Multiple Superconducting Phases and Unusual Enhancement of the Upper Critical Field in UTe2
Dai Aoki,Dai Aoki,Fuminori Honda,Georg Knebel,Daniel Braithwaite,A. Nakamura,Dexin Li,Yoshiya Homma,Yusei Shimizu,Yoshiki Sato,Jean-Pascal Brison,Jacques Flouquet +11 more
TLDR
In this article, the authors performed AC calorimetry and magnetoresistance measurements under pressure for H || a-axis (easy-magnetization axis) in the novel heavy-fermion superconductor UTe2.Abstract:
We performed AC calorimetry and magnetoresistance measurements under pressure for H || a-axis (easy-magnetization axis) in the novel heavy-fermion superconductor UTe2. Thanks to the thermodynamic information, multiple superconducting phases have been revealed under pressure and magnetic field. The (H,T) phase diagram of superconductivity under pressure displays an abrupt increase of the upper critical field (Hc2) at low temperature and in the high field region, and a strong convex curvature of Hc2 at high temperature. This behavior of Hc2 and the multiple superconducting phases require a state for the superconducting order parameter more complex than a spin-triplet equal spin pairing. Above the superconducting critical pressure, Pc, we find strong indications that the possible magnetic order is closer to antiferromagnetism than to ferromagnetism.read more
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Evidence for a pressure-induced antiferromagnetic quantum critical point in intermediate-valence UTe2.
Sean Thomas,F.B. Santos,F.B. Santos,Morten Christensen,Tomoya Asaba,Filip Ronning,Joe D. Thompson,Eric D. Bauer,Rafael M. Fernandes,Gilberto Fabbris,Priscila Rosa +10 more
TL;DR: The results suggest that antiferromagnetic fluctuations may play a more substantial role on the superconducting state of UTe2 than previously thought.
Journal ArticleDOI
Periodic Anderson model for magnetism and superconductivity in UTe 2
Jun Ishizuka,Youichi Yanase +1 more
TL;DR: 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.
Journal ArticleDOI
Orientation of point nodes and nonunitary triplet pairing tuned by the easy-axis magnetization in UTe2
Shunichiro Kittaka,Shunichiro Kittaka,Yusei Shimizu,Toshiro Sakakibara,A. Nakamura,Dexin Li,Yoshiya Homma,Fuminori Honda,Dai Aoki,Kazushige Machida +9 more
TL;DR: In this article, the field-angle dependencies of high-quality single crystal of UTe${}_{2}$ in standard and superconductivity states were studied and the results suggest the presence of point nodes along the $a$ axis in the superconducting gap.
Journal ArticleDOI
Comparison of two superconducting phases induced by a magnetic field in UTe2
William Knafo,Marc Nardone,Michal Vališka,Michal Vališka,A. Zitouni,Gérard Lapertot,Dai Aoki,Dai Aoki,Georg Knebel,D. Braithwaite +9 more
TL;DR: In this paper, the phase diagram of UTe2 under two magnetic field directions: the hard magnetization axis b, and a direction titled by ≃25-30° from b in the (b,c) plane.
Journal ArticleDOI
Electronic multipoles and multiplet pairs induced by Pomeranchuk and Cooper instabilities of Bogoliubov Fermi surfaces
TL;DR: In this paper, the authors studied the instability of superconductors with multiple phase transitions and classified the ordered states into diagonal and off-diagonal ones, respectively, indicating the Pomeranchuk instability and Cooper pairing not of original electrons but of Bogoliubov particles (bogolons).
References
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Journal ArticleDOI
Topological band and superconductivity in UTe 2
TL;DR: In this article, it was shown that inversion-symmetry related pairs of U atoms, forming rungs of ladders, play a key role in understanding the electronic structure and the origin of superconductivity.
Journal ArticleDOI
Periodic Anderson model for magnetism and superconductivity in UTe 2
Jun Ishizuka,Youichi Yanase +1 more
TL;DR: 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.
Journal ArticleDOI
Evidence for a pressure-induced antiferromagnetic quantum critical point in intermediate valence UTe2
Sean Thomas,F.B. Santos,F.B. Santos,Morten Christensen,Tomoya Asaba,Filip Ronning,Joe D. Thompson,Eric D. Bauer,Rafael M. Fernandes,Gilberto Fabbris,Priscila Rosa +10 more
TL;DR: In this article, an ac calorimetry, electrical resistivity, and x-ray absorption study of UTe$_2$ under applied pressure reveals key new insights on the superconducting and magnetic states surrounding pressure-induced quantum criticality at P$_{c1}$ = 1.3 GPa.
Journal ArticleDOI
Orientation of point nodes and nonunitary triplet pairing tuned by the easy-axis magnetization in UTe2
Shunichiro Kittaka,Shunichiro Kittaka,Yusei Shimizu,Toshiro Sakakibara,A. Nakamura,Dexin Li,Yoshiya Homma,Fuminori Honda,Dai Aoki,Kazushige Machida +9 more
TL;DR: In this article, the field-angle dependencies of high-quality single crystal of UTe${}_{2}$ in standard and superconductivity states were studied and the results suggest the presence of point nodes along the $a$ axis in the superconducting gap.
Journal ArticleDOI
Comparison of two superconducting phases induced by a magnetic field in UTe2
William Knafo,Marc Nardone,Michal Vališka,Michal Vališka,A. Zitouni,Gérard Lapertot,Dai Aoki,Dai Aoki,Georg Knebel,D. Braithwaite +9 more
TL;DR: In this paper, the phase diagram of UTe2 under two magnetic field directions: the hard magnetization axis b, and a direction titled by ≃25-30° from b in the (b,c) plane.