Entropy Entropy Phase Competitions behind the Giant Magnetic Entropy Variation: Gd5Si2Ge2 and Tb5Si2Ge2 Case Studies Lúcia Pires Ana Horta Belo João Lima Lopes Armandina Maria Gomes Isabel T. Morellón Luis Universidad de Zaragoza Magen Cesar Universidad de Zaragoza Algarabel Pedro Antonio Ibarra Manuel Ricardo Pereira André Miguel Araújo João Pedro 2014 research-article