Magnetic susceptibility and electron magnetic resonance study of monovalent potassium doped manganites Pr0.6Sr0.4−xKxMnO3

Abstract

• Orthorhombic monovalent doped manganites Pr0.6Sr0.4-xKxMnO3 (x = 0.05 to 0.2). • Unit cell volume decreases with K content. • Curie temperature decreases with K content. • Electron magnetic resonance determines low temperature limit of paramagnetic phase. The monovalent potassium doped manganites Pr 0.6 Sr 0.4− x K x MnO 3 ( x = 0.05–0.2) are characterized using the complementary magnetic susceptibility and electron resonance methods. In paramagnetic phase the temperature variations of the inverse magnetic susceptibility and the inverse intensity of resonance signal obey the Curie–Weiss law. A similarity in temperature variation of resonance signal width and the adiabatic polaron conductivity points to the polaron mechanism controlling the resonance linewidth. The low temperature limit of the pure paramagnetic phase is determined from the electron resonance spectra revealing the mixed phase spread down to the Curie temperature.