{"title":"配对相位受磁沮度的影响。","authors":"A Krindges, C V Morais, M Schmidt, F M Zimmer","doi":"10.1088/1361-648X/ad922b","DOIUrl":null,"url":null,"abstract":"<p><p>The interplay between magnetic frustration and pairing is investigated by adopting a BCS-like pairing mechanism on the frustratedJ1-J2Ising model on the square lattice. The ground-state and thermal phase transitions of the model are analyzed using a fermionic formulation within a CMF method. In this approach, the lattice system is divided into identical clusters, where the intracluster dynamic is exactly solved, and the intercluster interactions are replaced by self-consistent mean fields. We introduce a framework with two pairing couplings: an intracluster local coupling,<i>g</i>, which controls the electron pairing and its mobility within the clusters, and an intercluster coupling,<i>g</i>', which adjusts the pairing mechanism between clusters. Tuningg'/gallows evaluating how the pairing phase evolves from a weak pairing coupling between clusters (clustered system) to a strong one (g'→g, homogeneous system). In the range0⩽g'/g⩽1, we find that a gradual increase ing'/gfavors the pairing phase and induces a change in criticality. In particular, our results reveal the presence of tricriticality for a certain range ofg'/g. In addition, an increase in competing magnetic interactions weakens the magnetic orders, causing the pairing phase to occur at lower strengths of pairing interactions, especially wheng'=g. Therefore, our findings support that magnetic frustration favors the pairing phase, contributing to the onset of a superconducting state.</p>","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3000,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Pairing phase favored by magnetic frustration.\",\"authors\":\"A Krindges, C V Morais, M Schmidt, F M Zimmer\",\"doi\":\"10.1088/1361-648X/ad922b\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>The interplay between magnetic frustration and pairing is investigated by adopting a BCS-like pairing mechanism on the frustratedJ1-J2Ising model on the square lattice. The ground-state and thermal phase transitions of the model are analyzed using a fermionic formulation within a CMF method. In this approach, the lattice system is divided into identical clusters, where the intracluster dynamic is exactly solved, and the intercluster interactions are replaced by self-consistent mean fields. We introduce a framework with two pairing couplings: an intracluster local coupling,<i>g</i>, which controls the electron pairing and its mobility within the clusters, and an intercluster coupling,<i>g</i>', which adjusts the pairing mechanism between clusters. Tuningg'/gallows evaluating how the pairing phase evolves from a weak pairing coupling between clusters (clustered system) to a strong one (g'→g, homogeneous system). In the range0⩽g'/g⩽1, we find that a gradual increase ing'/gfavors the pairing phase and induces a change in criticality. In particular, our results reveal the presence of tricriticality for a certain range ofg'/g. In addition, an increase in competing magnetic interactions weakens the magnetic orders, causing the pairing phase to occur at lower strengths of pairing interactions, especially wheng'=g. Therefore, our findings support that magnetic frustration favors the pairing phase, contributing to the onset of a superconducting state.</p>\",\"PeriodicalId\":16776,\"journal\":{\"name\":\"Journal of Physics: Condensed Matter\",\"volume\":\" \",\"pages\":\"\"},\"PeriodicalIF\":2.3000,\"publicationDate\":\"2024-12-04\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Physics: Condensed Matter\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://doi.org/10.1088/1361-648X/ad922b\",\"RegionNum\":4,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"PHYSICS, CONDENSED MATTER\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Physics: Condensed Matter","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1088/1361-648X/ad922b","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"PHYSICS, CONDENSED MATTER","Score":null,"Total":0}
The interplay between magnetic frustration and pairing is investigated by adopting a BCS-like pairing mechanism on the frustratedJ1-J2Ising model on the square lattice. The ground-state and thermal phase transitions of the model are analyzed using a fermionic formulation within a CMF method. In this approach, the lattice system is divided into identical clusters, where the intracluster dynamic is exactly solved, and the intercluster interactions are replaced by self-consistent mean fields. We introduce a framework with two pairing couplings: an intracluster local coupling,g, which controls the electron pairing and its mobility within the clusters, and an intercluster coupling,g', which adjusts the pairing mechanism between clusters. Tuningg'/gallows evaluating how the pairing phase evolves from a weak pairing coupling between clusters (clustered system) to a strong one (g'→g, homogeneous system). In the range0⩽g'/g⩽1, we find that a gradual increase ing'/gfavors the pairing phase and induces a change in criticality. In particular, our results reveal the presence of tricriticality for a certain range ofg'/g. In addition, an increase in competing magnetic interactions weakens the magnetic orders, causing the pairing phase to occur at lower strengths of pairing interactions, especially wheng'=g. Therefore, our findings support that magnetic frustration favors the pairing phase, contributing to the onset of a superconducting state.
期刊介绍:
Journal of Physics: Condensed Matter covers the whole of condensed matter physics including soft condensed matter and nanostructures. Papers may report experimental, theoretical and simulation studies. Note that papers must contain fundamental condensed matter science: papers reporting methods of materials preparation or properties of materials without novel condensed matter content will not be accepted.