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DY: Dynamik und Statistische Physik

DY 3: Spinmodelle

DY 3.10: Vortrag

Montag, 17. März 1997, 12:45–13:00, R1

Magnetic Polaron and complex magnetic Order in (Cd,Mn)Te Structures. — •A.L. Chudnovskiy, B. Rosenow, and R. Oppermann — Institut f"ur Theoretische Physik, Universit"at W"urzburg, Am Hubland, D-97074 W"urzburg

A theory accounting for the specific features of magnetic polaron (MP) in the presence of spin glass order is presented. The selfconsistent equations for i) the polaron magnetisation, ii) the thermodynamically averaged carrier-spin and iii) for the spin glass order parameter are derived and solved. The temperature dependence of these quantities is analysed in detail. The modification of the spin glass phase due to the presence of the exchange field of the carrier inside the magnetic polaron volume is investigated. The dynamical aspects of the MP formation are discussed. The onset of spin glass order leads to a plateau-like flattening in the temperature dependence of the MP energy. The experimental data on the temperature dependence of the exciton magnetic polaron energy in (Cd,Mn)Te are fitted with the solutions of spin glass equations.