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VOLUME 46 (1987) | ISSUE 7 | PAGE 292
ESR in the Y1-x GdxBa2Cu3Oy system
The ESR spectrum of Cu2+ and Gd3+ ions has been observed and identified in the superconducting system Yx _ x Gdx ÷Á2óÉ30^. The integral of the exchange interaction of Gd3+ ions with conduction electrons is found: Jsf — 7.4 X 10 ~3 eV. The energy gap is estimated to be 2k0/kB Tc~6.5. The integral of the exchange interaction between Gd3 + ions is estimated to øÅ/ÏΙ = 0.12 ë.