Magnetic properties and magnetocaloric effect of (Mn1−xFex)5Sn3 (x = 0–0.5) compounds

Abstract

The structural and magnetic properties of (Mn1−xFex)5Sn3 compounds have been investigated by x-ray diffraction and magnetic measurements. All the samples crystallize in the hexagonal Ni2In-type structure (P63/mmc) with the lattice parameters and cell volume decreasing almost linearly with the increase of Fe concentration. Besides the spin-glass state transition, the thermomagnetic curves show two other successive magnetic ordering transitions and their temperatures vary with x and show minima when x ∼ 0.2. With increasing Fe content, the difference between the two magnetic ordering temperatures becomes larger gradually from ∼12 K (x = 0) to ∼42 K (x = 0.5) and the magnetization at 5 K increases continuously. The −ΔSM(T) dependence for x = 0.45 exhibits two peaks, leading to a wide temperature range for magnetic refrigeration and thus a considerable magnetic refrigerant capacity (120 J/kg, ΔH = 5 T).

Patterning technology for solution-processed organic crystal field-effect transistors

“…Most organic crystal FETs reported in the literature, even when a layer is inserted to enhance charge injection, suffer from serious influences of the contact effect, appearing as the superlinear behavior in output characteristics at the low-drain-voltage region. Large contact resistance can also consume additional power because of Joule heating [190]. …”