Tuning the patterns of the Fulde-Ferrell-Larkin-Ovchinnikov state by magnetic impurities in d-wave superconductorsXian-Jun Zuo1 and Chang-De Gong2, 1
1 National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University Nanjing 210093, PRC
2 Cross-Strait Center for Statistical and Theoretical Condensed Matter Physics, Zhejiang Normal University Jinhua 321004, PRC
received 22 December 2008; accepted in final form 30 April 2009; published May 2009
published online 3 June 2009
A local structure transition in the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state from checkerboard to stripe pattern induced by magnetic impurities is computationally observed in near-optimally doped d-wave superconductors. In the absence of impurities, the checkerboard pattern of the FFLO state is energetically favorable under a parallel field, while a local structure transition to the stripe pattern occurs when strong magnetic impurities are inserted. This finding provides an avenue to tune the patterns of the FFLO state, and is ready to be checked by neutron scattering and nuclear magnetic resonance experiments. The implication for high-Tc cuprate superconductors is discussed.
74.20.-z - Theories and models of superconducting state.
74.62.Dh - Effects of crystal defects, doping and substitution.
74.81.-g - Inhomogeneous superconductors and superconducting systems.
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