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Hyperfine Fields at the Cd Site in La0.67Cd0.25MnO3 CMR Manganites |
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| Authors: | J P Araújo J G Correia V S Amaral P B Tavares F Lencart-Silva A A C S Lourenço J B Sousa J M Vieira J C Soares |
| Institution: | (1) IFIMUP, Universidade do Porto, Rua do Campo Alegre, 687, 4150 Porto, Portugal;(2) CERN-EP, CH 1211 Genève 23, Switzerland;(3) ITN, E.N. 10, P-2685 Sacavém, Portugal;(4) IFIMUP, Universidade do Porto, Rua do Campo Alegre, 687, 4150 Porto, Portugal;(5) Dep. de Física, Universidade de Aveiro, 3810 Aveiro, Portugal;(6) Secção de Química, Universidade de Trás-os-Montes e Alto Douro, 5000 Vila Real, Portugal |
| Abstract: | Although Cd and Ca ions have the same valence and cation size, their incorporation into vacancy-doped La manganites induce different properties. While the incorporation of Ca leads to high Tc up to 250 K and induces a metallic-like behaviour, the incorporation of Cd severely reduces Tc and promotes insulator-like behaviour. In this work, the Cd hyperfine fields have been measured with the Perturbed Angular Correlations (PAC) technique after implantation and annealing of 111m Cd in La–Cd–MnO3 samples. The PAC results are compared with measurements of the resistivity and magnetization performed on the same samples. The mixed La and Mn site Cd occupancy is suggested as a possibility to explain the properties of the La–Cd–MnO3 system. |
| Keywords: | double exchange magnetic oxides colossal magnetoresistance PAC |
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