Magnetic and thermodynamic properties of Cu\(_x\)TiSe\(_2\) single crystals
We present a detailed study of the phase diagram of copper intercalated TiSe\(_2\) single crystals, combining local Hall-probe magnetometry, tunnel diode oscillator technique (TDO), specific-heat, and angle-resolved photoemission spectroscopy measurements. A series of the Cu\(_x\)TiSe\(_2\) samples...
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| creator | Pribulová, Z Medvecká, Z Kačmarčík, J Komanický, V Klein, T Rodière, P Levy-Bertrand, F Michon, B Marcenat, C Husaníková, P Cambel, V Šoltýs, J Karapetrov, G Borisenko, S Evtushinsky, D Berger, H Samuely, P |
| description | We present a detailed study of the phase diagram of copper intercalated TiSe\(_2\) single crystals, combining local Hall-probe magnetometry, tunnel diode oscillator technique (TDO), specific-heat, and angle-resolved photoemission spectroscopy measurements. A series of the Cu\(_x\)TiSe\(_2\) samples from three different sources with various copper content \(x\) and superconducting critical temperatures \(T_c\) have been investigated. We first show that the vortex penetration mechanism is dominated by geometrical barriers enabling a precise determination of the lower critical field, \(H_{c1}\). We then show that the temperature dependence of the superfluid density deduced from magnetic measurements (both \(H_{c1}\) and TDO techniques) clearly suggests the existence of a small energy gap in the system, with a coupling strength \(2\Delta_s \sim [2.4-2.8]k_BT_c\), regardless of the copper content, in puzzling contradiction with specific heat measurements which can be well described by one single large gap \(2\Delta_l \sim [3.7-3.9]k_BT_c\). Finally, our measurements reveal a non-trivial doping dependence of the condensation energy, which remains to be understood. |
| doi_str_mv | 10.48550/arxiv.1704.08463 |
| format | Article |
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A series of the Cu\(_x\)TiSe\(_2\) samples from three different sources with various copper content \(x\) and superconducting critical temperatures \(T_c\) have been investigated. We first show that the vortex penetration mechanism is dominated by geometrical barriers enabling a precise determination of the lower critical field, \(H_{c1}\). We then show that the temperature dependence of the superfluid density deduced from magnetic measurements (both \(H_{c1}\) and TDO techniques) clearly suggests the existence of a small energy gap in the system, with a coupling strength \(2\Delta_s \sim [2.4-2.8]k_BT_c\), regardless of the copper content, in puzzling contradiction with specific heat measurements which can be well described by one single large gap \(2\Delta_l \sim [3.7-3.9]k_BT_c\). Finally, our measurements reveal a non-trivial doping dependence of the condensation energy, which remains to be understood.</description><identifier>EISSN: 2331-8422</identifier><identifier>DOI: 10.48550/arxiv.1704.08463</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Copper ; Critical field (superconductivity) ; Energy gap ; Fluids ; Magnetic measurement ; Magnetic properties ; Phase diagrams ; Photoelectric emission ; Single crystals ; Superfluidity ; Temperature dependence ; Thermodynamic properties ; Tunnel diodes</subject><ispartof>arXiv.org, 2017-06</ispartof><rights>2017. This work is published under http://arxiv.org/licenses/nonexclusive-distrib/1.0/ (the “License”). 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A series of the Cu\(_x\)TiSe\(_2\) samples from three different sources with various copper content \(x\) and superconducting critical temperatures \(T_c\) have been investigated. We first show that the vortex penetration mechanism is dominated by geometrical barriers enabling a precise determination of the lower critical field, \(H_{c1}\). We then show that the temperature dependence of the superfluid density deduced from magnetic measurements (both \(H_{c1}\) and TDO techniques) clearly suggests the existence of a small energy gap in the system, with a coupling strength \(2\Delta_s \sim [2.4-2.8]k_BT_c\), regardless of the copper content, in puzzling contradiction with specific heat measurements which can be well described by one single large gap \(2\Delta_l \sim [3.7-3.9]k_BT_c\). Finally, our measurements reveal a non-trivial doping dependence of the condensation energy, which remains to be understood.</description><subject>Copper</subject><subject>Critical field (superconductivity)</subject><subject>Energy gap</subject><subject>Fluids</subject><subject>Magnetic measurement</subject><subject>Magnetic properties</subject><subject>Phase diagrams</subject><subject>Photoelectric emission</subject><subject>Single crystals</subject><subject>Superfluidity</subject><subject>Temperature dependence</subject><subject>Thermodynamic properties</subject><subject>Tunnel diodes</subject><issn>2331-8422</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNqNjL0KwjAYRYMgKNoHcAu42MH6NX_tXhRBnHQslKCxprSpJqno25vBB3A6l3suF6FFCgnLOYeNtG_9StIMWAI5E3SEpoTSdJ0zQiYocq4BACIywjmdosNR1kZ5fcHSXLG_K9v114-RXWgetn8o67VyuL_hYihX1buMz_qkQiJljJ02davwxX6cl62bo_EtQEU_ztBytz0X-3U4eg7K-arpB2uCqghkAkAIyul_qy_wL0K5</recordid><startdate>20170605</startdate><enddate>20170605</enddate><creator>Pribulová, Z</creator><creator>Medvecká, Z</creator><creator>Kačmarčík, J</creator><creator>Komanický, V</creator><creator>Klein, T</creator><creator>Rodière, P</creator><creator>Levy-Bertrand, F</creator><creator>Michon, B</creator><creator>Marcenat, C</creator><creator>Husaníková, P</creator><creator>Cambel, V</creator><creator>Šoltýs, J</creator><creator>Karapetrov, G</creator><creator>Borisenko, S</creator><creator>Evtushinsky, D</creator><creator>Berger, H</creator><creator>Samuely, P</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></search><sort><creationdate>20170605</creationdate><title>Magnetic and thermodynamic properties of Cu\(_x\)TiSe\(_2\) single crystals</title><author>Pribulová, Z ; 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A series of the Cu\(_x\)TiSe\(_2\) samples from three different sources with various copper content \(x\) and superconducting critical temperatures \(T_c\) have been investigated. We first show that the vortex penetration mechanism is dominated by geometrical barriers enabling a precise determination of the lower critical field, \(H_{c1}\). We then show that the temperature dependence of the superfluid density deduced from magnetic measurements (both \(H_{c1}\) and TDO techniques) clearly suggests the existence of a small energy gap in the system, with a coupling strength \(2\Delta_s \sim [2.4-2.8]k_BT_c\), regardless of the copper content, in puzzling contradiction with specific heat measurements which can be well described by one single large gap \(2\Delta_l \sim [3.7-3.9]k_BT_c\). 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| subjects | Copper Critical field (superconductivity) Energy gap Fluids Magnetic measurement Magnetic properties Phase diagrams Photoelectric emission Single crystals Superfluidity Temperature dependence Thermodynamic properties Tunnel diodes |
| title | Magnetic and thermodynamic properties of Cu\(_x\)TiSe\(_2\) single crystals |
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