Wurstbauer, Ursula and Wegscheider, Werner (2009) Magnetic ordering effects in a Mn-modulation-doped high mobility two-dimensional hole system. Physical Review B 79 (15), pp. 155444-1.
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We have studied the magnetotransport properties of a manganese (Mn)-modulation-doped high mobility two-dimensional hole system in a strained InAs quantum well (QW) structure. At precisely T=600 mK a phase transition from paramagnetism to ferromagnetism can be observed by a change of the low-field magnetotransport behavior and hysteresis. In the magnetically ordered phase a superposition of positive magnetoresistance and weak antilocalization was detected in the longitudinal resistance Rxx and in the Hall resistance Rxy a superposition of normal, anomalous, and planar Hall effects demonstrating spontaneous magnetization in the QW plane was detected. From extensive analysis of the temperature and magnetic field dependence of the Shubnikov–de Haas oscillations we deduce the effective mass, transport, and quantum-scattering times. The latter indicates presence of small-range scattering potential. From corrections to the Drude conductivity we determine the impurity interaction time, which is significantly reduced in the ferromagnetic phase indicating interaction of the two-dimensional free holes' spin with the localized magnetic moments of 5/2 from Mn ions.
|Institutions:||Physics > Institute of Experimental and Applied Physics > Retired Professors > Group Werner Wegscheider|
|Projects:||SFB 689: Spinphänomene in reduzierten Dimensionen|
|Keywords:||doping profiles, effective mass, ferromagnetic-paramagnetic transitions, Hall effect, hole mobility, III-V semiconductors, indium compounds, magnetic hysteresis, magnetic moments, manganese, molecular beam epitaxial growth, semiconductor doping, semiconductor quantum wells, semimagnetic semiconductors, Shubnikov-de Haas effect, weak localisation|
|Subjects:||500 Science > 530 Physics|
|Created at the University of Regensburg:||Partially|
|Deposited On:||30 Jun 2009 10:18|
|Last Modified:||05 Aug 2009 15:59|
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