高温La1.83Sr0.17CuO4超导体中两个能隙的实验证据。
Experimental evidence for two gaps in the high-temperature La1.83Sr0.17CuO4 superconductor.
作者信息
Khasanov R, Shengelaya A, Maisuradze A, Mattina F La, Bussmann-Holder A, Keller H, Müller K A
机构信息
Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.
出版信息
Phys Rev Lett. 2007 Feb 2;98(5):057007. doi: 10.1103/PhysRevLett.98.057007.
The in-plane magnetic field penetration depth (lambda(ab)) in single-crystal La1.83Sr0.17CuO4 was investigated by muon-spin rotation (muSR). The temperature dependence of lambda(ab)(-2) has an inflection point around 10-15 K, suggesting the presence of two superconducting gaps: a large gap (Delta(1)(d)) with d-wave and a small gap (Delta(2)(s)) with s-wave symmetry. The zero-temperature values of the gaps at mu(0)H=0.02 T were found to be Delta(1)(d)(0)=8.2(1) meV and Delta(2)(s)(0)=1.57(8) meV.
通过μ子自旋旋转（μSR）研究了单晶La1.83Sr0.17CuO4中的面内磁场穿透深度（λ(ab)）。λ(ab)^(-2)的温度依赖性在10 - 15K左右有一个拐点，这表明存在两个超导能隙：一个具有d波对称性的大能隙（Δ(1)(d)）和一个具有s波对称性的小能隙（Δ(2)(s)）。在μ(0)H = 0.02 T时，能隙的零温度值分别为Δ(1)(d)(0)=8.2(1) meV和Δ(2)(s)(0)=1.57(8) meV。
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