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RISS 인기검색어
- 검색키워드
- 저자 : J. Jaroszynski (검색결과 2 건)
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Magnetoresistance of Iodine-Doped CdMnTe/CdMgTe Spin Quantum Wells
V. Kolkovsky,M. Wiater,T. Wojtowicz,G. Karczewski,J. Jaroszynski 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
Single Cd1-xMnxTe quantum wells embedded in nonmagnetic Cd1-MgyTe barriers were grown by using molecular beam epitaxy (MBE). The Cd1-xMnxTenCd1-MgyTe structures were modulation doped by using iodine donors. The manganese (x) and the magnesium (y) contents were carefully adjusted to obtain the same values of the energy band gaps in both materials. A composition adjustment was achieved based on photoluminescence measurements. The magnetoresistance measurements were carried out in the temperature range from 1.6 K to 300 K and at magnetic fields up to 9 T. The analysis of the Hall effect measurements indicated that increasing of the magnetic eld caused the formation of a quantum well in the conduction band of the magnetic Cd1-MnxTe layer. This effect caused a transfer of quasi-free electrons from a 3D conducting channel located in the non-magnetic Cd1-MgyTe barriers to a magnetically-induced 2D quantum well. As expected, the electrons localized in the 2D conduction channel were highly mobile, which was manifested by the appearance of Shubnikov-de Haas oscillations.
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Colossal Magnetoresistance in (Cd,Mn)Te heterostructures
T. Andrearczyk,W. Zaleszczyk,M. Wiater,T. Wojtowicz,M. Sawicki,G. Karczewski,T. Dietl,Dragana Popovic,J. Jaroszynski 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.1
We report on magnetotransport in diluted magnetic 2D modulation doped (Cd,Mn)Te quantum wells and 3D bulk (Cd,Mn)Se samples. The application of magnetic elds reveals features commonly observed in colossal magnetoresistant (CMR) materials, such as a strong negative magnetoresistance and dramatic and nonmonotonic changes in the zero-eld resistance, which coincide with the fer- romagnetic ordering. These phenomena are present near the metal-insulator transition (MIT), yet another common property of CMR systems. Most likely, the observed CMR-like features re ect nanoscale phase separation of the electron uid and the emergence of ferromagnetic clusters in an intermediate density region. Our results suggest that the clustering around the MIT is ubiquitous not only in CMR manganites and underdoped cuprates but also in disordered semiconductors. We report on magnetotransport in diluted magnetic 2D modulation doped (Cd,Mn)Te quantum wells and 3D bulk (Cd,Mn)Se samples. The application of magnetic elds reveals features commonly observed in colossal magnetoresistant (CMR) materials, such as a strong negative magnetoresistance and dramatic and nonmonotonic changes in the zero-eld resistance, which coincide with the fer- romagnetic ordering. These phenomena are present near the metal-insulator transition (MIT), yet another common property of CMR systems. Most likely, the observed CMR-like features re ect nanoscale phase separation of the electron uid and the emergence of ferromagnetic clusters in an intermediate density region. Our results suggest that the clustering around the MIT is ubiquitous not only in CMR manganites and underdoped cuprates but also in disordered semiconductors.
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