Stabilization of the vortex-liquid state by strong pairing interaction
We theoretically investigate qualitative features of the field-temperature (H−T) phase diagram of superconductors with strong attractive interaction lying in the BCS-BEC crossover regime. Starting with a simple attractive Hubbard model, we estimate three kinds of characteristic fields, i.e., the pai...
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| Veröffentlicht in: | Physical review. B 2019-02, Vol.99 (6), p.064508, Article 064508 |
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| container_title | Physical review. B |
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| creator | Adachi, Kyosuke Ikeda, Ryusuke |
| description | We theoretically investigate qualitative features of the field-temperature (H−T) phase diagram of superconductors with strong attractive interaction lying in the BCS-BEC crossover regime. Starting with a simple attractive Hubbard model, we estimate three kinds of characteristic fields, i.e., the pair-formation field H*, the vortex-liquid-formation field Hc2, and the vortex-lattice-formation field Hmelt. The region between Hc2 and Hmelt, as well as that between Hc2 and H*, is found to be enlarged as the interaction is stronger. In other words, a strong attractive interaction can stabilize both the vortex-liquid and preformed-pair regions. We also point out the expected particle-density dependence of the H−T phase diagram. |
| doi_str_mv | 10.1103/PhysRevB.99.064508 |
| format | Article |
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Starting with a simple attractive Hubbard model, we estimate three kinds of characteristic fields, i.e., the pair-formation field H*, the vortex-liquid-formation field Hc2, and the vortex-lattice-formation field Hmelt. The region between Hc2 and Hmelt, as well as that between Hc2 and H*, is found to be enlarged as the interaction is stronger. In other words, a strong attractive interaction can stabilize both the vortex-liquid and preformed-pair regions. We also point out the expected particle-density dependence of the H−T phase diagram.</description><identifier>ISSN: 2469-9950</identifier><identifier>EISSN: 2469-9969</identifier><identifier>DOI: 10.1103/PhysRevB.99.064508</identifier><language>eng</language><publisher>College Park: American Physical Society</publisher><subject>Crossovers ; Dependence ; Phase diagrams ; Vortices</subject><ispartof>Physical review. 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B</title><description>We theoretically investigate qualitative features of the field-temperature (H−T) phase diagram of superconductors with strong attractive interaction lying in the BCS-BEC crossover regime. Starting with a simple attractive Hubbard model, we estimate three kinds of characteristic fields, i.e., the pair-formation field H*, the vortex-liquid-formation field Hc2, and the vortex-lattice-formation field Hmelt. The region between Hc2 and Hmelt, as well as that between Hc2 and H*, is found to be enlarged as the interaction is stronger. In other words, a strong attractive interaction can stabilize both the vortex-liquid and preformed-pair regions. 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B</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Adachi, Kyosuke</au><au>Ikeda, Ryusuke</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Stabilization of the vortex-liquid state by strong pairing interaction</atitle><jtitle>Physical review. B</jtitle><date>2019-02-15</date><risdate>2019</risdate><volume>99</volume><issue>6</issue><spage>064508</spage><pages>064508-</pages><artnum>064508</artnum><issn>2469-9950</issn><eissn>2469-9969</eissn><abstract>We theoretically investigate qualitative features of the field-temperature (H−T) phase diagram of superconductors with strong attractive interaction lying in the BCS-BEC crossover regime. Starting with a simple attractive Hubbard model, we estimate three kinds of characteristic fields, i.e., the pair-formation field H*, the vortex-liquid-formation field Hc2, and the vortex-lattice-formation field Hmelt. The region between Hc2 and Hmelt, as well as that between Hc2 and H*, is found to be enlarged as the interaction is stronger. In other words, a strong attractive interaction can stabilize both the vortex-liquid and preformed-pair regions. We also point out the expected particle-density dependence of the H−T phase diagram.</abstract><cop>College Park</cop><pub>American Physical Society</pub><doi>10.1103/PhysRevB.99.064508</doi></addata></record> |
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| ispartof | Physical review. B, 2019-02, Vol.99 (6), p.064508, Article 064508 |
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| source | APS_美国物理学会期刊 |
| subjects | Crossovers Dependence Phase diagrams Vortices |
| title | Stabilization of the vortex-liquid state by strong pairing interaction |
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