铜氧化物超导体中掺杂剂空间分布的无损表征
Non-destructive characterisation of dopant spatial distribution in cuprate superconductors
摘要：
在研究超导性时，对所研究样品进行适当的表征至关重要，因为杂质和掺杂不均匀性会影响所测量系统的物理特性。我们提出了一种方法，其中极化中子成像设置利用旋进的自旋极化中子在超导样品中的存在下，在空间上映射出超导和非超导状态之间的相变的临界温度。我们证明了这种方法的超导晶体的原型高温超导体（La，Sr）$_2$ CuO $_4$。的结果，这是由互补的磁化率测量支持，表明该方法能够解决在整个长度的LSCO晶体，在锶掺杂的不均匀性所造成的转变温度的微小变化。
英文摘要：
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.
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