Agterberg D F, Dodgson Matthew J W
Department of Physics, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53201, USA.
Phys Rev Lett. 2002 Jul 1;89(1):017004. doi: 10.1103/PhysRevLett.89.017004. Epub 2002 Jun 17.
For multicomponent superconductors, it is known that the presence of symmetry breaking fields can lead to multiple superconducting phase transitions. Motivated by recent small angle neutron scattering experiments on the vortex state of UPt3, the London theory in the vicinity of such phase transitions is determined. It is found that the form of this London theory is in general quite different than that for conventional superconductors. This is due to the existence of a diverging correlation length associated with these phase transitions. One striking consequence is that nontrivial vortex lattices exist arbitrarily close to H(c1). Applications to UPt3, CeIn3, U(1-x)Th(x)Be(13), electron doped cuprate superconductors, Sr(2)RuO(4), and MgCNi(3) are discussed.
对于多组分超导体，已知对称破缺场的存在会导致多个超导相变。受近期关于UPt3涡旋态的小角中子散射实验的启发，确定了此类相变附近的伦敦理论。结果发现，该伦敦理论的形式总体上与传统超导体的有很大不同。这是由于与这些相变相关的关联长度发散所致。一个显著的结果是，在任意接近H(c1)处都存在非平凡的涡旋晶格。文中讨论了其在UPt3、CeIn3、U(1-x)Th(x)Be(13)、电子掺杂铜酸盐超导体、Sr(2)RuO(4)和MgCNi(3)中的应用。
