORS</topic><topic>Thermal effects</topic><topic>TUNGSTEN</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>GLOOS, K</creatorcontrib><creatorcontrib>ANDERS, F. B</creatorcontrib><creatorcontrib>STEWART, G. R</creatorcontrib><creatorcontrib>BUSCHINGER, B</creatorcontrib><creatorcontrib>GEIBEL, C</creatorcontrib><creatorcontrib>HEUSER, K</creatorcontrib><creatorcontrib>JÄHRLING, F</creatorcontrib><creatorcontrib>KIM, J. 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S</au><au>KLEMENS, R</au><au>MÜLLER-REISENER, R</au><au>SCHANK, C</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Scaling behavior of point contacts between a tungsten tip and the heavy-fermion superconductors</atitle><jtitle>Journal of Low Temperature Physics</jtitle><date>1996-10-01</date><risdate>1996</risdate><volume>105</volume><issue>1-2</issue><spage>37</spage><epage>65</epage><pages>37-65</pages><issn>0022-2291</issn><eissn>1573-7357</eissn><coden>JLTPAC</coden><abstract>We investigated metallic point contacts between a tungsten tip and the superconducting heavy-fermion compounds. On lowering the temperature to below T sub(c) the contact resistance drops by delta R. Usually this change in resistance is interpreted by the Andreev-reflection process at the normal-superconducting interface. However, we found that delta R does not scale with the inverse area of the orifice - as expected for Andreev reflection - but with the inverse radius and the specific resistivity in the normal state. Such a behaviour is characteristic for Maxwell's resistance being suppressed in the superconducting heavy-fermion phase. Additionally, the residual contact resistance at zero-bias is strongly enhanced compared to the ballistic Sharvin contribution. We discuss the possible microscopic origin for the reduced or even absent Andreev-hole current and the enhanced residual resistance.</abstract><cop>Heidelberg</cop><pub>Springer</pub><doi>10.1007/bf00754627</doi><tpages>29</tpages></addata></record> |
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| subjects | Applied sciences Charge carriers Condensed matter: electronic structure, electrical, magnetic, and optical properties Contact angle ELECTRIC CONDUCTIVITY Electric conductivity of solids ELECTRIC CONTACTS Electric currents Electric resistance Exact sciences and technology Heavy-fermion superconductors MATERIALS SCIENCE Metals. Metallurgy Multilayers, superlattices , heterostructures Physics SCALING LAWS Superconducting films and low-dimensional structures Superconducting materials (excluding high-tc compounds) Superconducting transition temperature Superconductivity SUPERCONDUCTORS Thermal effects TUNGSTEN |
| title | Scaling behavior of point contacts between a tungsten tip and the heavy-fermion superconductors |
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