Combined Paramagnetic and Diamagnetic Response of YBCO

Details Combined Paramagnetic and Diamagnetic Response of YBCO Combined Paramagnetic and Diamagnetic Response of YBCO

2000-04-10

arxiv.org/abs/cond-mat/0004152v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.62.14511

It has been predicted that the zero frequency density of states of YBCO in the superconducting phase can display interesting anisotropy effects when a magnetic field is applied parallel to the copper-oxide planes, due to the diamagnetic response of the quasi-particles. In this paper we incorporate paramagnetism into the theory and show that it lessens the anisotropy and can even eliminate it altogether. At the same time paramagnetism also changes the scaling with the square root of the magnetic field first deduced by Volovik leading to an experimentally testable prediction. We also map out the analytic structure of the zero frequency density of states as a function of the diamagnetic and paramagnetic energies. At certain critical magnetic field values we predict kinks as we vary the magnetic field. However these probably lie beyond currently accessible field strengths.

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