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arXiv 2604.02481cond-mat.str-elcond-mat.supr-con
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CeCoIn5中的超导性和分数化磁激发

Superconductivity and fractionalized magnetic excitations in CeCoIn5

Oak Ridge National Laboratory(橡树岭国家实验室);The University of Tennessee, Knoxville(田纳西大学诺克斯维尔分校);Harvard University(哈佛大学);Max Planck Institute for Solid State Research(马克斯·普朗克固体研究所);Neutron Scattering Division, Oak Ridge National Laboratory(橡树岭国家实验室中子散射部);Department of Physics, Brookhaven National Laboratory(布鲁海文国家实验室物理系);University of Edinburgh(爱丁堡大学);Center for Computational Quantum Physics, Flatiron Institute(平顿研究所计算量子物理中心);Quantum Condensed Matter Division and Shull-Wollan Center, Oak Ridge National Laboratory(橡树岭国家实验室量子凝聚态物质部和舒尔-沃兰中心)
Pyeongjae Park, Shang-Shun Zhang, Pietro M. Bonetti, Andrey A. Podlesnyak, Daniel M. Pajerowski, Matthew B. Stone, C. Petrovic, C. Stock, Subir Sachdev, Cristia… 展开作者

Pyeongjae Park, Shang-Shun Zhang, Pietro M. Bonetti, Andrey A. Podlesnyak, Daniel M. Pajerowski, Matthew B. Stone, C. Petrovic, C. Stock, Subir Sachdev, Cristian D. Batista, Andrew D. Christianson

AI总结:

研究揭示CeCoIn5正常态接近非常规量子临界点,通过中子散射实验发现分数化磁激发与d波超导配对的关联,提出统一原理解释强关联金属中的自旋分数化与非常规超导性。

摘要:

近期对CeCoIn5——一种典型的d波超导体——的实验表明,其正常态接近非常规量子临界点(QCP)。一个引人入胜的假设是量子临界波动促进局域化的4f时刻分裂为费米子自旋子。这种分数化费米液体(FL*)场景为非常规QCP和超导性提供了一个全面的框架,并能解释CeCoIn5正常态中相对于Luttinger计数缺失的费米面体积。为检验这一可能性,我们进行了跨超导转变的非弹性中子散射(INS)测量及相应的理论分析。我们的高精度光谱揭示了自旋共振的动量和温度依赖性,并在正常态下持续存在结构化的自旋激发连续体,对d波超导体配对的物理图景施加了严格限制。我们展示了一个结合接近FL*物理和d波配对的Kondo晶格框架能够再现数据的关键特征。该模型表明,临界温度以上f-时刻的近局域化性质和临界温度以下的共振都源于共同的规范动力学,暗示了一个联系强关联金属中自旋分数化与非常规超导性的统一组织原则。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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