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): 155444. ISSN 1098-0121,
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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 R(xx) and in the Hall resistance R(xy) 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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | QUANTUM-WELLS; ELECTRON-GAS; SCATTERING TIMES; MAGNETORESISTANCE; HETEROSTRUCTURES; LAYERS; MASS; 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 |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Group Werner Wegscheider |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 21 Sep 2020 05:11 |
| Last Modified: | 21 Sep 2020 05:11 |
| URI: | https://pred.uni-regensburg.de/id/eprint/29231 |
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