Fermi-Surface Topological Phase Transition and Horizontal Order-Parameter Nodes in CaFe2As2 Under Pressure
Iron-based compounds (IBS) display a surprising variety of superconducting properties that seems to arise from the strong sensitivity of these systems to tiny details of the lattice structure. In this respect, systems that become superconducting under pressure, like CaFe 2 As 2 , are of particular i...
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| Veröffentlicht in: | Scientific reports 2016-05, Vol.6 (1), p.26394-26394, Article 26394 |
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| creator | Gonnelli, R. S. Daghero, D. Tortello, M. Ummarino, G. A. Bukowski, Z. Karpinski, J. Reuvekamp, P. G. Kremer, R. K. Profeta, G. Suzuki, K. Kuroki, K. |
| description | Iron-based compounds (IBS) display a surprising variety of superconducting properties that seems to arise from the strong sensitivity of these systems to tiny details of the lattice structure. In this respect, systems that become superconducting under pressure, like CaFe
2
As
2
, are of particular interest. Here we report on the first directional point-contact Andreev-reflection spectroscopy (PCARS) measurements on CaFe
2
As
2
crystals under quasi-hydrostatic pressure, and on the interpretation of the results using a 3D model for Andreev reflection combined with ab-initio calculations of the Fermi surface (within the density functional theory) and of the order parameter symmetry (within a random-phase-approximation approach in a ten-orbital model). The almost perfect agreement between PCARS results at different pressures and theoretical predictions highlights the intimate connection between the changes in the lattice structure, a topological transition in the holelike Fermi surface sheet, and the emergence on the same sheet of an order parameter with a horizontal node line. |
| doi_str_mv | 10.1038/srep26394 |
| format | Article |
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2
As
2
, are of particular interest. Here we report on the first directional point-contact Andreev-reflection spectroscopy (PCARS) measurements on CaFe
2
As
2
crystals under quasi-hydrostatic pressure, and on the interpretation of the results using a 3D model for Andreev reflection combined with ab-initio calculations of the Fermi surface (within the density functional theory) and of the order parameter symmetry (within a random-phase-approximation approach in a ten-orbital model). The almost perfect agreement between PCARS results at different pressures and theoretical predictions highlights the intimate connection between the changes in the lattice structure, a topological transition in the holelike Fermi surface sheet, and the emergence on the same sheet of an order parameter with a horizontal node line.</description><identifier>ISSN: 2045-2322</identifier><identifier>EISSN: 2045-2322</identifier><identifier>DOI: 10.1038/srep26394</identifier><identifier>PMID: 27216477</identifier><language>eng</language><publisher>London: Nature Publishing Group UK</publisher><subject>639/301/119/995 ; 639/766/119/1003 ; Crystals ; Humanities and Social Sciences ; Hydrostatic pressure ; Iron ; multidisciplinary ; Nodes ; Phase transitions ; Pressure ; Science ; Spectroscopy</subject><ispartof>Scientific reports, 2016-05, Vol.6 (1), p.26394-26394, Article 26394</ispartof><rights>The Author(s) 2016</rights><rights>Copyright Nature Publishing Group May 2016</rights><rights>Copyright © 2016, Macmillan Publishers Limited 2016 Macmillan Publishers Limited</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c438t-735a98aed2f4d2c11f636ff3e66600437e67502e57ee0a5dc52d9a32d48a255a3</citedby><cites>FETCH-LOGICAL-c438t-735a98aed2f4d2c11f636ff3e66600437e67502e57ee0a5dc52d9a32d48a255a3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC4877643/pdf/$$EPDF$$P50$$Gpubmedcentral$$Hfree_for_read</linktopdf><linktohtml>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC4877643/$$EHTML$$P50$$Gpubmedcentral$$Hfree_for_read</linktohtml><link.rule.ids>230,314,723,776,780,860,881,27901,27902,41096,42165,51551,53766,53768</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/27216477$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Gonnelli, R. S.</creatorcontrib><creatorcontrib>Daghero, D.</creatorcontrib><creatorcontrib>Tortello, M.</creatorcontrib><creatorcontrib>Ummarino, G. A.</creatorcontrib><creatorcontrib>Bukowski, Z.</creatorcontrib><creatorcontrib>Karpinski, J.</creatorcontrib><creatorcontrib>Reuvekamp, P. G.</creatorcontrib><creatorcontrib>Kremer, R. K.</creatorcontrib><creatorcontrib>Profeta, G.</creatorcontrib><creatorcontrib>Suzuki, K.</creatorcontrib><creatorcontrib>Kuroki, K.</creatorcontrib><title>Fermi-Surface Topological Phase Transition and Horizontal Order-Parameter Nodes in CaFe2As2 Under Pressure</title><title>Scientific reports</title><addtitle>Sci Rep</addtitle><addtitle>Sci Rep</addtitle><description>Iron-based compounds (IBS) display a surprising variety of superconducting properties that seems to arise from the strong sensitivity of these systems to tiny details of the lattice structure. In this respect, systems that become superconducting under pressure, like CaFe
2
As
2
, are of particular interest. Here we report on the first directional point-contact Andreev-reflection spectroscopy (PCARS) measurements on CaFe
2
As
2
crystals under quasi-hydrostatic pressure, and on the interpretation of the results using a 3D model for Andreev reflection combined with ab-initio calculations of the Fermi surface (within the density functional theory) and of the order parameter symmetry (within a random-phase-approximation approach in a ten-orbital model). The almost perfect agreement between PCARS results at different pressures and theoretical predictions highlights the intimate connection between the changes in the lattice structure, a topological transition in the holelike Fermi surface sheet, and the emergence on the same sheet of an order parameter with a horizontal node line.</description><subject>639/301/119/995</subject><subject>639/766/119/1003</subject><subject>Crystals</subject><subject>Humanities and Social Sciences</subject><subject>Hydrostatic pressure</subject><subject>Iron</subject><subject>multidisciplinary</subject><subject>Nodes</subject><subject>Phase transitions</subject><subject>Pressure</subject><subject>Science</subject><subject>Spectroscopy</subject><issn>2045-2322</issn><issn>2045-2322</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><sourceid>C6C</sourceid><sourceid>BENPR</sourceid><recordid>eNplkV1rFDEUhoMotrS98A_IgDcqTJvvzNwIZXGtUOxC2-twnJzZZplJ1mSmoL_elK3LqrlJyPvw5ISXkDeMnjMqmouccMu1aOULcsypVDUXnL88OB-Rs5w3tCzFW8na1-SIG860NOaYbJaYRl_fzqmHDqu7uI1DXPsOhmr1ALncJAjZTz6GCoKrrmLyv2KYSn6THKZ6BQlGnDBV36LDXPlQLWCJ_DLz6j4UololzHlOeEpe9TBkPHveT8j98vPd4qq-vvnydXF5XXdSNFNthIK2AXS8l453jPVa6L4XqLWmVAqD2ijKURlECsp1irsWBHeyAa4UiBPyaefdzt9HdB2GKcFgt8mPkH7aCN7-nQT_YNfx0crGGC1FEbx_FqT4Y8Y82dHnDocBAsY5W2ZaJoRkQhb03T_oJs4plO9Z1jAlRNs0T8IPO6pLMZe--v0wjNqnEu2-xMK-PZx-T_6prAAfd0AuUVhjOnjyP9tvq8qmTA</recordid><startdate>20160524</startdate><enddate>20160524</enddate><creator>Gonnelli, R. 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S.</au><au>Daghero, D.</au><au>Tortello, M.</au><au>Ummarino, G. A.</au><au>Bukowski, Z.</au><au>Karpinski, J.</au><au>Reuvekamp, P. G.</au><au>Kremer, R. K.</au><au>Profeta, G.</au><au>Suzuki, K.</au><au>Kuroki, K.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Fermi-Surface Topological Phase Transition and Horizontal Order-Parameter Nodes in CaFe2As2 Under Pressure</atitle><jtitle>Scientific reports</jtitle><stitle>Sci Rep</stitle><addtitle>Sci Rep</addtitle><date>2016-05-24</date><risdate>2016</risdate><volume>6</volume><issue>1</issue><spage>26394</spage><epage>26394</epage><pages>26394-26394</pages><artnum>26394</artnum><issn>2045-2322</issn><eissn>2045-2322</eissn><abstract>Iron-based compounds (IBS) display a surprising variety of superconducting properties that seems to arise from the strong sensitivity of these systems to tiny details of the lattice structure. In this respect, systems that become superconducting under pressure, like CaFe
2
As
2
, are of particular interest. Here we report on the first directional point-contact Andreev-reflection spectroscopy (PCARS) measurements on CaFe
2
As
2
crystals under quasi-hydrostatic pressure, and on the interpretation of the results using a 3D model for Andreev reflection combined with ab-initio calculations of the Fermi surface (within the density functional theory) and of the order parameter symmetry (within a random-phase-approximation approach in a ten-orbital model). The almost perfect agreement between PCARS results at different pressures and theoretical predictions highlights the intimate connection between the changes in the lattice structure, a topological transition in the holelike Fermi surface sheet, and the emergence on the same sheet of an order parameter with a horizontal node line.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><pmid>27216477</pmid><doi>10.1038/srep26394</doi><tpages>1</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | 639/301/119/995 639/766/119/1003 Crystals Humanities and Social Sciences Hydrostatic pressure Iron multidisciplinary Nodes Phase transitions Pressure Science Spectroscopy |
| title | Fermi-Surface Topological Phase Transition and Horizontal Order-Parameter Nodes in CaFe2As2 Under Pressure |
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