Unusual angular and temperature dependence of the upper critical field in UPt/sub 3/

Shivaram, B S; Rosenbaum, T F; Hinks, D G

doi:10.2172/6452374

Cited by 8 publications

(9 citation statements)

References 9 publications

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“…The magnetic susceptibility of UPt 3 has χ a > χ c which locks d to the caxis. There is then no paramagnetic limiting for H a, but there is for H c (36). For UAu 2 at low pressure, we have χ c > χ a , which would suggest d ⊥ c. If d can rotate within the basal plane (for example, in the E 1u Irr Rep), paramagnetic limiting is avoided for all field directions.…”

Section: Fig 2 (A)mentioning

confidence: 82%

Multicomponent odd-parity superconductivity in UAu ₂ at high pressure

O’Neill

Schmehr

Huxley

2022

Proc. Natl. Acad. Sci. U.S.A.

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We report that high-quality single crystals of the hexagonal heavy fermion material uranium diauride (UAu 2 ) become superconducting at pressures above 3.2 GPa, the pressure at which an unusual antiferromagnetic state is suppressed. The antiferromagnetic state hosts a marginal fermi liquid and the pressure evolution of the resistivity within this state is found to be very different from that approaching a standard quantum phase transition. The superconductivity that appears above this transition survives in high magnetic fields with a large critical field for all field directions. The critical field also has an unusual angle dependence suggesting that the superconductivity may have an order parameter with multiple components. An order parameter consistent with these observations is predicted to host half-quantum vortices (HQVs). Such vortices can be topologically entangled and have potential applications in quantum computing.

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Section: Fig 2 (A)mentioning

confidence: 82%

Multicomponent odd-parity superconductivity in UAu ₂ at high pressure

O’Neill

Schmehr

Huxley

2022

Proc. Natl. Acad. Sci. U.S.A.

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“…In contrast to the INT state, conventional p-wave spin-triplet superconductivity is expected to lead to high upper critical fields, because equal spin pairing is not subject to Pauli limiting, and because most proposed p-wave superconductors are heavy fermion systems with high orbital limit [55][56][57][58][59][60] . LaNiGa 2 , however, is not a heavy-fermion material (γ n = 14.1 mJ mol −1 K −2 ) and interband pairing is suppressed by the application of a strong magnetic field.…”

Section: Resultsmentioning

confidence: 99%

Dirac lines and loop at the Fermi level in the time-reversal symmetry breaking superconductor LaNiGa2

et al. 2022

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Unconventional superconductors have Cooper pairs with lower symmetries than in conventional superconductors. In most unconventional superconductors, the additional symmetry breaking occurs in relation to typical ingredients such as strongly correlated Fermi liquid phases, magnetic fluctuations, or strong spin-orbit coupling in noncentrosymmetric structures. In this article, we show that the time-reversal symmetry breaking in the superconductor LaNiGa2 is enabled by its previously unknown topological electronic band structure, with Dirac lines and a Dirac loop at the Fermi level. Two symmetry related Dirac points even remain degenerate under spin-orbit coupling. These unique topological features enable an unconventional superconducting gap in which time-reversal symmetry can be broken in the absence of other typical ingredients. Our findings provide a route to identify a new type of unconventional superconductors based on nonsymmorphic symmetries and will enable future discoveries of topological crystalline superconductors.

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“…However, using the measured value of (dH c2 /dT ) Tc field of H * c2 (0) = 2.27 T is estimated [283], which is not dissimilar to H c2 (0) values. Measurements of H c2 (T ) for UPt 3 to lower temperatures demonstrated that the anisotropy, characterized by H c2 (T ) > H ⊥ c2 (T ) near T c (where and ⊥ are relative to the crystallographic c axis), reverses below ∼0.2 K so that H c2 (0) < H ⊥ c2 (0) [290]. With the discovery of multiple superconducting phases in UPt 3 [233,288], it was realized that each phase has its own characteristic upper critical fields.…”

Section: Uptmentioning

confidence: 99%

Unconventional superconductivity in heavy-fermion compounds

White

Thompson

Maple

2015

Physica C: Superconductivity and its Applications

126

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Over the past 35 years, research on unconventional superconductivity in heavy-fermion systems has evolved from the surprising observations of unprecedented superconducting properties in compounds that convention dictated should not superconduct at all to performing explorations of rich phase spaces in which the delicate interplay between competing ground states appears to support emergent superconducting states. In this article, we review the current understanding of superconductivity in heavy-fermion compounds and identify a set of characteristics that is common to their unconventional superconducting states. These core properties are compared with those of other classes of unconventional superconductors such as the cuprates and iron-based superconductors. We conclude by speculating on the prospects for future research in this field and how new advances might contribute towards resolving the long-standing mystery of how unconventional superconductivity works.

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Unusual angular and temperature dependence of the upper critical field in UPt/sub 3/

Cited by 8 publications

References 9 publications

Multicomponent odd-parity superconductivity in UAu ₂ at high pressure

Multicomponent odd-parity superconductivity in UAu ₂ at high pressure

Dirac lines and loop at the Fermi level in the time-reversal symmetry breaking superconductor LaNiGa2

Unconventional superconductivity in heavy-fermion compounds

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Unusual angular and temperature dependence of the upper critical field in UPt/sub 3/

Cited by 8 publications

References 9 publications

Multicomponent odd-parity superconductivity in UAu 2 at high pressure

Multicomponent odd-parity superconductivity in UAu 2 at high pressure

Dirac lines and loop at the Fermi level in the time-reversal symmetry breaking superconductor LaNiGa2

Unconventional superconductivity in heavy-fermion compounds

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Multicomponent odd-parity superconductivity in UAu ₂ at high pressure

Multicomponent odd-parity superconductivity in UAu ₂ at high pressure