Dresden 2006 – wissenschaftliches Programm

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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 20.163: Poster

Dienstag, 28. März 2006, 15:15–19:15, P1

Correlation of Transport and Magnetism in manganese pnictides and rare earth manganites - are they due to double exchange? — •Klaus Baerner¹, Vladimir Morchshakov¹, Murad Annaoasov², and Mostafa Boshata³ — ¹Physical Department, University of Göttingen, F. Hund Platz 1, 37077 Göttingen, Germany — ²Institute of Advanced Technologies Research and Development, Eastern Mediterranean University, Famagusta, Northern Cyprus, via Mersin 10, Turkey — ³Solid State Physics Dept., National Research Center, NRC, 12332 Dokki, Cairo, Egypt

MnAs and its derivates enjoy a renewed interest because of their use as spininjectors, another surge in magnetocaloric cooling efforts and because recently for valence mixed manganites R1-xAxMnO3 (R: rare earth, A: alkaline earth), which exhibit a correlation of ferromagnetism and metallicity due to double exchange coupling, a new (recursive) approach to calculate the electronic and magnetic states has been proposed, combining spin fluctuation theory and spindependent bandstructure calculations1,2. In this contribution magnetisation, resistivity and phase diagrams of selected manganites R1-xAxMnO3 and pnictides MnIV (IV: As, P, Sb, Bi) are compared. The equivalencies strongly indicate that indeed the manganese pnictides, which are rich on phenomena like the doped rare eart h manganites are candidates for that new approach.