Metamagnetic effects in epitaxial BaFe1.8Cr0.2As2 thin films

• Published in: The European physical journal. B, Condensed matter physics Vol. 85; no. 12
• Main Authors: Engelmann, J., Müller, K.H., Nenkov, K., Schultz, L., Holzapfel, B., Haindl, S.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01.12.2012; EDP Sciences
• Subjects: Complex Systems; Condensed Matter Physics; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Fluid- and Aerodynamics; Magnetic properties and materials; Magnetic properties of monolayers and thin films; Magnetic properties of surface, thin films and multilayers; Physics; Physics and Astronomy; Regular Article; Solid State Physics; Solid State and Materials; Barium Iron Chromium Arsenides Mixed; Epitaxial layers; Magnetization; Tetragonal lattices; Phase transformations; Magnetic hysteresis; Pulsed laser deposition; High temperature; Magnetic transitions; Thin films; Metamagnetism; Monocrystals; Orthorhombic lattices; Paramagnetic-antiferromagnetic transitions
• ISSN: 1434-6028; 1434-6036
• DOI: 10.1140/epjb/e2012-30919-x

Epitaxial BaFe 1.8 Cr 0.2 As 2 thin films with the tetragonal c - axis perpendicular to the thin film surface were grown on (LaAlO 3 ) 0.3 (Sr 2 AlTaO 6 ) 0.7 (LSAT) single crystalline substrates using pulsed laser deposition (PLD). Resistive measurements indicate the existence of two transitions at temperatures of about 80 K and 40 K. The transition at 80 K is attributed to the structural transition from the high temperature tetragonal phase to the low temperature orthorhombic phase accompanied with the magnetic transition from a paramagnetic to an antiferromagnetic state as known for doped bulk systems. Below T  ≈ 40 K the magnetization curves measured perpendicularly to the orthorhombic c - axis in fields up to 9 Tesla show two inflexion points indicating metamagnetic transitions.