Evidence for two superconducting gaps in MgB2
We have measured the Raman spectra of polycrystalline MgB2 from 25 to 1200 cm(-1). A superconductivity-induced redistribution in the electronic Raman continuum was observed. Two pair-breaking peaks appear in the spectra, suggesting the presence of two superconducting gaps. The measured spectra were...
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| Veröffentlicht in: | Physical review letters 2001-10, Vol.87 (15), p.157002-157002 |
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| container_title | Physical review letters |
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| creator | Chen, X K Konstantinovic, M J Irwin, J C Lawrie, D D Franck, J P |
| description | We have measured the Raman spectra of polycrystalline MgB2 from 25 to 1200 cm(-1). A superconductivity-induced redistribution in the electronic Raman continuum was observed. Two pair-breaking peaks appear in the spectra, suggesting the presence of two superconducting gaps. The measured spectra were analyzed using a quasi-two-dimensional model in which two s-wave superconducting gaps open on two sheets of Fermi surface. For the gap values we have obtained Delta(1) = 22 cm(-1) ( 2.7 meV) and Delta(2) = 50 cm(-1) ( 6.2 meV). Our results suggest that a conventional phonon-mediated pairing mechanism occurs in the planar boron sigma bands and is responsible for the superconductivity of MgB2. |
| doi_str_mv | 10.1103/PhysRevLett.87.157002 |
| format | Article |
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A superconductivity-induced redistribution in the electronic Raman continuum was observed. Two pair-breaking peaks appear in the spectra, suggesting the presence of two superconducting gaps. The measured spectra were analyzed using a quasi-two-dimensional model in which two s-wave superconducting gaps open on two sheets of Fermi surface. For the gap values we have obtained Delta(1) = 22 cm(-1) ( 2.7 meV) and Delta(2) = 50 cm(-1) ( 6.2 meV). Our results suggest that a conventional phonon-mediated pairing mechanism occurs in the planar boron sigma bands and is responsible for the superconductivity of MgB2.</description><identifier>ISSN: 0031-9007</identifier><identifier>DOI: 10.1103/PhysRevLett.87.157002</identifier><identifier>PMID: 11580720</identifier><language>eng</language><publisher>United States</publisher><ispartof>Physical review letters, 2001-10, Vol.87 (15), p.157002-157002</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c246t-55605f8386f2428849e52445280060871a76e0d36bb8156e4d14f7b2337f3ac3</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/11580720$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Chen, X K</creatorcontrib><creatorcontrib>Konstantinovic, M J</creatorcontrib><creatorcontrib>Irwin, J C</creatorcontrib><creatorcontrib>Lawrie, D D</creatorcontrib><creatorcontrib>Franck, J P</creatorcontrib><title>Evidence for two superconducting gaps in MgB2</title><title>Physical review letters</title><addtitle>Phys Rev Lett</addtitle><description>We have measured the Raman spectra of polycrystalline MgB2 from 25 to 1200 cm(-1). A superconductivity-induced redistribution in the electronic Raman continuum was observed. Two pair-breaking peaks appear in the spectra, suggesting the presence of two superconducting gaps. The measured spectra were analyzed using a quasi-two-dimensional model in which two s-wave superconducting gaps open on two sheets of Fermi surface. For the gap values we have obtained Delta(1) = 22 cm(-1) ( 2.7 meV) and Delta(2) = 50 cm(-1) ( 6.2 meV). Our results suggest that a conventional phonon-mediated pairing mechanism occurs in the planar boron sigma bands and is responsible for the superconductivity of MgB2.</description><issn>0031-9007</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2001</creationdate><recordtype>article</recordtype><recordid>eNo1j8tKw0AUQGeh2Fr9BGVW7hLvnXeXWuoDIop0H5LJTYzkZSap9O8VrKuzORw4jF0hxIggb98-DuGd9glNU-xsjNoCiBO2BJAYrQHsgp2H8AkAKIw7YwtE7cAKWLJou68L6jzxsh_59N3zMA80-r4rZj_VXcWrbAi87vhLdS8u2GmZNYEuj1yx3cN2t3mKktfH581dEnmhzBRpbUCXTjpTCiWcU2vSQiktHIABZzGzhqCQJs8dakOqQFXaXEhpS5l5uWI3f9lh7L9mClPa1sFT02Qd9XNILQow6Na_4vVRnPOWinQY6zYbD-n_n_wByx5P8Q</recordid><startdate>20011008</startdate><enddate>20011008</enddate><creator>Chen, X K</creator><creator>Konstantinovic, M J</creator><creator>Irwin, J C</creator><creator>Lawrie, D D</creator><creator>Franck, J P</creator><scope>NPM</scope><scope>7X8</scope></search><sort><creationdate>20011008</creationdate><title>Evidence for two superconducting gaps in MgB2</title><author>Chen, X K ; Konstantinovic, M J ; Irwin, J C ; Lawrie, D D ; Franck, J P</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c246t-55605f8386f2428849e52445280060871a76e0d36bb8156e4d14f7b2337f3ac3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2001</creationdate><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Chen, X K</creatorcontrib><creatorcontrib>Konstantinovic, M J</creatorcontrib><creatorcontrib>Irwin, J C</creatorcontrib><creatorcontrib>Lawrie, D D</creatorcontrib><creatorcontrib>Franck, J P</creatorcontrib><collection>PubMed</collection><collection>MEDLINE - Academic</collection><jtitle>Physical review letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Chen, X K</au><au>Konstantinovic, M J</au><au>Irwin, J C</au><au>Lawrie, D D</au><au>Franck, J P</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Evidence for two superconducting gaps in MgB2</atitle><jtitle>Physical review letters</jtitle><addtitle>Phys Rev Lett</addtitle><date>2001-10-08</date><risdate>2001</risdate><volume>87</volume><issue>15</issue><spage>157002</spage><epage>157002</epage><pages>157002-157002</pages><issn>0031-9007</issn><abstract>We have measured the Raman spectra of polycrystalline MgB2 from 25 to 1200 cm(-1). A superconductivity-induced redistribution in the electronic Raman continuum was observed. Two pair-breaking peaks appear in the spectra, suggesting the presence of two superconducting gaps. The measured spectra were analyzed using a quasi-two-dimensional model in which two s-wave superconducting gaps open on two sheets of Fermi surface. For the gap values we have obtained Delta(1) = 22 cm(-1) ( 2.7 meV) and Delta(2) = 50 cm(-1) ( 6.2 meV). Our results suggest that a conventional phonon-mediated pairing mechanism occurs in the planar boron sigma bands and is responsible for the superconductivity of MgB2.</abstract><cop>United States</cop><pmid>11580720</pmid><doi>10.1103/PhysRevLett.87.157002</doi><tpages>1</tpages></addata></record> |
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| title | Evidence for two superconducting gaps in MgB2 |
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