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Development and Applications of High-Frequency ESR up to 55 T

Authors :
Hitoshi Ohta
T. Yoshida
Eiji Ohmichi
Reizo Kato
Susumu Okubo
Hidekazu Tanaka
Masashi Fujisawa
Toshihiro Sakurai
N. Souda
M Tomoo
Source :
Appl. Magn. Reson.. 35:399-410
Publication Year :
2009

Abstract

A multiextreme (high-field, low-temperature, high-pressure and nanoscale) electron spin resonance (ESR) measurement system is under development in Kobe. In this connection, our recent development is introduced and two applications of our high-frequency high-field ESR are described. High-frequency high-field ESR measurements of dioptase (Cu6Si6O18·6H2O), which has an interesting antiferromagnetic Cu2+ network, have been performed using a pulsed magnetic field of up to 55 T. Antiferromagnetic resonances (AFMR) are clearly observed at 4.2 K with the light sources of up to 1017 GHz. However, a deviation from the conventional two-sublattice AFMR theory is observed in the high field. Temperature dependence of the X-band and high-frequency ESR has been also observed in the triangular lattice antiferromagnet EtMe3P[Pd(dmit)2]2 which shows the spin-Peierls-like transition below Tc = 25 K. The preliminary field dependence of the spin gap estimated from the analyses of our ESR results has been shown in connection with the previous magnetic susceptibility results.

Details

Language :
English
Volume :
35
Database :
OpenAIRE
Journal :
Appl. Magn. Reson.
Accession number :
edsair.doi.dedup.....69528fce94cf8ff7fd7121cdbe179151