Anomaly of longitudinal spin susceptibility at superconducting instability inside a magnetic phase

Abstract

We study the longitudinal spin susceptibility inside a magnetically ordered phase, which exhibits a superconducting instability leading to a coexistence of the two ordered phases. Inside the magnetic phase, the superconducting gap acquires a linear term in a magnetic field applied along the direction of the magnetic moment. We find that such a linear term generates a jump of the longitudinal spin susceptibility when the superconducting instability occurs via a continuous phase transition. This anomaly at the superconducting instability is a thermodynamic signature of the microscopic coexistence of superconductivity and magnetism, and can be a general feature associated with the breaking of spin rotational symmetry inside the magnetic phase.

20 pages, 3 figures

References in corpus (6)

• Competition between d-wave superconductivity and antiferromagnetism in the 2D Hubbard model
• Theory of itinerant magnetic excitations in the SDW phase of iron-based superconductors
• Renormalized mean-field analysis of antiferromagnetism and d-wave superconductivity in the two-dimensional Hubbard model
• Observation of small Fermi pockets protected by clean CuO2 sheets of a high-Tc superconductor
• Spin excitations in layered antiferromagnetic metals and superconductors
• Low-energy Spin Excitation in Coexistent Phase of Antiferromagnetism and d-wave Superconductivity

Cited by in corpus (1)

• Spin and bond-charge excitation spectra in correlated electron systems near antiferromagnetic phase