Non-$d$-wave Behavior Observed in Low-Temperature Specific Heat of Pr1.85Ce0.15CuO4.065
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概要
- 論文の詳細を見る
Recently, possible evidence from the low-temperature specific heat (LTSH) for the lines of nodes in the superconducting order parameter of cuprate superconductors has attracted considerable attention and is still a controversial issue. To clarify this issue, N-type Pr1.85Ce0.15CuO4+δ samples have been prepared under different annealing conditions and investigated by means of X-ray diffraction and oxygen content analyses, and magnetic-susceptibility and low-temperature specific heat (LTSH) measurements. The values of oxygen content parameter $\delta$ for Pr1.85Ce0.15CuO4+δ are 0.161 and 0.065 for samples annealed in an Ar atmosphere and in vacuum, respectively. Pr1.85Ce0.15CuO4.161 shows clear evidence for an $\alpha T^{2}$ term at zero magnetic field in LTSH measurements, which is consistent with $d$-wave superconductivity. However, this behavior is not observed in Pr1.85Ce0.15CuO4.065. These results indicate that different heat treatments may change the oxygen content of Pr1.85Ce0.15CuO4+δ, resulting in the different behaviors observed in LTSH measurements. We also discuss the results of the LTSH measurements in La2-xSrxCuO4 ($x=0.1$, 0.16 and 0.22) to explain these behaviors observed in the LTSH data of Pr1.85Ce0.15CuO4+δ.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2005-03-15
著者
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Huang Chien-jung
Department Of Applied Physics National University Of Kaohsiung
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Meen Teen-hang
Department Of Electrical Engineering Southern Taiwan University Of Technology
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Chen Wen-ray
Department Of Electronic Engineering National Formosa University
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Li Tsz-tai
Department Of Electrical Engineering Southern Taiwan University Of Technology
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Li Jiun-wei
Department Of Electrical Engineering Southern Taiwan University Of Technology
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Shu Mou-shin
Department Of Electrical Engineering Southern Taiwan University Of Technology
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Meen Teen-Hang
Department of Electrical Engineering, Southern Taiwan University of Technology, Tainan 710, Taiwan, R.O.C.
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Li Jiun-Wei
Department of Electrical Engineering, Southern Taiwan University of Technology, Tainan 710, Taiwan, R.O.C.
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Chen Wen-Ray
Department of Electrical Engineering, Southern Taiwan University of Technology, Tainan 710, Taiwan, R.O.C.
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Shu Mou-Shin
Department of Electrical Engineering, Southern Taiwan University of Technology, Tainan 710, Taiwan, R.O.C.
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Li Tsz-Tai
Department of Electrical Engineering, Southern Taiwan University of Technology, Tainan 710, Taiwan, R.O.C.
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