Abstract
Recent progress of megagauss field generation and its application to terahertz (THz) spectroscopy are reviewed. A new device feed gap compensator is introduced, which is found to improve the implosion symmetry of electromagnetic flux compression. 600-T fields can be generated reproducibly by this device. Cyclotron resonance (CR) experiments of p-In 1-x Mn x As, n-Cd 1-x Mn x Te and n-ZnO in the THz range have been performed. It has been found that the electron mass is strongly dependent on the magnetic ion concentration. The heavy hole CR is observed at around 460 T; its cyclotron mass (0.455m 0 ) is much larger than the calcuclted value (0.28m 0 ) or the literature value (0.35m 0 ). This fact may indicate the break down of the effective mass theory. The electron cyclotron mass obtained at 10.6 μm (28.3 THz) in n-ZnO is found to be explained by the resonant polaron effect. We also performed the low-temperature THz electron spin resonance experiment up to 150 T. We found the spin-phonon coupled mode in CuGeO 3 and a collective excitation in NaV 2 O 5 above the critical field where the spin gap closes.
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