Upper critical field of KFe2As2 under pressure: A test for the change in the superconducting gap structure
We report measurements of electrical resistivity under pressure to 5.8 GPa, magnetization to 6.7 GPa,and ac susceptibility to 7.1 GPa in KFe2As2. The previously reported change of slope in the pressure dependence of the superconducting transition temperature Tc(p) at a pressure p0=1.8 GPa is confirm...
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| creator | Taufour, Valentin oozani, Neda Lim, Jinhyuk Tanatar, Makariy A Kaluarachchi, Udhara Kim, Stella K Liu, Yong Lograsso, Thomas A Kogan, Vladimir G Prozorov, Ruslan Budko, Sergey L Schilling, James S Canfield, Paul C |
| description | We report measurements of electrical resistivity under pressure to 5.8 GPa, magnetization to 6.7 GPa,and ac susceptibility to 7.1 GPa in KFe2As2. The previously reported change of slope in the pressure dependence of the superconducting transition temperature Tc(p) at a pressure p0=1.8 GPa is confirmed, and Tc(p) is found to be nearly constant above p0 up to 7.1 GPa. The T-p phase diagram is very sensitive to the pressure conditions as a consequence of the anisotropic uniaxial pressure dependence of Tc. Across p0, a change in the behavior of the upper critical field is revealed through a scaling analysis of the slope of Hc2 with the effective mass as determined from the A coefficient of the T2 term of the temperature-dependent resistivity. We show that this scaling provides a quantitative test for the changes of the superconducting gap structure and suggests the development of a kz modulation of the superconducting gap above p0 as a most likely explanation. |
| doi_str_mv | 10.48550/arxiv.1402.7054 |
| format | Article |
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The previously reported change of slope in the pressure dependence of the superconducting transition temperature Tc(p) at a pressure p0=1.8 GPa is confirmed, and Tc(p) is found to be nearly constant above p0 up to 7.1 GPa. The T-p phase diagram is very sensitive to the pressure conditions as a consequence of the anisotropic uniaxial pressure dependence of Tc. Across p0, a change in the behavior of the upper critical field is revealed through a scaling analysis of the slope of Hc2 with the effective mass as determined from the A coefficient of the T2 term of the temperature-dependent resistivity. We show that this scaling provides a quantitative test for the changes of the superconducting gap structure and suggests the development of a kz modulation of the superconducting gap above p0 as a most likely explanation.</description><identifier>EISSN: 2331-8422</identifier><identifier>DOI: 10.48550/arxiv.1402.7054</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Critical field (superconductivity) ; Electrical resistivity ; Phase diagrams ; Physics - Superconductivity ; Pressure dependence ; Scaling ; Superconductivity ; Temperature dependence ; Transition temperature</subject><ispartof>arXiv.org, 2014-11</ispartof><rights>2014. This work is published under http://arxiv.org/licenses/nonexclusive-distrib/1.0/ (the “License”). 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The previously reported change of slope in the pressure dependence of the superconducting transition temperature Tc(p) at a pressure p0=1.8 GPa is confirmed, and Tc(p) is found to be nearly constant above p0 up to 7.1 GPa. The T-p phase diagram is very sensitive to the pressure conditions as a consequence of the anisotropic uniaxial pressure dependence of Tc. Across p0, a change in the behavior of the upper critical field is revealed through a scaling analysis of the slope of Hc2 with the effective mass as determined from the A coefficient of the T2 term of the temperature-dependent resistivity. We show that this scaling provides a quantitative test for the changes of the superconducting gap structure and suggests the development of a kz modulation of the superconducting gap above p0 as a most likely explanation.</description><subject>Critical field (superconductivity)</subject><subject>Electrical resistivity</subject><subject>Phase diagrams</subject><subject>Physics - Superconductivity</subject><subject>Pressure dependence</subject><subject>Scaling</subject><subject>Superconductivity</subject><subject>Temperature dependence</subject><subject>Transition temperature</subject><issn>2331-8422</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><sourceid>GOX</sourceid><recordid>eNotkEFLAzEQhYMgWGrvnmTA89bsJGmy3kqxVix4qeclm2S3KXV3TXZF_71p62l4zJvHvI-Qu5zOuRKCPurw47_nOac4l1TwKzJBxvJMccQbMovxQCnFhUQh2IQcPvreBTDBD97oI9TeHS10NbytHS4jwtjatO-Di3EM7gmWMLg4QN0FGPYOzF63jQPfnlUcU5jpWjuawbcNNLqHOISk0u0tua71MbrZ_5yS3fp5t9pk2_eX19Vym2mRq6wqcmmsVCgoR6fRCWWVXFhtjGBUS10ZTm3ORGErylhRq6JghTGuNqlTpdiU3F9izxzKPvhPHX7LE4_yxCMZHi6GPnRfYypTHroxtOmlEqnikiPjiv0BP_1jOw</recordid><startdate>20141113</startdate><enddate>20141113</enddate><creator>Taufour, Valentin</creator><creator>oozani, Neda</creator><creator>Lim, Jinhyuk</creator><creator>Tanatar, Makariy A</creator><creator>Kaluarachchi, Udhara</creator><creator>Kim, Stella K</creator><creator>Liu, Yong</creator><creator>Lograsso, Thomas A</creator><creator>Kogan, Vladimir G</creator><creator>Prozorov, Ruslan</creator><creator>Budko, Sergey L</creator><creator>Schilling, James S</creator><creator>Canfield, Paul C</creator><general>Cornell University Library, arXiv.org</general><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>L6V</scope><scope>M7S</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope><scope>GOX</scope></search><sort><creationdate>20141113</creationdate><title>Upper critical field of KFe2As2 under pressure: A test for the change in the superconducting gap structure</title><author>Taufour, Valentin ; 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The previously reported change of slope in the pressure dependence of the superconducting transition temperature Tc(p) at a pressure p0=1.8 GPa is confirmed, and Tc(p) is found to be nearly constant above p0 up to 7.1 GPa. The T-p phase diagram is very sensitive to the pressure conditions as a consequence of the anisotropic uniaxial pressure dependence of Tc. Across p0, a change in the behavior of the upper critical field is revealed through a scaling analysis of the slope of Hc2 with the effective mass as determined from the A coefficient of the T2 term of the temperature-dependent resistivity. We show that this scaling provides a quantitative test for the changes of the superconducting gap structure and suggests the development of a kz modulation of the superconducting gap above p0 as a most likely explanation.</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><doi>10.48550/arxiv.1402.7054</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Critical field (superconductivity) Electrical resistivity Phase diagrams Physics - Superconductivity Pressure dependence Scaling Superconductivity Temperature dependence Transition temperature |
| title | Upper critical field of KFe2As2 under pressure: A test for the change in the superconducting gap structure |
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