Direct and Inverse Magnetocaloric effects in A-site ordered PrBaMn2O6 manganite in low magnetic fields

TL;DR

This study investigates the magnetocaloric effect in PrBaMn2O6 manganite, revealing both direct and inverse effects at magnetic transition points, with differences observed between direct and indirect measurement methods.

Contribution

It provides new direct measurement data of the magnetocaloric effect in PrBaMn2O6 using novel and classic techniques, highlighting the behavior at magnetic phase transitions.

Findings

Direct and inverse MCE observed at Curie and Neel points.

Inverse MCE is less in heating than cooling, indicating magnetic competition.

Significant differences between direct and indirect MCE estimates around the AF transition.

Abstract

The magnetocaloric effect (MCE) of A-site ordered PrBaMn2O6 manganite has been studied by direct methods and by the specific heat measurements. Direct measurements of the MCE in low magnetic fields were performed using recently proposed modulation technique and by classic direct method in high fields. Direct and inverse MCE are observed at Curie and Neel points correspondingly. A value of the inverse MCE in the heating run is less than in the cooling regime. This effect can be attributing to competition between ferromagnetic and antiferromagnetic interactions. Indirectly estimated and direct MCE values considerably differ in around first order AF transition.