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Angular dependence of the upper critical field B c2 for CeCu 2 Si 2
Author(s) -
Vieyra Hugo A.,
Oeschler Niels,
Jeevan Hirale S.,
Geibel Christoph,
Steglich Frank
Publication year - 2010
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200983047
Subject(s) - anisotropy , pauli exclusion principle , condensed matter physics , magnetic field , critical field , field (mathematics) , electrical resistivity and conductivity , physics , paramagnetism , plane (geometry) , superconductivity , optics , geometry , quantum mechanics , mathematics , pure mathematics
The angular dependence of the upper critical field B c2 for A/S‐type CeCu 2 Si 2 samples is determined. Both, the anisotropies within and outside the basal plane are measured using an angle‐resolved resistivity technique, where an external magnetic field serves as a directional probe. Two high‐quality A/S‐type single crystals are studied ( T N ∼ 0.8 K, T c ∼ 0.6 K). For the case where the magnetic field rotates within the basal plane, small variations of ∼0.5% are observed and ascribed to sample misalignment. When the magnetic field rotates from the basal plane towards the [001] direction, a strong anisotropy of B c2 (∼20%) is observed. By comparing the expected orbital‐ and Pauli‐limiting fields, the strong effect of Pauli paramagnetism is realized. The latter is taken into account when using the anisotropic mass model to study the field anisotropy. Deviations are observed from such a conventional model.