Competing magnetic orders in the superconducting state of heavy-fermion CeRhIn5 [Physics]
![Competing magnetic orders in the superconducting state of heavy-fermion CeRhIn5 [Physics]](/image/eyJ1cmkiOiJodHRwOi8vd3d3LnBuYXMub3JnL2NvbnRlbnQvZWFybHkvMjAxNy8wNS8wOC8xNzAzMDE2MTE0L0YxLm1lZGl1bS5naWYiLCJmb3JtYXQiOiJ3ZWJwIiwicXVhbGl0eSI6MTAwLCJub0NhY2hlIjp0cnVlfQ==.webp)
Applied pressure drives the heavy-fermion antiferromagnet CeRhIn5 toward a quantum critical point that becomes hidden by a dome of unconventional superconductivity. Magnetic fields suppress
this superconducting dome, unveiling the quantum phase transition of local character. Here, we show that
5% magnetic substitution at the Ce site in CeRhIn5, either by Nd or Gd, induces a zero-field magnetic instability inside the superconducting state. This magnetic state not
only should have a different ordering vector than the high-field local-moment magnetic state, but it also competes with the
latter, suggesting that a spin-density-wave phase is stabilized in zero field by Nd and Gd impurities, similarly to the case
of Ce0.95Nd0.05CoIn5. Supported by model calculations, we attribute this spin-density wave instability to a magnetic-impurity-driven condensation
of the spin excitons that form inside the unconventional superconducting state.
Publisher URL: http://feedproxy.google.com/~r/Pnas-RssFeedOfEarlyEditionArticles/~3/YogeD-V23oo/1703016114.short
DOI: 10.1073/pnas.1703016114
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