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Direct observation of how the heavy-fermion state develops in CeCoIn5
Chen, QY; Xu, DF; Niu, XH; Jiang, J; Peng, R; Xu, HC; Wen, CHP; Ding, ZF; Huang, K; Shu, L; Zhang, YJ; Lee, H; Strocov, VN; Shi, M; Bisti, F; Schmitt, T; Huang, YB; Dudin, P; Lai, XC; Kirchner, S; Yuan, HQ; Feng, DL
Source PublicationPHYSICAL REVIEW B
AbstractHeavy-fermion systems share some of the strange metal phenomenology seen in other unconventional superconductors, providing a unique opportunity to set strange metals in a broader context. Central to understanding heavy-fermion systems is the interplay of localization and itinerancy. These materials acquire high electronic masses and a concomitant Fermi volume increase as the f electrons delocalize at low temperatures. However, despite thewide-spread acceptance of this view, a direct microscopic verification has been lacking. Here we report high-resolution angle-resolved photoemission measurements on CeCoIn5, a prototypical heavy-fermion compound, which spectroscopically resolve the development of band hybridization and the Fermi surface expansion over a wide temperature region. Unexpectedly, the localized-to-itinerant transition occurs at surprisingly high temperatures, yet f electrons are still largely localized even at the lowest temperature. These findings point to an unanticipated role played by crystal-field excitations in the strange metal behavior of CeCoIn5. Our results offer a comprehensive experimental picture of the heavy-fermion formation, setting the stage for understanding the emergent properties, including unconventional superconductivity, in this and related materials.
KeywordPseudogap Critical-point Quantum-critical-point Kondo-lattice Superconductor Surface Resistivity Transition Ybrh2si2 Systems Metals
Indexed BySCI
WOS IDWOS:000405027800007
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Chen, QY,Xu, DF,Niu, XH,et al. Direct observation of how the heavy-fermion state develops in CeCoIn5[J]. PHYSICAL REVIEW B,2017,96(4):-.
APA Chen, QY.,Xu, DF.,Niu, XH.,Jiang, J.,Peng, R.,...&Feng, DL.(2017).Direct observation of how the heavy-fermion state develops in CeCoIn5.PHYSICAL REVIEW B,96(4),-.
MLA Chen, QY,et al."Direct observation of how the heavy-fermion state develops in CeCoIn5".PHYSICAL REVIEW B 96.4(2017):-.
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