Optical study of superconducting Pr2CuOx with x ≃ 4
Optical study of superconducting Pr2CuOx with x ≃ 4
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DOI：
10.1103/physrevb.90.024503
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发表时间：
2014-07-08
影响因子：
3.7
通讯作者：
Pronin, A. V.
中科院分区：
文献类型：
--
作者：
Chanda, G.;Lobo, R. P. S. M.;Pronin, A. V.
用各种光学方法在宽的频率（7- 55000 cm ~（-1））和温度（2-300 K）范围内研究了T_c = 27 K的T'结构Pr_2Cu_x（x = 4（PCO））超导薄膜。光谱没有显示任何正常状态的间隙形成的迹象。在150 K以下，一个以零频率为中心的类Drude峰主导了电导率。在更高的温度下，它转移到有限的频率。低频电导率的详细分析表明，德鲁德峰和远红外（FIR）峰集中在约300厘米（-1）持续在所有温度。发现随着温度的升高，FIR峰的光谱权重以牺牲Drude光谱权重为代价而增长。穿透深度的温度依赖性遵循d波超导体的典型行为。零温穿透深度的绝对值为1.6 μ m，表明超导冷凝物的密度相当低。
Superconducting Pr2CuOx, x similar or equal to 4 (PCO), films with T' structure and a T-c of 27 K have been investigated by various optical methods in a wide frequency (7-55 000 cm(-1)) and temperature (2-300 K) range. The optical spectra do not reveal any indication of a normal-state gap formation. A Drude-like peak centered at zero frequency dominates the optical conductivity below 150 K. At higher temperatures, it shifts to finite frequencies. The detailed analysis of the low-frequency conductivity reveals that the Drude peak and a far-infrared (FIR) peak centered at about 300 cm(-1) persist at all temperatures. The FIR-peak spectral weight is found to grow at the expense of the Drude spectral weight with increasing temperature. The temperature dependence of the penetration depth follows a behavior typical for d-wave superconductors. The absolute value of the penetration depth for zero temperature is 1.6 mu m, indicating a rather low density of the superconducting condensate.