Detection of the Ferromagnetic Properties of Si:P in the Region of an Insulator–Metal Phase Transition

The ferromagnetic properties of Si:P in the region of a concentration insulator–metal phase transition at liquid helium temperatures have been detected and studied. To determine the spin component of the magnetization, the diamagnetic contribution linear in field has been subtracted from the total m...

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Bibliographic Details
Published in:JETP letters 2022-06, Vol.115 (11), p.685-690
Main Authors: Veinger, A. I., Zabrodskii, A. G., Lahderanta, E., Semenikhin, P. V.
Format: Article
Language:English
Subjects:
Antiferromagnetism
Atomic
Atomic energy levels
Biological and Medical Physics
Biophysics
Compensation
Condensed Matter
Diamagnetism
Ferromagnetic phases
Ferromagnetism
Hysteresis loops
Liquid helium
Low temperature
Magnetization
Molecular
Optical and Plasma Physics
Particle and Nuclear Physics
Phase transitions
Physics
Physics and Astronomy
Quantum Information Technology
Solid State Physics
Spintronics
Superconducting quantum interference devices
Transition points
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Summary:The ferromagnetic properties of Si:P in the region of a concentration insulator–metal phase transition at liquid helium temperatures have been detected and studied. To determine the spin component of the magnetization, the diamagnetic contribution linear in field has been subtracted from the total magnetizations of samples measured by a SQUID magnetometer. The spin magnetization has strong nonlinearity with saturation in fields of about several oersteds and a hysteresis loop, which are characteristic of ferromagnets. The capability of magnetization decreases sharply with the shift away from the phase transition point on the insulator side of the phase transition. However, it increases strongly at a nearly half degree of compensation of Si:P by acceptor impurities. The results indicate that the triplet state for some pairs of exchange-coupled spins (ferromagnetic phase) in Si:P in the region of the insulator–metal phase transition at low temperatures is more energy favorable than the singlet state (antiferromagnetic phase) largely because of a moderate compensation.
ISSN:0021-3640
1090-6487
DOI:10.1134/S0021364022600872