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首页> 外文期刊>Japanese Journal of Applied Physics. Part 1, Regular Papers, Brief Communications & Review Papers >Heat Treatment Effect on Superconductivity and Specific Heat of Pr_(1.85)Ce_(0.15)CuO_(4+δ)
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Heat Treatment Effect on Superconductivity and Specific Heat of Pr_(1.85)Ce_(0.15)CuO_(4+δ)

机译：热处理对Pr_（1.85）Ce_（0.15）CuO_（4 +δ）超导和比热的影响

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摘要

Polycrystalline samples of electron-doped Pr_(1.85)Ce_(0.15)CuO_(4+δ) have been prepared under different annealing conditions and investigated by X-ray diffraction analysis, oxygen content analysis, electrical resistivity, magnetic susceptibility and low-temperature specific heat measurements. X-ray-diffraction patterns show that the samples contain a single T′ phase. The superconducting transition temperatures T_(cm) taken with the onset of diamagnetism in magnetic-susceptibility measurements are 20 and 19.5 K for the samples annealed in flowing Ar gas and in vacuum (～10~(-3) Torr), respectively. The data of the samples annealed in flowing Ar gas show clear evidence of αT~2 term at zero magnetic field in superconducting electronic specific heat, and are consistent with d-wave superconductivity. However, this behavior is not observed in the other sample, which is annealed in vacuum. These results indicate that different heat treatments affect the oxygen content, homogeneity, superconducting transition temperature T_c, superconducting volume fraction, and the superconducting pairing symmetry of Pr_(1.85)Ce_(0.15)CuO_(4+δ). We also discuss the results of specific heat in La_(2-x)Sr_xCuO_4 (x = 0.1, 0.16 and 0.22) to explain these behaviors observed in the specific heat of Pr_(1.85)Ce_(0.15)CuO_(4+δ).
机译：在不同的退火条件下制备了电子掺杂的Pr_（1.85）Ce_（0.15）CuO_（4 +δ）多晶样品，并通过X射线衍射分析，氧含量分析，电阻率，磁化率和低温比进行了研究。热量测量。 X射线衍射图表明样品含有单个T'相。在磁化率测量中，随着磁化作用的开始，超导转变温度T_（cm）分别为在流动的Ar气和真空（〜10〜（-3）Torr）中退火的样品的20和19.5K。在流动的Ar气中退火的样品数据清楚地证明了在超导电子比热中零磁场下αT〜2项，并且与d波超导性一致。但是，这种行为在另一个样品中进行了观察，该样品在真空中进行了退火。这些结果表明不同的热处理会影响氧含量，均匀性，超导转变温度T_c，超导体积分数和Pr_（1.85）Ce_（0.15）CuO_（4 +δ）的超导配对对称性。我们还讨论了La_（2-x）Sr_xCuO_4（x = 0.1、0.16和0.22）中的比热结果，以解释在Pr_（1.85）Ce_（0.15）CuO_（4 +δ）的比热中观察到的这些行为。

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