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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 20.155: Poster

Tuesday, March 28, 2006, 15:15–19:15, P1

Electronic structure and magnetism of CeMnNi₄ — •Elena Voloshina¹, Yury Dedkov², Manuel Richter³, and Peter Zahn⁴ — ¹Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, 01187 Dresden, Germany — ²Institut für Festkörperphysik, Technische Universität Dresden, 01062 Dresden, Germany — ³IFW Dresden e.V., P.O. Box 270 016, 01171 Dresden, Germany — ⁴Fachgruppe Theoretische Physik, Fachbereich Physik, Martin-Luther-Universität Halle, 06099 Halle/Saale, Germany

Theoretical investigations of the electronic band structure and ferromagnetism of CeMnNi₄ have been performed by means of LSDA approach. Recent experiments show that this compound has relatively large transport spin polarization (of about 66%) that is in contradiction with present LSDA results. Calculated full magnetic moment of 4.88 µ_B is in good agreement with determined experimentally value. Since a parent compound CeNi₅ is a Pauli paramagnet, the ferromagnetic ordering in the ground state should arise due to the ordering of the high Mn²⁺ magnetic moments. This fact is confirmed by present calculations.