Weak ferromagnetism induced by the external field above TN in GdzCuO4.

Focuses on a study which observed weak ferromagnetism in gadolinium[sub 2] copper oxide[sub 4] which was induced by the external field above the Néel temperature T[sub N] alternating current measurements. Comparison of the shift of the electron-spin-resonance line of the Gadolinium ions as a function of temperature T, deltaH[sub r](T) with the static internal field H[sub t](T); Methodology of the study; Results and discussion.