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Tracing the localization of 4f electrons: Angle-resolved photoemission on YbCo2Si2, the stable trivalent counterpart of the heavy-fermion YbRh2Si2

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons126640

Hannaske,  A.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons126614

Geibel,  C.
Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Zitation

Güttler, M., Kummer, K., Patil, S., Höppner, M., Hannaske, A., Danzenbächer, S., et al. (2014). Tracing the localization of 4f electrons: Angle-resolved photoemission on YbCo2Si2, the stable trivalent counterpart of the heavy-fermion YbRh2Si2. Physical Review B, 90(19): 195138, pp. 1-5. doi:10.1103/PhysRevB.90.195138.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0024-9C49-6
Zusammenfassung
YbCo2Si2 is considered to serve as a stable-valent, isoelectronic reference for the extensively studied heavy-fermion system YbRh2Si2 which is situated very close to an antiferromagnetic quantum critical point (QCP). The investigation of the Fermi surface (FS) topology of YbCo2Si2 and its comparison to YbRh2Si2 could help to unravel the strongly disputed nature of this quantum phase transition, whether it originates from a "local" or "itinerant" QCP. Here we study the electronic structure and FS of YbCo2Si2 by means of angle-resolved photoelectron spectroscopy (ARPES) and compare it to ab initio band structure calculations and FS modeling. Our approach allows the electronic structure at the surface and in the bulk to be disentangled. Identifying the bulk contribution, we demonstrate that YbCo2Si2 exhibits a "small" FS, confirming the formation of a "large" FS in YbRh2Si2. This favors an itinerant QCP, instead of the widely discussed local scenario. Our study demonstrates that ARPES is a reliable tool for the study of bulk electronic states in intermetallic Kondo lattice systems despite the complexity induced by their three-dimensional character and the presence of pronounced surface states.