Impurity effects on the quasiparticle spectrum of the Fulde-Ferrell-Larkin-Ovchinnikov state of a d-wave superconductor

Qian Wang; Chia-Ren Hu; Chin-Sen Ting

doi:10.1103/PhysRevB.74.212501

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Impurity effects on the quasiparticle spectrum of the Fulde-Ferrell-Larkin-Ovchinnikov state of a d-wave superconductor

Qian Wang, Chia-Ren Hu, Chin-Sen Ting

DOI 10.1103/PhysRevB.74.212501 · Physical Review B

T1

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Abstract

In a d-wave superconductor (d-SC), a unitary impurity can induce a near-zero-energy resonant peak in the local tunneling density of states (LTDOS) due to the sign change of the order parameter (OP) on the Fermi surface. If a d-SC is quasi-two-dimensional, a large parallel magnetic field can drive it into the Fulde-Ferrell-Larkin-Ovchinnikov state, with an OP also changing sign in the real space like a checkerboard pattern. This double sign change leads to very subtle effects caused by a unitary impurity in the LTDOS for two locally stable locations of the impurity.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown