Topological phase transition under pressure in the topological nodal-line superconductor PbTaSe2
C. Q. Xu, R. Sankar, W. Zhou, Bin Li, Z. D. Han, B. Qian, J. H. Dai, Hengbo Cui, A. F. Bangura, F. C. Chou, Xiaofeng Xu
DOI 10.1103/PhysRevB.96.064528 · Physical Review B
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Abstract
A first-order-like resistivity hysteresis is induced by a subtle structural transition under hydrostatic pressure in the topological nodal-line superconductor PbTaSe2. This structure transition is quickly suppressed to zero at pressure ∼0.25 GPa. As a result, superconductivity shows a marked suppression, accompanied with pronounced changes in the magnetoresistance and Hall resistivity. The first-principles calculations show that the spin-orbit interactions partially gap out the Dirac nodal line around K point in the bulk Brillouin zone upon applying a small pressure, whereas the Dirac states around H point are completely destroyed. The calculations further reveal a second structural phase transition under a pressure as high as ∼30 GPa, through which a transition from a topologically nontrivial bulk phase to a trivial phase is uncovered, with a superconducting dome emerging under this high-pressure phase. Our calculations also reveal how the bulk Fermi surfaces and the surface bands evolve with pressure. This theoretical study shall inspire in-depth experimental investigations on the electronic structure of this novel topological superconductor under higher pressures.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| PbTaSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.9 | Pressure unresolved | onset |
| PbTaSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.9 | 0.05 GPa | onset |
| PbTaSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.9 | 0.21 GPa | onset |
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