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Tunneling Density of States of Indium Oxide Films Through the Superconductor to Insulator Transition

Identifieur interne : 000276 ( Main/Repository ); précédent : 000275; suivant : 000277

Tunneling Density of States of Indium Oxide Films Through the Superconductor to Insulator Transition

Auteurs : RBID : Pascal:13-0210689

Descripteurs français

Pascal (Inist)
- Effet tunnel, Transition métal isolant, Spectrométrie tunnel, Bande interdite supraconductrice, Bande interdite, Structure granulaire, Oxyde d'indium, Jonction tunnel, Théorie BCS, Supraconductivité, Densité porteur charge, Supraconducteur, CaSe.

English descriptors

KwdEn :
- BCS theory, Carrier density, Energy gap, Granular structure, Indium oxide, Metal-insulator transition, Superconducting energy gap, Superconductivity, Superconductors, Tunnel effect, Tunnel junction, Tunneling spectroscopy.

Abstract

We present planar tunneling junction spectroscopy measurements on disordered amorphous indium oxide films on both sides of the superconductor-insulator transition. Our measurements directly reveal a superconducting gap in the insulating phase. The measured energy gap has the same energy scale on both sides of the transition. Unlike the case of granular films, the tunneling curves cannot be fitted to the BCS density of state expression, even when introducing a broadening parameter to account for nonthermal broadening sources. The results are consistent with the presence of superconducting islands of which superconducting properties depend on film disorder and on the carrier density of the superconducting material.

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Le document en format XML

<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">Tunneling Density of States of Indium Oxide Films Through the Superconductor to Insulator Transition</title>
<author><name sortKey="Sherman, D" uniqKey="Sherman D">D. Sherman</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>The Department of Physics, Bar Ilan University</s1>
<s2>Ramat Gan 52900</s2>
<s3>ISR</s3>
<sZ>1 aut.</sZ>
<sZ>5 aut.</sZ>
</inist:fA14>
<country>Israël</country>
<wicri:noRegion>Ramat Gan 52900</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Kopnov, G" uniqKey="Kopnov G">G. Kopnov</name>
<affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Department of Condensed Matter Physics, Weizmann Institute of Science</s1>
<s2>Rehovot 76100</s2>
<s3>ISR</s3>
<sZ>2 aut.</sZ>
<sZ>4 aut.</sZ>
</inist:fA14>
<country>Israël</country>
<wicri:noRegion>Rehovot 76100</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Farber, E" uniqKey="Farber E">E. Farber</name>
<affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Laboratory for Superconductivity and Optical Spectroscopy, Ariel University Center of Samaria</s1>
<s2>Ariel 40700</s2>
<s3>ISR</s3>
<sZ>3 aut.</sZ>
<sZ>4 aut.</sZ>
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<country>Israël</country>
<wicri:noRegion>Ariel 40700</wicri:noRegion>
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</author>
<author><name sortKey="Shahar, D" uniqKey="Shahar D">D. Shahar</name>
<affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Department of Condensed Matter Physics, Weizmann Institute of Science</s1>
<s2>Rehovot 76100</s2>
<s3>ISR</s3>
<sZ>2 aut.</sZ>
<sZ>4 aut.</sZ>
</inist:fA14>
<country>Israël</country>
<wicri:noRegion>Rehovot 76100</wicri:noRegion>
</affiliation>
<affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Laboratory for Superconductivity and Optical Spectroscopy, Ariel University Center of Samaria</s1>
<s2>Ariel 40700</s2>
<s3>ISR</s3>
<sZ>3 aut.</sZ>
<sZ>4 aut.</sZ>
</inist:fA14>
<country>Israël</country>
<wicri:noRegion>Ariel 40700</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Frydman, A" uniqKey="Frydman A">A. Frydman</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>The Department of Physics, Bar Ilan University</s1>
<s2>Ramat Gan 52900</s2>
<s3>ISR</s3>
<sZ>1 aut.</sZ>
<sZ>5 aut.</sZ>
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<country>Israël</country>
<wicri:noRegion>Ramat Gan 52900</wicri:noRegion>
</affiliation>
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<publicationStmt><idno type="inist">13-0210689</idno>
<date when="2013">2013</date>
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<seriesStmt><idno type="ISSN">1557-1939</idno>
<title level="j" type="abbreviated">J. supercond. nov. magn.</title>
<title level="j" type="main">Journal of superconductivity and novel magnetism</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>BCS theory</term>
<term>Carrier density</term>
<term>Energy gap</term>
<term>Granular structure</term>
<term>Indium oxide</term>
<term>Metal-insulator transition</term>
<term>Superconducting energy gap</term>
<term>Superconductivity</term>
<term>Superconductors</term>
<term>Tunnel effect</term>
<term>Tunnel junction</term>
<term>Tunneling spectroscopy</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Effet tunnel</term>
<term>Transition métal isolant</term>
<term>Spectrométrie tunnel</term>
<term>Bande interdite supraconductrice</term>
<term>Bande interdite</term>
<term>Structure granulaire</term>
<term>Oxyde d'indium</term>
<term>Jonction tunnel</term>
<term>Théorie BCS</term>
<term>Supraconductivité</term>
<term>Densité porteur charge</term>
<term>Supraconducteur</term>
<term>CaSe</term>
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<front><div type="abstract" xml:lang="en">We present planar tunneling junction spectroscopy measurements on disordered amorphous indium oxide films on both sides of the superconductor-insulator transition. Our measurements directly reveal a superconducting gap in the insulating phase. The measured energy gap has the same energy scale on both sides of the transition. Unlike the case of granular films, the tunneling curves cannot be fitted to the BCS density of state expression, even when introducing a broadening parameter to account for nonthermal broadening sources. The results are consistent with the presence of superconducting islands of which superconducting properties depend on film disorder and on the carrier density of the superconducting material.</div>
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<fA11 i1="01" i2="1"><s1>SHERMAN (D.)</s1>
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<fA11 i1="02" i2="1"><s1>KOPNOV (G.)</s1>
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<fA11 i1="04" i2="1"><s1>SHAHAR (D.)</s1>
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<fA14 i1="01"><s1>The Department of Physics, Bar Ilan University</s1>
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<sZ>5 aut.</sZ>
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<fA14 i1="02"><s1>Department of Condensed Matter Physics, Weizmann Institute of Science</s1>
<s2>Rehovot 76100</s2>
<s3>ISR</s3>
<sZ>2 aut.</sZ>
<sZ>4 aut.</sZ>
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<fA14 i1="03"><s1>Laboratory for Superconductivity and Optical Spectroscopy, Ariel University Center of Samaria</s1>
<s2>Ariel 40700</s2>
<s3>ISR</s3>
<sZ>3 aut.</sZ>
<sZ>4 aut.</sZ>
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<fC01 i1="01" l="ENG"><s0>We present planar tunneling junction spectroscopy measurements on disordered amorphous indium oxide films on both sides of the superconductor-insulator transition. Our measurements directly reveal a superconducting gap in the insulating phase. The measured energy gap has the same energy scale on both sides of the transition. Unlike the case of granular films, the tunneling curves cannot be fitted to the BCS density of state expression, even when introducing a broadening parameter to account for nonthermal broadening sources. The results are consistent with the presence of superconducting islands of which superconducting properties depend on film disorder and on the carrier density of the superconducting material.</s0>
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<s5>46</s5>
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<s5>61</s5>
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<s5>65</s5>
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<s5>65</s5>
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<fC03 i1="12" i2="3" l="FRE"><s0>Supraconducteur</s0>
<s5>66</s5>
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<fC03 i1="12" i2="3" l="ENG"><s0>Superconductors</s0>
<s5>66</s5>
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<fC03 i1="13" i2="3" l="FRE"><s0>CaSe</s0>
<s4>INC</s4>
<s5>83</s5>
</fC03>
<fN21><s1>196</s1>
</fN21>
<fN44 i1="01"><s1>OTO</s1>
</fN44>
<fN82><s1>OTO</s1>
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Tunneling Density of States of Indium Oxide Films Through the Superconductor to Insulator Transition

Tunneling Density of States of Indium Oxide Films Through the Superconductor to Insulator Transition

Descripteurs français

English descriptors

Abstract

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Links to Exploration step

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