Coexistence of local magnetism and superconductivity in the heavy-fermion compound CeRh2As2 revealed by μSR studies
Seunghyun Khim, Oliver Stockert, Manuel Brando, Christoph Geibel, Chirstopher Baines, Thomas J. Hicken, Hubertus Luetkens, Debarchan Das, Toni Shiroka, Zurab Guguchia, Robert Scheuermann
DOI 10.1103/PhysRevB.111.115134 · Physical Review B
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Abstract
The superconducting (SC) state (Tc=0.3K) of the heavy-fermion compound CeRh2As2, which undergoes an unusual field-induced transition to another high-field SC state, emerges from an unknown ordered state below To=0.55K. While an electronic multipolar order of itinerant Ce−4f states was proposed to account for the To phase, the exact order parameter has not been known to date. Here, we report on muon spin relaxation (μSR) studies of the magnetic and SC properties in CeRh2As2 single crystals at low temperatures. We reveal a magnetic origin of the To order by identifying a spontaneous internal field below To=0.55K. Furthermore, we find evidence of a microscopic coexistence of local magnetism with bulk superconductivity. Our results suggest the possibility that the To phase involves both dipole and higher-order Ce−4f moments to account for the unusual shape of the To(B) phase boundary.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeRh2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.3 | Pressure not reported | unknown |
| CeRh2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.3 | Pressure not reported | unknown |
| UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| UBe13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| UTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| CeSb2 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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