Universität zu Köln

Sundermann, M., Amorese, A., Strigari, F., Leedahl, B., Tjeng, L. H., Haverkort, M. W., Gretarsson, H., Yavas, H., Sala, M. Moretti, Bauer, E. D., Rosa, P. F. S., Thompson, J. D. and Severing, A. (2019). Orientation of the ground-state orbital in CeCoIn5 and CeRhIn5. Phys. Rev. B, 99 (23). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

We present core level nonresonant inelastic x-ray scattering (NIXS) data of the heavy-fermion compounds CeCoIn5 and CeRhIn5 measured at the Ce N-4,N-5 edges. The higher than dipole transitions in NIXS allow determining the orientation of the Gamma(7) crystal-field ground-state orbital within the unit cell. The crystal-field parameters of the CeMIn5 compounds and related substitution phase diagrams have been investigated in great detail in the past; however, whether the ground-state wave function is the Gamma(+)(7) ((x2) - y(2)) or Gamma(-)(7) (xy orientation) remained undetermined. We show that the Gamma(-)(7) doublet with lobes along the (110) direction forms the ground state in CeCoIn5 and CeRhIn5. For CeCoIn5, however, we find also some contribution of the first excited state crystal-field state in the ground state due to the stronger hybridization of 4 f and conduction electrons, suggesting a smaller alpha(2) value than originally anticipated from x-ray absorption. A comparison is made to the results of existing density functional theory plus dynamical mean-field theory calculations.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Sundermann, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Amorese, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Strigari, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Leedahl, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tjeng, L. H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Haverkort, M. W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gretarsson, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Yavas, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sala, M. Moretti UNSPECIFIED UNSPECIFIED UNSPECIFIED Bauer, E. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rosa, P. F. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Thompson, J. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Severing, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-137528
DOI:	10.1103/PhysRevB.99.235143
Journal or Publication Title:	Phys. Rev. B
Volume:	99
Number:	23
Date:	2019
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HEAVY; TRANSITION Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/13752