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VOLUME 41 (1985) | ISSUE 10 | PAGE 421
Anisotropy of the critical field in CeCu2Si2
An anisotropy (~170%) of the derivative of the upper critical field at Τ = Tc has been observed in the compound CeCu2Si2 during rotation of Η in a plane near the basis plane. This anisotropy indicates that the superconducting gap may vanish along a line on the Fermi surface in this compound, in which a superconductivity arises in a heavy-fermion system at pressures ρ ^ 1 kbar. The anisotropy disappears at ρ > 9 kbar.