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Keywords:

Science & Technology, Physical Sciences, Physics, Condensed Matter, Physics, 0204 Condensed Matter Physics, 0206 Quantum Physics, 0303 Macromolecular and Materials Chemistry, General Physics, 5104 Condensed matter physics

Abstract:

We have measured the temperature dependence of the DC electrical resistivity and susceptibility in the interval 4.2-300 K for Nd1-xCaxSr2Cu2FeOδ (x = 0.0, 0.1, 0.2 and 0.3). Analysis of the results showed the density of states to be a strong function of x, indicating the existence of short range fluctuations near the Fermi level EF. The magnetic susceptibility, however, shows the oxidation state of Fe remains at +3 for x ≥ 0. © 1994.