Abstract

The transition of superconducting antiferromagnets to the normal state under the action of a magnetic field at temperatures below the Néel point TN ≪ TC is investigated. The influence of the orbital effect and exchange interaction of electrons with localized moments is taken into account. Specimens with randomly oriented crystallites, whose dimensions are large in comparison with the superconducting correlation length, are considered. Owing to the anisotropy of the magnetic susceptibility of the antiferromagnet the upper critical field of the crystallite depends on its orientation. The range of fields in which the specimen consists of superconducting and normal crystallites, and the fraction of superconducting crystallites in relation to the magnetic field, are indicated.

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