Abstract
Measurements of the upper critical magnetic field (H c2) of the pseudoternary system La 1.2−xEu xMo 6S 8 were made at temperatures above 1.5 K. An enhancement of the value of H c2 was found for 0 < x ⩽ 0.6. The results are attributed to an increase of the orbital critical field with increasing x, compensation of the applied magnetic field by a negative exchange field due to an antiferromagnetic exchange interaction between the conduction electron spins and the Eu magnetic moments (Jaccarino-Peter effect), and exchange scattering of conduction electrons by the rare earth magnetic moments.
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