Spin dynamics of charge carriers in the process of their localization in {alpha}'-(BEDT-TTF){sub 2}IBr{sub 2} single crystals

Journal Article · Mon Nov 15 04:00:00 EST 2010 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776110110166· OSTI ID:21443343

Dmitriev, A I; Chernen'kaya, A S ^[1]; Yakushi, K ^[2]; Yamamoto, K ^[3]; Tanimoto, Y ^[4]

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1. Russian Academy of Sciences, Institute of Problems of Chemical Physics (Russian Federation)
2. Graduate University for Advanced Studies (Japan)
3. Institute for Molecular Science (Japan)
4. Osaka-Ohtani University, Faculty of Pharmacy (Japan)

Sharp changes in the integral intensity and linewidth of the ESR spectrum that accompany the localization of the charge carriers have been revealed in {alpha}'-(BEDT-TTF){sub 2}IBr{sub 2} crystals. It has been found that the types of localization in two compounds under investigation are different: charge carriers in {beta}''-(BEDT-TTF){sub 4}NH{sub 4}[Cr(C{sub 2}O{sub 4}){sub 3}] are localized on irregular defects of the crystal lattice, whereas charge carriers in {alpha}'-(BEDT-TTF){sub 2}IBr{sub 2} are localized at the regular positions of the unit cell. The exchange narrowing of the ESR line and a sharp decrease in the dc and ac magnetic susceptibilities are observed in {alpha}'-(BEDT-TTF){sub 2}IBr{sub 2} at low temperatures T < 50 K. The dc and ac magnetic susceptibilities observed in {alpha}'-(BEDT-TTF){sub 2}IBr{sub 2} at high temperatures T > 50 K differ from each other, because the thermally activated hopping frequency of the charge carriers is higher than the frequency of the measuring UHF field of an ESR spectrometer.

• OSTI ID: 21443343
• Journal Information: Journal of Experimental and Theoretical Physics, Journal Name: Journal of Experimental and Theoretical Physics Journal Issue: 5 Vol. 111; ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTRA
ANGULAR MOMENTUM
BEDT-TTF
BROMIDES
BROMINE COMPOUNDS
CHARGE CARRIERS
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
ELECTRON SPIN RESONANCE
EPR SPECTROMETERS
HALIDES
HALOGEN COMPOUNDS
HETEROCYCLIC COMPOUNDS
IODIDES
IODINE COMPOUNDS
MAGNETIC PROPERTIES
MAGNETIC RESONANCE
MAGNETIC SUSCEPTIBILITY
MEASURING INSTRUMENTS
MONOCRYSTALS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
ORGANIC SUPERCONDUCTORS
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
RESONANCE
SPECTRA
SPECTROMETERS
SPIN
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE