Electron spin resonance study of the local environment for the Gd3+ and Eu2+ ions in Ca1-xRxB6 (R = Gd,Eu) (0.0001≤x≤0.30)

• Published in: Journal of magnetism and magnetic materials Vol. 310; no. 2; pp. 864 - 866
• Main Authors: DUQUE, J. G. S, URBANO, R. R, PAGLIUSO, P. G, RETTORI, C, SCHLOTTMANN, P, FISK, Z, OSEROFF, S. B
• Format: Conference Proceeding Journal Article
• Language: English
• Published: Amsterdam Elsevier Science 01.03.2007
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electron paramagnetic resonance and relaxation; Exact sciences and technology; Magnetic resonances and relaxations in condensed matter, mössbauer effect; Physics; 71.10.Ca; Metallic conduction; Line shape; ESR; Coexistence; CaB6; Local structure; 75.10.Lp; Weak ferromagnetism; Dysonian Line shape; Chemical composition; Electron paramagnetic resonance; 71.35.-y
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2006.10.1103

The environment of in is studied by electron spin resonance (ESR). For x0.001 the spectra show Lorentzian shape (insulating phase). As x increases, the spectra present a superposition of Lorentzian and Dysonian resonances (coexistence of insulating and metallic phases). For x0.01, the line shape becomes pure Dysonian (metallic phase). Thus, the intermediate concentration regime of Ca1-xRxB6 is intrinsically inhomogeneous. These compounds show no weak ferromagnetism.