Abstract
ESR investigation of the system Eu x Sr 1- x S is presented for 0.01 < x<1 as a function of temperature and, at room temperature, for 4.5, 9.3 and 35 GHz. For x>0.2 the resulting T → ∞ ESR linewidth varies like a + b√ x with a and b decreasing as the frequency increases. This behaviour is compatible with exchange narrowed dipolar width, as proposed by Levy and Raghavan, with the frequency dependence due to the “10/3” effect.
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