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Magnetic anisotropy and ferromagnetic correlations above the Curie temperature in Eu2CuSi3 single crystals

Magnetization M(T,B), specific heat cp(T), and electrical resistivity ρ(T,B) show ferromagnetic ordering in Eu2CuSi3 single crystals below the Curie temperature TC=34 K. Temperature T and magnetic field B-dependent M(T,B) data give evidence for a sizable magnetic anisotropy in the AlB2-derived hexag...

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Bibliographic Details
Main Authors: Cao, Chongde (Author) , Klingeler, Rüdiger (Author) , Vinzelberg, H. (Author) , Leps, Norman Uwe (Author) , Löser, W. (Author) , Behr, G. (Author) , Muranyi, F. (Author) , Kataev, V. (Author) , Büchner, B. (Author)
Format: Article (Journal)
Language:English
Published: 27 October 2010
In: Physical review. B, Condensed matter and materials physics
Year: 2010, Volume: 82, Issue: 13, Pages: 1-7
ISSN:1550-235X
DOI:10.1103/PhysRevB.82.134446
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevB.82.134446
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.82.134446
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Author Notes:C.D. Cao, R. Klingeler, H. Vinzelberg, N. Leps, W. Löser, G. Behr, F. Muranyi, V. Kataev, and B. Büchner
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Summary:Magnetization M(T,B), specific heat cp(T), and electrical resistivity ρ(T,B) show ferromagnetic ordering in Eu2CuSi3 single crystals below the Curie temperature TC=34 K. Temperature T and magnetic field B-dependent M(T,B) data give evidence for a sizable magnetic anisotropy in the AlB2-derived hexagonal structure at T<TC. The increase in |dM/dT| at TC for B=50 mT along the easy magnetic c axis (⟨001⟩) is more than twice as large as for B along the a axis (⟨010⟩). The analysis of cp(T) in the magnetically ordered phase reveals signatures of a spin-reorientation process at T≈10 K below which the magnetic anisotropy in M(T,B) almost vanishes. Measurements of electron-spin resonance (ESR) on Eu2+ ions reveal the anisotropy of the resonance field and the additional narrowing of the ESR signal at T<100 K that prove appreciable short-range ferromagnetic correlations far above TC. These lead to a large negative magnetoresistance observed in the ρ(T,B) measurements even up to a temperature T≈100 K. Below 50 K the ESR line starts to split due to the emergence of two magnetically nonequivalent Eu sites. The onset of magnetic order is manifested in the ESR spectrum by nucleation of a third line. Below T≈10 K, where thermodynamic data suggest a transformation of the ordered spins to a state with strongly reduced anisotropy, the ESR spectrum evolves into a featureless broad asymmetric peak.
Item Description:Im Titel sind die Zahlen 2 und 3 tiefgestellt
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Physical Description:Online Resource
ISSN:1550-235X
DOI:10.1103/PhysRevB.82.134446

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