Campbell penetration depth in a single crystal of heavy fermion superconductor CeCoIn$_5$
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
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2026
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| _version_ | 1866917446771802112 |
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| author | Kim, Hyunsoo Tanatar, Makariy A. Petrovic, Cedomir Prozorov, Ruslan |
| author_facet | Kim, Hyunsoo Tanatar, Makariy A. Petrovic, Cedomir Prozorov, Ruslan |
| contents | The temperature and magnetic field dependent magnetic penetration depth, $λ_m(T,H)$, was measured in a single crystal of a heavy fermion superconductor CeCoIn$_5$ using a frequency-domain tunnel diode resonator. In addition to the London penetration depth, which yields the superfluid density, measurements in a finite DC magnetic field provide Campbell penetration depth, $λ_C(T,H)$, which is directly linked to the true (unrelaxed) critical current density, $J_c$. The measured $λ_C(H)$ in CeCoIn$_5$ deviates significantly from the conventional $\sim \sqrt{H}$ behavior, and its slope changes abruptly at the characteristic magnetic field values. Considering that our sample is in the clean limit, we interpret this deviation as a fingerprint of the vortex lattice symmetry change. The temperature dependence $J_c(T)$ of CeCoIn$_5$ calculated from $λ_C(T)$ is nearly $T$-linear over the entire temperature range, also in stark contrast to expectations in a conventional type-II superconductor. Our results provide new evidence for unconventional superconductivity in CeCoIn$_5$ from the never-before-measured Campbell penetration depth. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_23657 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Campbell penetration depth in a single crystal of heavy fermion superconductor CeCoIn$_5$ Kim, Hyunsoo Tanatar, Makariy A. Petrovic, Cedomir Prozorov, Ruslan Superconductivity The temperature and magnetic field dependent magnetic penetration depth, $λ_m(T,H)$, was measured in a single crystal of a heavy fermion superconductor CeCoIn$_5$ using a frequency-domain tunnel diode resonator. In addition to the London penetration depth, which yields the superfluid density, measurements in a finite DC magnetic field provide Campbell penetration depth, $λ_C(T,H)$, which is directly linked to the true (unrelaxed) critical current density, $J_c$. The measured $λ_C(H)$ in CeCoIn$_5$ deviates significantly from the conventional $\sim \sqrt{H}$ behavior, and its slope changes abruptly at the characteristic magnetic field values. Considering that our sample is in the clean limit, we interpret this deviation as a fingerprint of the vortex lattice symmetry change. The temperature dependence $J_c(T)$ of CeCoIn$_5$ calculated from $λ_C(T)$ is nearly $T$-linear over the entire temperature range, also in stark contrast to expectations in a conventional type-II superconductor. Our results provide new evidence for unconventional superconductivity in CeCoIn$_5$ from the never-before-measured Campbell penetration depth. |
| title | Campbell penetration depth in a single crystal of heavy fermion superconductor CeCoIn$_5$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2604.23657 |