Laboratoire des Solides Irradiés, CNRS UMR 7642 & CEA-DSM-IRAMIS, Ecole Polytechnique, Palaiseau, France.
Phys Rev Lett. 2010 Dec 31;105(26):267002. doi: 10.1103/PhysRevLett.105.267002. Epub 2010 Dec 22.
Charge doping of iron-pnictide superconductors leads to collective pinning of flux vortices, whereas isovalent doping does not. Moreover, flux pinning in the charge-doped compounds is consistently described by the mean-free path fluctuations introduced by the dopant atoms, allowing for the extraction of the elastic quasiparticle scattering rate. The absence of scattering by dopant atoms in isovalently doped BaFe2(As(1-x)P(x))(2) is consistent with the observation of a linear temperature dependence of the low-temperature penetration depth in this material.
电荷掺杂铁基超导体导致磁通涡旋的集体钉扎，而等价掺杂则不会。此外，电荷掺杂化合物中的磁通钉扎始终可以用掺杂原子引入的平均自由程波动来描述，从而可以提取出弹性准粒子散射率。在等价掺杂 BaFe2(As(1-x)P(x))(2)中，没有观察到掺杂原子的散射，这与该材料在低温下穿透深度随温度线性变化的观察结果一致。
