Coexistence of local magnetism and superconductivity in the heavy-fermion CeRh$_2$As$_2$ revealed by $μ$SR studies
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arXiv
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| Autori principali: | , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866909734504759296 |
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| author | Khim, Seunghyun Stockert, Oliver Brando, Manuel Geibel, Christoph Baines, Chirstopher Hicken, Thomas J. Luetkens, Hubertus Das, Debarchan Shiroka, Toni Guguchia, Zurab Scheuermann, Robert |
| author_facet | Khim, Seunghyun Stockert, Oliver Brando, Manuel Geibel, Christoph Baines, Chirstopher Hicken, Thomas J. Luetkens, Hubertus Das, Debarchan Shiroka, Toni Guguchia, Zurab Scheuermann, Robert |
| contents | The superconducting (SC) state ($T_\mathrm{c}$ = 0.3 K) of the heavy-fermion compound CeRh$_2$As$_2$, which undergoes an unusual field-induced transition to another high-field SC state, emerges from an unknown ordered state below $T_\mathrm{o}$ = 0.55 K. While an electronic multipolar order of itinerant Ce-4$f$ states was proposed to account for the $T_\mathrm{o}$ phase, the exact order parameter has not been known to date. Here, we report on muon spin relaxation ($μ$SR) studies of the magnetic and SC properties in CeRh$_2$As$_2$ single crystals at low temperatures. We reveal a magnetic origin of the $T_\mathrm{o}$ order by identifying a spontaneous internal field below $T_\mathrm{o}$ = 0.55 K. Furthermore, we find evidence of a microscopic coexistence of local magnetism with bulk superconductivity. Our findings open the possibility that the $T_\mathrm{o}$ phase involves both dipole and higher order Ce-4$f$ moment degrees of freedom and accounts for the unusual non-Fermi liquid behavior. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_16575 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Coexistence of local magnetism and superconductivity in the heavy-fermion CeRh$_2$As$_2$ revealed by $μ$SR studies Khim, Seunghyun Stockert, Oliver Brando, Manuel Geibel, Christoph Baines, Chirstopher Hicken, Thomas J. Luetkens, Hubertus Das, Debarchan Shiroka, Toni Guguchia, Zurab Scheuermann, Robert Strongly Correlated Electrons Superconductivity The superconducting (SC) state ($T_\mathrm{c}$ = 0.3 K) of the heavy-fermion compound CeRh$_2$As$_2$, which undergoes an unusual field-induced transition to another high-field SC state, emerges from an unknown ordered state below $T_\mathrm{o}$ = 0.55 K. While an electronic multipolar order of itinerant Ce-4$f$ states was proposed to account for the $T_\mathrm{o}$ phase, the exact order parameter has not been known to date. Here, we report on muon spin relaxation ($μ$SR) studies of the magnetic and SC properties in CeRh$_2$As$_2$ single crystals at low temperatures. We reveal a magnetic origin of the $T_\mathrm{o}$ order by identifying a spontaneous internal field below $T_\mathrm{o}$ = 0.55 K. Furthermore, we find evidence of a microscopic coexistence of local magnetism with bulk superconductivity. Our findings open the possibility that the $T_\mathrm{o}$ phase involves both dipole and higher order Ce-4$f$ moment degrees of freedom and accounts for the unusual non-Fermi liquid behavior. |
| title | Coexistence of local magnetism and superconductivity in the heavy-fermion CeRh$_2$As$_2$ revealed by $μ$SR studies |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2406.16575 |