Laboratory for Developments and Methods, Paul Scherrer Institute, CH-5232 Villigen, Switzerland.
Phys Rev Lett. 2010 Mar 26;104(12):127001. doi: 10.1103/PhysRevLett.104.127001. Epub 2010 Mar 25.
We have studied the magnetic order inside the superconducting phase of CeCoIn5 for fields along the [1 0 0] crystallographic direction using neutron diffraction. We find a spin-density wave order with an incommensurate modulation Q=(q,q,1/2) and q=0.45(1), which within our experimental uncertainty is indistinguishable from the spin-density wave found for fields applied along [1 -1 0]. The magnetic order is thus modulated along the lines of nodes of the d{x{2}-y{2}} superconducting order parameter, suggesting that it is driven by the electron nesting along the superconducting line nodes. We postulate that the onset of magnetic order leads to reconstruction of the superconducting gap function and a magnetically induced pair density wave.
我们使用中子衍射研究了 CeCoIn5 在沿[100]晶向的磁场中超导相内的磁有序。我们发现了一种具有非共调调制 Q=(q,q,1/2)和 q=0.45(1)的自旋密度波有序，在我们的实验不确定度范围内，它与沿[1-10]施加磁场时发现的自旋密度波无法区分。因此，磁有序沿着 d{x{2}-y{2}}超导序参量的节点线调制，这表明它是由超导线节点处的电子嵌套驱动的。我们假设磁有序的出现导致超导能隙函数的重构和磁诱导的对密度波。
