scholarly journals Tuning magnetic confinement of spin-triplet superconductivity

2020 ◽  
Vol 5 (1) ◽  
Author(s):  
Wen-Chen Lin ◽  
Daniel J. Campbell ◽  
Sheng Ran ◽  
I-Lin Liu ◽  
Hyunsoo Kim ◽  
...  
Keyword(s):  
Applied Pressure ◽  
Upper Critical Field ◽  
Magnetic Confinement ◽  
Superconducting Phase ◽  
Zero Field ◽  
First Order ◽  
Diode Oscillator ◽  
Spin Triplet ◽  
First Order Transition ◽  
Tunnel Diode Oscillator

Abstract Electrical magnetoresistance and tunnel diode oscillator measurements were performed under external magnetic fields up to 41 T applied along the crystallographic b axis (hard axis) of UTe2 as a function of temperature and applied pressures up to 18.8 kbar. In this work, we track the field-induced first-order transition between superconducting and magnetic field-polarized phases as a function of applied pressure, showing suppression of the transition with increasing pressure until the demise of superconductivity near 16 kbar and the appearance of a pressure-induced ferromagnetic-like ground state that is distinct from the field-polarized phase and stable at zero field. Together with evidence for the evolution of a second superconducting phase and its upper critical field with pressure, we examine the confinement of superconductivity by two orthogonal magnetic phases and the implications for understanding the boundaries of triplet superconductivity.

scholarly journals Expansion of the high field-boosted superconductivity in UTe2 under pressure

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Sheng Ran ◽  
Shanta R. Saha ◽  
I-Lin Liu ◽  
David Graf ◽  
Johnpierre Paglione ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Field ◽  
Superconducting Phase ◽  
High Symmetry ◽  
First Order ◽  
Superconducting Phases ◽  
Quantum Phenomenon ◽  
Zero Resistance ◽  
Spin Triplet ◽  
The Magnetic Field

AbstractMagnetic field-induced superconductivity is a fascinating quantum phenomenon, whose origin is yet to be fully understood. The recently discovered spin-triplet superconductor, UTe2, exhibits two such superconducting phases, with the second one reentering in the magnetic field of 45 T and persisting up to 65 T. More surprisingly, in order to induce this superconducting phase, the magnetic field has to be applied in a special angle range, not along any high symmetry crystalline direction. Here we investigated the evolution of this high-field-induced superconducting phase under pressure. Two superconducting phases merge together under pressure, and the zero resistance persists up to 45 T, the field limit of the current study. We also reveal that the high-field-induced superconducting phase is completely decoupled from the first-order field-polarized phase transition, different from the previously known example of field-induced superconductivity in URhGe, indicating superconductivity boosted by a different paring mechanism.

Zero field first order transition in the YBa2Cu3O7 superconducting state

1994 ◽  
Vol 235-240 ◽  
pp. 2855-2856 ◽  
Author(s):  
J.M. Barbut ◽  
D. Bourgault ◽  
N. Schopohl ◽  
R. Tournier
Keyword(s):  
Superconducting State ◽  
Order Transition ◽  
Zero Field ◽  
First Order ◽  
First Order Transition

scholarly journals Nearly ferromagnetic spin-triplet superconductivity

Science ◽  
2019 ◽  
Vol 365 (6454) ◽  
pp. 684-687 ◽  
Author(s):  
Sheng Ran ◽  
Chris Eckberg ◽  
Qing-Ping Ding ◽  
Yuji Furukawa ◽  
Tristin Metz ◽  
...  
Keyword(s):  
Quantum Information ◽  
Transition Temperature ◽  
Magnetic Order ◽  
Quantum Information Processing ◽  
Upper Critical Field ◽  
Superconducting Phase ◽  
Zero Temperature ◽  
Topological Excitations ◽  
Spin Triplet ◽  
Superconducting Pairing

Spin-triplet superconductors potentially host topological excitations that are of interest for quantum information processing. We report the discovery of spin-triplet superconductivity in UTe2, featuring a transition temperature of 1.6 kelvin and a very large and anisotropic upper critical field exceeding 40 teslas. This superconducting phase stability suggests that UTe2 is related to ferromagnetic superconductors such as UGe2, URhGe, and UCoGe. However, the lack of magnetic order and the observation of quantum critical scaling place UTe2 at the paramagnetic end of this ferromagnetic superconductor series. A large intrinsic zero-temperature reservoir of ungapped fermions indicates a highly unconventional type of superconducting pairing.

scholarly journals SUPERCONDUCTIVITY AND QUANTUM PHASE TRANSITIONS IN WEAK ITINERANT FERROMAGNETS

2003 ◽  
Vol 17 (28) ◽  
pp. 5081-5091
Author(s):  
T. R. KIRKPATRICK ◽  
THOMAS VOJTA ◽  
D. BELITZ ◽  
R. NARAYANAN
Keyword(s):  
Quantum Phase Transitions ◽  
Tricritical Point ◽  
Spin Fluctuations ◽  
P Wave ◽  
Ferromagnetic Phase ◽  
Correlation Effects ◽  
First Order ◽  
Spin Triplet ◽  
First Order Transition ◽  
Itinerant Ferromagnets

It is argued that the phase transition in low Tc clean itinerant ferromagnets is generically of first order, due to correlation effects that lead to a nonanalytic term in the free energy. A tricritical point separates the line of first order transitions from Heisenberg critical behavior at higher temperatures. Sufficiently strong quenched disorder suppresses the first order transition via the appearance of a critical endpoint. A semi-quantitative discussion is given in terms of recent experiments on MnSi and UGe 2. It is then shown that the critical temperature for spin-triplet, p-wave superconductivity mediated by spin fluctuations is generically much higher in a Heisenberg ferromagnetic phase than in a paramagnetic one, due to the coupling of magnons to the longitudinal magnetic susceptibility. This qualitatively explains the phase diagram recently observed in UGe 2 and ZrZn 2.

scholarly journals The Effect of Topology on Phase Behavior under Confinement

Processes ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 1220
Author(s):  
Arnout M. P. Boelens ◽  
Hamdi A. Tchelepi
Keyword(s):  
Phase Behavior ◽  
Density Functional ◽  
Capillary Condensation ◽  
Good Description ◽  
Functional Theory ◽  
Minkowski Functionals ◽  
First Order ◽  
Lennard Jones ◽  
And Topology ◽  
First Order Transition

This work studies how morphology (i.e., the shape of a structure) and topology (i.e., how different structures are connected) influence wall adsorption and capillary condensation under tight confinement. Numerical simulations based on classical density functional theory (cDFT) are run for a wide variety of geometries using both hard-sphere and Lennard-Jones fluids. These cDFT computations are compared to results obtained using the Minkowski functionals. It is found that the Minkowski functionals can provide a good description of the behavior of Lennard-Jones fluids down to small system sizes. In addition, through decomposition of the free energy, the Minkowski functionals provide a good framework to better understand what are the dominant contributions to the phase behavior of a system. Lastly, while studying the phase envelope shift as a function of the Minkowski functionals it is found that topology has a different effect depending on whether the phase transition under consideration is a continuous or a discrete (first-order) transition.

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