Abstract
The cross response of magnetic and electric fields on the ribbon CuO2 spin chain is used to investigate the multicaloric properties of linarite PbCuSO4(OH)2. The theory is built on a frustrated Heisenberg scheme. Following the magnetoelectric properties, the thermodynamic and caloric coefficients report multiple field–dependent criticalities attributed to the metamagnetoelectric effect. The isentropes of PbCuSO4(OH)2 particularly exhibit about five and six major sharper dips in magnetic and electric field sweeps respectively. This corresponds to the metamagnetoelectric transitions which in turn come along with a large temperature change in the entropy and heat capacity analyses and then increasing the cooling ability of linarite. Further analysis of the magnetocaloric as well as the electrocaloric effects shows a significant growth during the metamagnetoelectric transitions. A clear relationship is established between the magnetoelectric coupling constant, the magnetocaloric and the pyroelectric coefficients, witnessing the metamagnetoelectric transitions-driven multicaloric effect in PbCuSO4(OH)2. Obviously, the resulting total adiabatic temperature change expressed through the magnetocaloric or the pyroelectric coefficient depends on the sign of the magnetoelectric coupling constant. Therefore, the occurrence of the metamagnetoelectric effect with several magnetic and electric field-dependent transitions characterized by a set of positive and negative increases in the magnetoelectric coupling provides a great advantage by increasing the possibilities of a significant multicaloric effect in the linarite PbCuSO4(OH)2 cuprate spin chain.
Published Version
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