Superconductivity and fractionalized magnetic excitations in CeCoIn5
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arXiv
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2026
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| author | Park, Pyeongjae Zhang, Shang-Shun Bonetti, Pietro M. Podlesnyak, Andrey A. Pajerowski, Daniel M. Stone, Matthew B. Petrovic, C. Stock, C. Sachdev, Subir Batista, Cristian D. Christianson, Andrew D. |
| author_facet | Park, Pyeongjae Zhang, Shang-Shun Bonetti, Pietro M. Podlesnyak, Andrey A. Pajerowski, Daniel M. Stone, Matthew B. Petrovic, C. Stock, C. Sachdev, Subir Batista, Cristian D. Christianson, Andrew D. |
| contents | Recent experiments on CeCoIn5 -- a prototypical d-wave superconductor -- indicate that its normal state lies near an unconventional quantum critical point (QCP). One intriguing hypothesis is that quantum-critical fluctuations promote fractionalization of localized 4f moments into fermionic spinons. This fractionalized Fermi liquid (FL*) scenario provides a comprehensive framework for the unconventional QCP and superconductivity, and can reconcile a "missing" Fermi-surface volume relative to the Luttinger count in the normal state of CeCoIn5. To test this possibility, we performed inelastic neutron scattering (INS) measurements on CeCoIn5 across the superconducting transition and corresponding theoretical analysis. Our high-precision spectra reveal detailed momentum and temperature dependence of the spin resonance and a structured spin excitation continuum persisting even in the normal state, placing stringent constraints on the physical picture of pairing in a d-wave superconductor. We show that a Kondo-lattice framework incorporating proximity to FL* physics and d-wave pairing reproduces key features of the data. The model suggests that both the quasi-localized nature of the f-moments above Tc and the resonance below Tc arise from common underlying gauge dynamics, implying a unifying organizing principle linking spin fractionalization and unconventional superconductivity in strongly correlated metals. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_02481 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Superconductivity and fractionalized magnetic excitations in CeCoIn5 Park, Pyeongjae Zhang, Shang-Shun Bonetti, Pietro M. Podlesnyak, Andrey A. Pajerowski, Daniel M. Stone, Matthew B. Petrovic, C. Stock, C. Sachdev, Subir Batista, Cristian D. Christianson, Andrew D. Strongly Correlated Electrons Superconductivity Recent experiments on CeCoIn5 -- a prototypical d-wave superconductor -- indicate that its normal state lies near an unconventional quantum critical point (QCP). One intriguing hypothesis is that quantum-critical fluctuations promote fractionalization of localized 4f moments into fermionic spinons. This fractionalized Fermi liquid (FL*) scenario provides a comprehensive framework for the unconventional QCP and superconductivity, and can reconcile a "missing" Fermi-surface volume relative to the Luttinger count in the normal state of CeCoIn5. To test this possibility, we performed inelastic neutron scattering (INS) measurements on CeCoIn5 across the superconducting transition and corresponding theoretical analysis. Our high-precision spectra reveal detailed momentum and temperature dependence of the spin resonance and a structured spin excitation continuum persisting even in the normal state, placing stringent constraints on the physical picture of pairing in a d-wave superconductor. We show that a Kondo-lattice framework incorporating proximity to FL* physics and d-wave pairing reproduces key features of the data. The model suggests that both the quasi-localized nature of the f-moments above Tc and the resonance below Tc arise from common underlying gauge dynamics, implying a unifying organizing principle linking spin fractionalization and unconventional superconductivity in strongly correlated metals. |
| title | Superconductivity and fractionalized magnetic excitations in CeCoIn5 |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2604.02481 |