Journal Article

FZJ-2015-03016

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png de Haas–van Alphen effect and Fermi surface properties of single-crystal CrB $_{2}$

Brasse, M. (Corresponding Author) ; Chioncel, L. ; Kuneš, J. ; Bauer, A. ; Regnat, A. ; Blum, C. G. F. ; Wurmehl, S. ; Pfleiderer, C. ; Wilde, M. A. (Corresponding Author) ; Grundler, D.

2013
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/8582  doi:10.1103/PhysRevB.88.155138

Abstract: We report the angular dependence of three distinct de Haas–van Alphen (dHvA) frequencies of the torque magnetization in the itinerant antiferromagnet CrB2 at temperatures down to 0.3 K and magnetic fields up to 14 T. Comparison with the Fermi surface calculations considering an incommensurate cycloidal magnetic order suggests that two of the observed dHvA oscillations arise from electronlike Fermi surface sheets formed by bands with strong B-px,y character. The third orbit could correspond to a Cr-d derived Fermi surface sheet. The measured effective masses of these Fermi surface sheets display strong enhancements of a factor of about 2 over the calculated band masses which can be attributed to electron-phonon coupling and electronic correlations. Signatures of further heavy d-electron bands that are predicted by the calculations are not observed in the temperature and field range studied. In the view that the B-p bands are at the heart of conventional high-temperature superconductivity in the isostructural MgB2, we consider possible implications of our findings for nonmagnetic CrB2 and an interplay of itinerant antiferromagnetism with superconductivity.

Keyword(s): Basic research (1st) ; Others (1st) ; Information Technology and Functional Materials (1st) ; Condensed Matter Physics (2nd) ; Magnetism (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS (München) ; Jülich Centre for Neutron Science JCNS (München) ; JCNS-FRM-II)
2. Streumethoden (JCNS-2)

Research Program(s):

1. 54G - JCNS (POF2-54G24) (POF2-54G24)

Experiment(s):

1. HEiDi: Single crystal diffractometer on hot source (SR9b)
2. RESI: Thermal neutron single crystal diffractometer (SR8b)
3. SPODI: High resolution powder diffractometer (SR8a)

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Database coverage:
; ; ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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