Magnetic Signatures of Pressure-Induced Multicomponent Superconductivity in UTe2
Zheyu Wu, Jiasheng Chen, Theodore I. Weinberger, Andrej Cabala, Vladimír Sechovský, Michal Vališka, Patricia L. Alireza, Alexander G. Eaton, F. Malte Grosche
DOI 10.1103/PhysRevLett.134.236501 · Physical Review Letters
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Abstract
The phase diagram of the heavy fermion compound UTe2 contains multiple superconducting phases, several of which show characteristics of odd-parity pairing. We have investigated the pressure dependence of the superconducting transition in high-quality crystals of UTe2 by tracking its signature in the magnetic susceptibility χ(T). A single, sharp superconducting transition is observed at low pressures <0.3 GPa. At higher pressure, a second feature emerges in χ(T), which is located at the lower-temperature superconducting phase boundary previously identified in specific heat measurements. This second transition anomaly in χ(T) can be attributed to a step change in the London penetration depth, providing direct evidence for a change in the superconducting order parameter of UTe2. Thermodynamic constraints suggest that the low temperature, high pressure superconducting state is distinct from zero pressure superconductivity as well as from the high pressure, high temperature superconducting state, raising the possibility of multicomponent superconductivity in high pressure UTe2.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| UTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.16 | 0.74 GPa | onset |
| UTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.92 | 1.42 GPa | unknown |
| UTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.85 | 1.42 GPa | unknown |
| UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| U1-xThxBe13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| URhGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| CeRh2As2 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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