Specific heat and magnetocaloric effect in Pr0.6Sr0.4−xAgxMnO3 manganites. (November 2018)

• Record Type: Journal Article
• Authors: Szewczyk, D.; Thaljaoui, R.; Mucha, J.; Stachowiak, P.; Vanderbemden, P.
• Is Part Of: Intermetallics. Volume 102(2018:Nov.)
• Page Start: 88
• Page End: 93
• Publication Date: 2018-11
• Subjects: 65.40.-b Thermal properties of crystalline solids -- 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; Intermetallic compounds -- Metallography -- Periodicals; Metallic glasses -- Periodicals; Composés intermétalliques -- Métallographie -- Périodiques; 669.94
• DOI: 10.1016/j.intermet.2018.09.002
• Languages: English
• ISSNs: 0966-9795

Abstract

Abstract: The detailed investigation on the specific heat in manganites of Pr0.6 Sr0.4− x Ag x MnO3 ( 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 T str = 43 K for both samples and a paramagnetic–ferromagnetic one near T PM–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 Δ S max reaches the value of 1.74 J/mol K, resulting in adiabatic cooling of Δ T ad = 0.95 K. Such result confirms presented samples as promising candidates for the magnetic cooling technology at room temperature. Highlights: Heat transport investigations towards magnetic cooling applications. Praseodymium based manganites exhibit good magnetocaloric properties. Applying magnetic field induces glass-like fraction.