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- 저자 : M. Sawicki (검색결과 1 건)
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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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