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VOLUME 53 | ISSUE 12 | PAGE 637
Magnetization versus external magnetic field in layered superconductors
For an anisotropic layered superconductor we have calculated the magnetization versus the absolute value and orientation of the external magnetic field. The curve displays a cusp at a field = (θ), where θ is the angle between the field and the layers, and a maximum at a certain characteristic field = 3 (θ) (sin θ) ~ 1, in agreement with the experimental measurements by Ν. V. Zavaritsky and V. N. Zavaritsky. We predict the existence of an intermediate critical field = 2 (θ) <χ (sin θ) ~ ', at which the component of the magnetic induction perpendicular to the layers first penetrates the sample. The magnetic susceptibility j = / has a jump , = 2{9). The jump is very small at 6?> γ ~1, where ^is the anisotropy coefficient. In this range of angles one can observe a cusp on a graph of χ vs^at = 2. This prediction of the theory is in good agreement with the experiment.2

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