Transport in Quantum Structures of Diluted Magnetic Semiconductors

• Authors: J. Jaroszyński
• Languages of publication: EN

Abstracts

EN

This paper reviews recent millikelvin studies of magnetoconductance and noise in nanostructures of a diluted magnetic semiconductor n-Cd_{1-x}Mn_{x}Te. These studies were particularly rewarding for probing the influence of magnetic ions upon mesoscopic phenomena. The accumulated results demonstrated the existence of a new driving mechanism of the universal conductance fluctuations in magnetic systems. Several signatures of spin-glass freezing were observed, such as the appearance of 1/f conductance noise, aging, thermal, and magnetic irreversibilities as well as a strong increase in the amplitude of both conductance fluctuations and noise when temperature and the magnetic field were lowered below the freezing line. A statistical analysis of conductance noise made it possible to investigate the nature of excitations in spin-glass phase, and to discriminate between competing theoretical models.

Keywords

EN

73.50.Td; 72.15.Rn; 73.61.Ga; 75.50.Lk

Discipline

• 72.15.Rn: Localization effects (Anderson or weak localization)
• 75.50.Lk: Spin glasses and other random magnets
• 73.61.Ga: II-VI semiconductors
• 73.50.Td: Noise processes and phenomena

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1999
• Volume: 96
• Issue: 5
• Pages: 641-650

Dates

published

1999-11

Contributors

author

J. Jaroszyński

• Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warszawa, Poland

Identifiers

DOI

10.12693/APhysPolA.96.641