会议论文详细信息
9th International Workshop on Processing and Applications of Superconducting (RE)BCO Large Grain Materials
Specific heat analysis of the low temperature anomalies in orthorhombic PrBa2Cu3O6+ x (x = 1; x = 0.95) compounds
物理学;材料科学
Lahoubi, M.^1
Badji-Mokhtar Annaba University, Faculty of Sciences, Department of Physics, Laboratory L.P.S., PO Box-12, Annaba
23000, Algeria^1
关键词: Antiferromagnetic orderings;    Critical temperatures;    Low temperature anomaly;    Magnetic behaviour;    Oxygen concentrations;    Specific heat analysis;    Spin-reorientation phase transition;    Sub-lattices;   
Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/695/1/012006/pdf
DOI  :  10.1088/1742-6596/695/1/012006
Subject:84.1
来源: IOP
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【 摘 要 】
The specific heat Cp(T) and entropy S(T) properties of the orthorhombic PrBa2Cu3O6+xcompounds in two states of oxygen concentration x, an over doped (OV) with x = 1 and an optimally doped (OP) with x = 0.95 are reanalyzed below the Néel temperature of the antiferromagnetic ordering of the Pr sublattice TN= 17.5 and 14 K, respectively. Two simultaneous anomalies for both states are observed. The first one occurs near the previous spin reorientation phase transition temperature T2∼ 11.5 and ∼ 9-10 K, respectively whereas the second one remains close to the so called low-critical temperature Tcr∼ 4-5 K for the OV state as it has been reported before for the OP state. By fitting the Cp(T)/T data to A{T2}-3/2+ γ + C{T2}1+ D{T1}2for T crthe four coefficients obtained with the best adjusted A-squared values are compared with previous findings. Reduced values for y are confirmed in this work. The results which are well described by the contribution of the DT5term to Cp(T) can be connected with the previous Pr-Cu(2) magnetic coupling that is sufficiently enough to cause a modest spin reorientation phase transition at T2and a critical magnetic behaviour below Tcr.
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