Structural, magnetic properties, critical behaviors and magnetic entropy changes of La0.7-xGdxCa0.3MnO3 (x = 0,0.05,0.1) manganites
Min Zhou(周敏)1,2, Xiang Jin(金香)1,2, Wen-Xing Wang(王文星)1,3, Lin Zheng(郑琳)1,2, Ru Xing(邢茹)1,2, Yi Lu(鲁毅)1,2, and Jian-Jun Zhao(赵建军)1,2,†
1 School of Physical Science and Technology, Baotou Teachers'College, Baotou 014030, China; 2 Key Laboratory of Magnetism and Magnetic Materials at Universities of Inner Mongolia Autonomous Region, Baotou Teachers'College, Baotou 014030, China; 3 School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
Abstract Structural, magnetic properties, critical behaviors and magnetic entropy changes of La$_{0.7-x}$Gd$_{x}$Ca$_{0.3}$MnO$_{3}$ ($x=0, 0.05, 0.1$) polycrystalline manganites have been investigated. The x-ray diffraction characterization shows that all the samples can be well indexed on an orthorhombic structure with $Pnma$ space group. Magnetic measurements show that polycrystalline samples sequentially display the characteristics of cluster spin glass states, ferromagnetic states, ferromagnetic paramagnetic coexistence states and pure paramagnetic states with increasing temperature. The Curie temperature ($T_{\rm c}$) increases with increasing the doping concentration $x$, and the ferromagnetic to paramagnetic phase transition is a second-order phase transition near $T_{\rm c}$. Critical behaviors have been studied through the modified Arrott plots and the Kouvel-Fisher method. The critical exponents of polycrystalline samples are determined to be close to the critical exponents of the tricritical mean field model ($x=0$), 3D Ising model ($x=0.05$) and 3D Heisenberg model ($x=0.1$), indicating that their ferromagnetic coupling may be the result of the short-range interactions between spins in this system. The maximum magnetic entropy changes reach values of 3.99~J/(kg$\cdot $K), 2.81~J/(kg$\cdot $K), and 4.20~J/(kg$\cdot $K) at the magnetic field of 7~T, and the relative cooling power (RCP) values of La$_{0.7-x}$Gd$_{x}$Ca$_{0.3}$MnO$_{3}$ ($x=0, 0.05, 0.1$) are 478.8~J/kg, 431.1~J/kg, and 536.98~J/kg respectively.
Fund: Project supported by the State Key Development Program for Basic Research of China (Grant Nos. 11164019, 51562032, and 61565013), the Inner Mongolia Natural Science Foundation (Grant No. 2015MS0109), and the Research Program of Sciences at the Universities of Inner Mongolia Autonomous Region of China (Grant Nos. NJZZ11166, NJZY 16237, and NJZY 12202).
Min Zhou(周敏), Xiang Jin(金香), Wen-Xing Wang(王文星), Lin Zheng(郑琳),Ru Xing(邢茹), Yi Lu(鲁毅), and Jian-Jun Zhao(赵建军) Structural, magnetic properties, critical behaviors and magnetic entropy changes of La0.7-xGdxCa0.3MnO3 (x = 0,0.05,0.1) manganites 2022 Chin. Phys. B 31 066102
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