Magnetic field dependence of the superconducting gap node topology in noncentrosymmetric CePt3Si
I. Eremin, J. F. Annett
DOI 10.1103/PhysRevB.74.184524 · Physical Review B
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Abstract
Noncentrosymmetric superconductors, such as CePt3Si and Li2PtB2, are believed to have a line node in the energy gap arising from the coexistence of s-wave and p-wave pairing. Using as an example CePt3Si, we show that a weak c-axis magnetic field will remove this line node, since it has no topological stability against time-reversal symmetry-breaking perturbations. Conversely, a field in the a−b plane is shown to remove the line node on some regions of the Fermi surface, while bifurcating the line node in other directions, resulting in two “boomerang”-like shapes. These line-node topological changes are predicted to be observable experimentally in the low-temperature heat capacity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CePt3Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.75 | Pressure not reported | onset |
| Li2Pt3B Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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