Abassi Mounira, Mohamed Za, Dhahri J, Hlil E K
Laboratoire de Physique de la Matière Condensée et des Nanosciences, Faculté des Sciences, 5019, Université de Monastir, Tunisia.
Dalton Trans. 2016 Mar 21;45(11):4736-46. doi: 10.1039/c5dt04490a. Epub 2016 Feb 10.
An investigation of the magnetic, magnetocaloric and electrical behavior of La(0.67)Ba(0.1)Ca(0.23)MnO3 is presented. The variation of magnetization (M) vs. temperature (T) under 1, 2, 3, 4 and 5 T magnetic fields reveals a ferromagnetic-paramagnetic transition. Magnetic entropy change, relative cooling power and specific heat for magnetic field variation were conducted using a phenomenological model. Moreover, the electrical resistivity is fitted with the phenomenological percolation model which is based on the phase segregation of ferromagnetic metallic clusters and paramagnetic insulating regions. The equation of the form ΔS(P)(M)(T,H) = - α∫(H)(0)∂(ln)(ρ)/∂(T)(dH) relates the magnetic order to the transport behavior of our sample. The results show that the as obtained magnetic entropy change values are similar to those determined using data obtained from the investigation of the dependence of magnetization on the temperature and magnetic field.
本文对La(0.67)Ba(0.1)Ca(0.23)MnO3的磁性、磁热和电学行为进行了研究。在1、2、3、4和5 T磁场下，磁化强度（M）随温度（T）的变化揭示了铁磁-顺磁转变。利用唯象模型对磁场变化的磁熵变、相对制冷量和比热进行了研究。此外，电阻率采用基于铁磁金属团簇和顺磁绝缘区相分离的唯象渗流模型进行拟合。形式为ΔS(P)(M)(T,H) = - α∫(H)(0)∂(ln)(ρ)/∂(T)(dH)的方程将磁有序与我们样品的输运行为联系起来。结果表明，所获得的磁熵变值与使用从磁化强度对温度和磁场依赖性的研究中获得的数据所确定的值相似。
