Specific heat and magnetocaloric effect in Pr0.6Sr0.4−xAgxMnO3 manganites

• Published in: Intermetallics Vol. 102; pp. 88 - 93
• Main Authors: Szewczyk, D., Thaljaoui, R., Mucha, J., Stachowiak, P., Vanderbemden, P.
• Format: Journal Article Web Resource
• Language: English
• Published: Elsevier Ltd 01-11-2018; Elsevier
• Subjects: 64.70.-p Specific phase transitions; 65.40.-b Thermal properties of crystalline solids; 75.30.Sg Magnetocaloric effect, magnetic cooling; 75.40.Cx Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.); Electrical & electronics engineering; Engineering, computing & technology; Ingénierie électrique & électronique; Ingénierie, informatique & technologie; Magnetocaloric effect; Manganites; Materials science & engineering; Physical, chemical, mathematical & earth Sciences; Physics; Physique; Physique, chimie, mathématiques & sciences de la terre; Science des matériaux & ingénierie; Thermal properties; 64.70.-p Specific phase transitions; 75.40.Cx Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.); 75.30.Sg Magnetocaloric effect, magnetic cooling; 65.40.-b Thermal properties of crystalline solids
• ISSN: 0966-9795; 1879-0216
• DOI: 10.1016/j.intermet.2018.09.002

The detailed investigation on the specific heat in manganites of Pr0.6Sr0.4−xAgxMnO3 (x = 0.05 and x = 0.1) has been reported. The experimental conditions were: the temperature range 1.8–330 K and applied magnetic fields of 0, 1, 2 and 3 T. Specific heat results confirmed two phase transitions, a structural one at Tstr = 43 K for both samples and a paramagnetic–ferromagnetic one near TPM–FM = 288 K and 284 K for the x = 0.05 and x = 0.1 sample, respectively. For the more doped sample the magnetic field causes the shift of the PM–FM transition temperature towards higher temperatures. A thorough analysis of particular contributions to the specific heat was presented. The indirect magnetocaloric effect was deduced for the more doped sample (x = 0.1). Under an applied magnetic field of 3 T magnetic entropy changes and adiabatic temperature exhibits a maximum. The absolute ΔSmax reaches the value of 1.74 J/mol K, resulting in adiabatic cooling of ΔTad = 0.95 K. Such result confirms presented samples as promising candidates for the magnetic cooling technology at room temperature.
•Heat transport investigations towards magnetic cooling applications.•Praseodymium based manganites exhibit good magnetocaloric properties.•Applying magnetic field induces glass-like fraction.