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MA: Magnetismus
MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)
MA 20.143: Poster
Dienstag, 28. März 2006, 15:15–19:15, P1
Defects and the CMR effect in irradiated by fast neutrons layered lanthanum manganite — •Yakov Mukovskii1, V. Arkhipov2, V. Dyakina2, A. Karkin2, and A. Pestun1 — 1Moscow State Institute of Steel and Alloys, Leninsky prosp. 4, Moscow, 119049, Russia — 2Institute of Metal Physics, Ural Branch of RAS, S.Kovalevskaya st. 18, Ekaterinburg, 620219, Russia
Influence of radiation stimulated disorder (fast neutron irradiation with E {$>$} 1 MeV, T_{rad} {$~$} 300 K, flux F = 2*10^{19} neutron/cm^{2}) on temperature dependencies of AC susceptibility and electric resistance of single crystals of layered manganites La_{1.4}Sr_{1.6}Mn_{2}O_{7} in magnetic field up to 13.6 T. It was observed that the disorder leads to suppression of the magnetic order (T_C {$->$} 0) and to disappearing of metallic character of conductivity. In non magnetic state the CMR effect remains, and its value exceeds an original one. Also kinetics of the properties recovering under annealing was studied. The work was supported by the RFRB grant {∖#}02-02-16425 and ISTC grant {∖#}1859.