NMR studies of Nd2−x Ce x CuO4
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Copper NMR has been studied as a function of temperature in a number of superconducting Nd2−x Ce x CuO4 samples. The electric field gradient is very small and the Knight shift is 2380 ppm at room temperature, both of these implying that the copper is in a Cu+ state. The Knight shift decreases with temperature particularly belowT c . The spin contribution to the Knight shift is estimated to be ∼ 200 ppm (about a factor ten smaller than in YBa2Cu3O7) indicating thatN s (E F ) at the copper sites is small in this material.
KeywordsNMR Nd-Ce-CuO4 Knight shift
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