Low field magnetocaloric effect and heat capacity of A-site ordered NdBaMn2O6 manganite

TL;DR

This study investigates the anomalous magnetocaloric effect and heat capacity of A-site ordered NdBaMn2O6 manganite, revealing unique magnetic transitions and potential applications in magnetic cooling at room temperature.

Contribution

It reports the first detailed analysis of the low-field magnetocaloric effect and heat capacity in NdBaMn2O6, highlighting anomalous behaviors and the coexistence of direct and inverse effects.

Findings

Abrupt transitions between direct and inverse MCE in low magnetic fields.

In 11 kOe magnetic field, only inverse MCE observed during heating.

MCE values are modest but near room temperature, useful for magnetic cooling.

Abstract

The magnetocaloric effect (MCE) in the A-site ordered manganite NdBaMn2O6 is studied. The MCE in this compound has an anomalous behavior. In low magnetic fields, the abrupt transitions between direct and inverse magnetocaloric effect are observed. In a relatively strong magnetic field H=11 kOe the direct and inverse effects are observed only at cooling, while the heating mode reveals only an inverse MCE. The value of the MCE (-{\Delta}S=0.7 J/kg K and {\Delta}S= 1.02 J/kg K for {\Delta}H=11 kOe) does not reach high values, but the proximity of the effects occurring at room temperatures expects the use of both effects in the magnetic cooling technology.