论文标题
丘陵超导体中掺杂剂空间分布的非破坏性表征
Non-destructive characterisation of dopant spatial distribution in cuprate superconductors
论文作者
论文摘要
当研究超导性作为杂质和兴奋剂不均匀性时，研究样品的适当表征至关重要。我们提出了一种方法，其中极化的中子成像设置利用超导样品中有一个陷阱的场的存在的自旋偏振中子的进攻，以空间绘制超导和非驱动状态之间的相变的临界温度。我们在原型高温超导体（la，sr）$ _ 2 $ cuo $ _4 $的超导晶体上演示了这种方法。通过互补的磁化率测量来支持的结果表明，该方法能够解决跨LSCO晶体长度的过渡温度的较小变化，这是由于畸形掺杂的不均匀性引起的。
Proper characterisation of investigated samples is vital when studying superconductivity as impurities and doping inhomogeneities can affect the physical properties of the measured system. We present a method where a polarised neutron imaging setup utilises the precession of spin-polarised neutrons in the presence of a trapped field in the superconducting sample to spatially map out the critical temperature for the phase transition between superconducting and non-superconducting states. We demonstrate this method on a superconducting crystal of the prototypical high-temperature superconductor (La,Sr)$_2$CuO$_4$. The results, which are backed up by complementary magnetic susceptibility measurements, show that the method is able to resolve minor variations in the transition temperature across the length of the LSCO crystal, caused by inhomogeneities in strontium doping.
