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Magnetic Resonance Study of p‐Type 3C SiC Microparticles
Author(s) -
Savchenko Dariya,
Yukhymchuk Volodymyr,
Skoryk Mykola,
Ubyivovk Evgeniy,
Mokhov Evgenii,
Lančok Jan,
Shanina Bela,
Kalabukhova Ekaterina
Publication year - 2020
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.202000306
Subject(s) - electron paramagnetic resonance , excited state , jahn–teller effect , anisotropy , resonance (particle physics) , isotropy , chemistry , raman spectroscopy , relaxation (psychology) , condensed matter physics , ground state , molecular physics , materials science , atomic physics , nuclear magnetic resonance , physics , ion , social psychology , psychology , organic chemistry , quantum mechanics , optics
The silicon carbide (SiC) 3C polytype microparticles with p‐type conductivity are investigated by X‐band electron paramagnetic resonance (EPR) technique in a wide temperature interval. Morphological and Raman studies show that the mean particle diameter is ≈8 μm, and the SiC polytype is purely 3C. At T = 10 K, the EPR spectrum of the shallow boron acceptor substituting cubic site (B K ), with C 3V symmetry and anisotropic g ‐ and A ‐tensors resulting from static Jahn–Teller effect, is observed. At T > 30 K, a continuous transition from static to dynamic Jahn–Teller effect for B K is detected. The temperature‐dependent B K principal g ‐values are explained by the transitions between the ground and excited vibronic states of B K . At T = 130–150 K, the B K center is characterized by T d symmetry and isotropic g ‐ and A ‐tensors. At T = 60–190 K, an additional single EPR Lorentzian line with short spin relaxation times and isotropic g ‐value close to B K average g ‐value is observed. It was explained by averaging the anisotropic spectrum caused by rapid transitions between the boron ground and excited vibronic states split by Jahn–Teller potential. In addition, the EPR signal from carbon vacancy with characteristic superhyperfine structure is observed at T = 10–298 K.