Pairing interaction in superconducting UCoGe tunable by magnetic field
| Autor: | Dai Aoki, Tetsuya Hattori, Takahiko Sasaki, Keiichi Ishida, Masahiro Manago, Satoshi Matsuzaki, Michihiro Hirata, Susumu Kitagawa |
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| Přispěvatelé: | Kyoto University, Tohoku University [Sendai], Instrumentation, Material and Correlated Electrons Physics (IMAPEC), PHotonique, ELectronique et Ingénierie QuantiqueS (PHELIQS), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA) |
| Rok vydání: | 2021 |
| Předmět: |
Superconductivity
Physics [PHYS]Physics [physics] Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) Phonon Condensed Matter - Superconductivity FOS: Physical sciences Ferromagnetic superconductor Magnetic field Superconductivity (cond-mat.supr-con) Condensed Matter - Strongly Correlated Electrons [SPI]Engineering Sciences [physics] Ferromagnetism Pairing Condensed Matter::Superconductivity Condensed Matter::Strongly Correlated Electrons Cooper pair Spin-½ |
| Zdroj: | Physical Review B Physical Review B, 2021, 104 (14), pp.144505. ⟨10.1103/PhysRevB.104.144505⟩ |
| ISSN: | 2469-9950 2469-9969 |
| DOI: | 10.48550/arxiv.2109.14426 |
| Popis: | The mechanism of unconventional superconductivity, such as high-temperature-cuprate, Fe-based, and heavy-fermion superconductors, has been studied as a central issue in condensed-matter physics. Spin fluctuations, instead of phonons, are considered to be responsible for the formation of Cooper pairs, and many efforts have been made to confirm this mechanism experimentally. Although a qualitative consensus seems to have been obtained, experimental confirmation has not yet been achieved. This is owing to a lack of the quantitative comparison between theory and experiments. Here, we show a semi-quantitative comparison between the superconducting-transition temperature ($T_{\rm SC}$) and spin fluctuations derived from the nuclear magnetic resonance (NMR) experiment on the ferromagnetic (FM) superconductor UCoGe, in which the FM fluctuations and superconductivity are tunable by external fields. The enhancement and abrupt suppression of $T_{\rm SC}$ by applied fields, as well as the pressure variation of $T_{\rm SC}$ around the FM criticality are well understood by the change in the FM fluctuations on the basis of the single-band spin-triplet theoretical formalism. The present comparisons strongly support the theoretical formalism of spin-fluctuation-mediated superconductivity, particularly in UCoGe. Comment: 10 pages, 8 pages. To be published in Phys. Rev. B |
| Databáze: | OpenAIRE |
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