Periodic Anderson model for magnetism and superconductivity in UTe 2
Jun Ishizuka,Youichi Yanase +1 more
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TLDR
In this paper, a periodic Anderson model for studying magnetism and superconductivity in a topological spin-triplet superconductor was proposed, and the Coulomb interaction of $f$-electrons enhances Ising ferromagnetic fluctuation along the $a$-axis and stabilizes spin triplet superconductivities of either ${B}{3u} or ${A}_{u}$ symmetry.Abstract:
We provide and analyze a periodic Anderson model for studying magnetism and superconductivity in $\mathrm{U}{\mathrm{Te}}_{2}$, a recently discovered candidate for a topological spin-triplet superconductor. The 24-band tight-binding model reproduces the band structure obtained from a $\mathrm{D}\mathrm{F}\mathrm{T}+U$ calculation consistent with an angle-resolved photoemission spectroscopy. The Coulomb interaction of $f$-electrons enhances Ising ferromagnetic fluctuation along the $a$-axis and stabilizes spin-triplet superconductivity of either ${B}_{3u}$ or ${A}_{u}$ symmetry. When effects of pressure are taken into account in hopping integrals, the magnetic fluctuation changes to an antiferromagnetic one, and accordingly spin-singlet superconductivity of ${A}_{g}$ symmetry is stabilized. Based on the results, we propose pressure-temperature and magnetic field-temperature phase diagrams revealing multiple superconducting phases as well as an antiferromagnetic phase. In particular, a mixed-parity superconducting state with spontaneous inversion symmetry breaking is predicted.read more
Citations
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Unconventional Superconductivity in Heavy Fermion UTe2
Dai Aoki,Dai Aoki,Ai Nakamura,Fuminori Honda,Dexin Li,Yoshiya Homma,Yusei Shimizu,Yoshiki Sato,Georg Knebel,Jean-Pascal Brison,Alexandre Pourret,Daniel Braithwaite,Gérard Lapertot,Q. Niu,Michal Vališka,Hisatomo Harima,Jacques Flouquet +16 more
TL;DR: In this article, the authors measured the resistivity, specific heat and magnetoresistance of UTe2 and found that the specific heat shows a large jump at Tsc indicating strong coupling.
Journal ArticleDOI
Field-induced transition within the superconducting state of CeRh2As2
S. Khim,S. Khim,J. F. Landaeta,J. Banda,J. Banda,N. Bannor,Manuel Brando,P. M. R. Brydon,D. Hafner,R. Küchler,R. Cardoso-Gil,R. Cardoso-Gil,R. Cardoso-Gil,U. Stockert,U. Stockert,Andrew P. Mackenzie,Daniel F. Agterberg,Daniel F. Agterberg,C. Geibel,Elena Hassinger,Elena Hassinger +20 more
TL;DR: In this article, the authors reported the discovery of two-phase unconventional superconductivity in CeRh2As2 using thermodynamic probes, and established that the superconducting critical field of its high-field phase is as high as 14 tesla, even though the transition temperature is only 0.26 kelvin.
Journal ArticleDOI
Unconventional superconductivity in UTe<sub>2</sub>
TL;DR: The spin-triplet superconductor candidate UTe2 was discovered only recently at the end of 2018 and already attracted enormous attention as mentioned in this paper , showing an exceptionally huge superconducting upper critical field with a reentrant behavior under magnetic field and the occurrence of multiple super-conducting phases in the temperature-field-pressure phase diagrams.
Journal ArticleDOI
Low-dimensional antiferromagnetic fluctuations in the heavy-fermion paramagnetic ladder compound UTe 2
W. Knafo,Georg Knebel,Paul Steffens,Koji Kaneko,A. Rosuel,Jean-Pascal Brison,Jacques Flouquet,Daisuke Aoki,Gérard Lapertot,Stéphane Raymond +9 more
TL;DR: In this paper, a quasielastic signal was found, whose momentum-transfer dependence is compatible with fluctuations of magnetic moments with a sine-wave modulation of wave-vector and in-phase moments on the nearest U atoms.
References
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Xiao-Liang Qi,Shou-Cheng Zhang +1 more
TL;DR: Topological superconductors are new states of quantum matter which cannot be adiabatically connected to conventional insulators and semiconductors and are characterized by a full insulating gap in the bulk and gapless edge or surface states which are protected by time reversal symmetry.
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Masatoshi Sato,Yoichi Ando +1 more
TL;DR: In this paper, the relation between topological superconductivity and Majorana fermions is explained, and the difference between dispersive Majorana Fermions and a localized Majorana zero mode is emphasized.
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