Protected Vacuum Annealing Effect on Single Crystals of Pr1-x LaCe x CuO4 in the Overdoped Regime

3rd International Conference on Functional Materials Science 2016

Baqiya, M.A.^1 ; Triono, B.^1 ; Darminto^1 ; Adachi, T.^2 ; Takahashi, A.^3 ; Konno, T.^3 ; Watanabe, M.^3 ; Prombood, T.^3 ; Koike, Y.^3

Department of Physics, Institut Teknologi Sepuluh Nopember (ITS), ITS Campus, Sukolilo, Surabaya

60111, Indonesia^1

Department of Engineering and Applied Sciences, Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo

102-8554, Japan^2

Department of Applied Physics, Graduate School of Engineering, Tohoku University, 6-6-05 Aoba, Aramaki, Aoba-ku, Sendai

980-8579, Japan^3

关键词: Curie weiss likes;    Magnetic susceptibility measurements;    Overdoped regime;    Powder X ray diffraction;    Temperature dependence;    Travelling solvent floating zones;    Two-step annealing;    Vacuum-annealing;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/196/1/012011/pdf
DOI  :  10.1088/1757-899X/196/1/012011

来源: IOP

【 摘 要 】

We report the effect of protected vacuum annealing on the superconducting (SC) and magnetic properties of Pr1-xLaCexCuO4(PLCCO) single crystals in the overdoped regime (x = 0.13 - 0.20). The powders and single crystals of PLCCO with all x were synthesized by the solid state reaction and grown by the travelling solvent floating zone (TSFZ) method, respectively. The powder x-ray diffraction (XRD) results analyzed by the Rietveld method have shown that there is a systematic decrease in the c-axis length with increasing x, suggesting the proper substitution of Ce for Pr in overdoped PLCCO up to x = 0.20. The so-called two-step annealing performed in the overdoped regime was essential for increasing the SC volume fraction estimated from the magnetic susceptibility measurements. Furthermore, the temperature dependence of the normal-state magnetic susceptibility for reduced crystals of PLCCO with all x has exhibited a Curie-Weiss-like behavior regardless of various steps of the protected vacuum annealing process.