TY - JOUR
T1 - Electron spin resonance of defect-rich vanadium oxide nanotubes
AU - Won Lee, Kyu
AU - Kweon, Hyocheon
AU - Lee, Cheol Eui
N1 - Funding Information:
This work was supported by the Korea Ministry of Education, Science and Technology (NRL Program Contract No. R0A-2008-000-20066-0, User Program of Proton Engineering Frontier Project, Contract No. 20090082672), and by the Seoul Research and Business Development Program (Grant No. 10583). The measurements at the Korean Basic Science Institute (KBSI) are acknowledged.
PY - 2009
Y1 - 2009
N2 - We have studied defect-rich vanadium oxide nanotubes, with reduced V 4+ concentration, by means of x-ray diffraction, infrared spectroscopy, x-ray photoemission spectroscopy, and electron spin resonance (ESR) measurements. In particular, prominent anomalies at 320 and 370 K attributed to structural phase transitions were manifest in the ESR measurements. The ESR spin susceptibility exhibited a singlet-triplet transition of the spin dimers and an antiferromagnetic exchange coupling. In the high-temperature region above 370 K, where the two distinct ESR lines merged, an activation energy of the fast hopping polaron motion, 0.48 eV, was obtained.
AB - We have studied defect-rich vanadium oxide nanotubes, with reduced V 4+ concentration, by means of x-ray diffraction, infrared spectroscopy, x-ray photoemission spectroscopy, and electron spin resonance (ESR) measurements. In particular, prominent anomalies at 320 and 370 K attributed to structural phase transitions were manifest in the ESR measurements. The ESR spin susceptibility exhibited a singlet-triplet transition of the spin dimers and an antiferromagnetic exchange coupling. In the high-temperature region above 370 K, where the two distinct ESR lines merged, an activation energy of the fast hopping polaron motion, 0.48 eV, was obtained.
UR - http://www.scopus.com/inward/record.url?scp=69749088090&partnerID=8YFLogxK
U2 - 10.1063/1.3208066
DO - 10.1063/1.3208066
M3 - Article
AN - SCOPUS:69749088090
VL - 106
JO - Journal of Applied Physics
JF - Journal of Applied Physics
SN - 0021-8979
IS - 4
M1 - 044313
ER -