Probing the superconducting pairing symmetry from spin excitations in BiS${}_2$ based superconductors

Abstract

Starting from a two-orbital model and based on the random phase approximation, spin excitations in the superconducting state of the newly discovered BiS${}_2$ superconductors with three possible pairing symmetries are studied theoretically. We show that spin response is uniquely determined by the pairing symmetry. Possible spin resonance excitations might occur for the d-wave symmetry at an incommensurate momentum about $(0.7\pi ,0.7\pi )$. For the p-wave symmetry the transverse spin excitation near $(0,0)$ is enhanced. For the s-wave pairing symmetry there is no spin resonance signature. These distinct features may be used for probing or determining the pairing symmetry in this newly discovered compound.

4 pages, 5 figures

References in corpus (1)

• Superconducting and thermoelectric properties of new layered Superconductor Bi4O4S3

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