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Probing the Superconducting Pairing Symmetry from Spin Excitations in BiS2 Based Superconductors

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Abstract

Starting from a two-orbital model and based on the random phase approximation, spin excitations in the superconducting state of the newly discovered BiS2 superconductors with three possible pairing symmetries are studied theoretically. It is found that the spin response is uniquely determined by the pairing symmetry. Possible spin resonance excitations may occur at an incommensurate momentum about (0.7π,0.7π) for the d-wave symmetry, while the transverse spin excitation near (0,0) is enhanced for the p-wave symmetry and no spin resonance signature is seen for the s-wave pairing symmetry. These distinct features may be used for probing or determining the pairing symmetry in this newly discovered compound.

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Acknowledgements

This work was supported by the NSFC (No. 11004105), the RGC of Hong Kong (Nos. HKU7055/09P and HKUST3/CRF/09) and JiangSu Qinglan engineering project.

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Authors and Affiliations

  1. College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

    Tao Zhou

  2. Department of Physics and Center of Theoretical and Computational Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China

    Tao Zhou & Z. D. Wang

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  1. Tao Zhou
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  2. Z. D. Wang
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Correspondence to Tao Zhou.

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Zhou, T., Wang, Z.D. Probing the Superconducting Pairing Symmetry from Spin Excitations in BiS2 Based Superconductors. J Supercond Nov Magn 26, 2735–2740 (2013). https://doi.org/10.1007/s10948-012-2073-4

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  • DOI: https://doi.org/10.1007/s10948-012-2073-4

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