Magnetooptical microwave spectroscopy of the coherent magnetic state in the mixed valence compound SmB6 in the frequency range 40–120 GHz
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In undoped pure single crystals of the mixed valence compound SmB6 anomalous ESR absorption is observed in the frequency range v=40–120 GHz at temperatures of 1.8–4.2 K. The ESR for the case of the coherent ground state consists of two components corresponding to g-factors g1=1.907±0.003 and g2=1.890±0.003. The amplitude of both ESR lines strongly depends on temperature in the temperature range studied: the amplitude of the first line with g=g1 increases and the amplitude of the second line decreases with temperature. A model based on consideration of intrinsic defects in the SmB6 crystalline lattice, with a densit ∼1015−1016 cm−3, is suggested as an explanation for the anomalous ESR-behavior. In the frequency range v>70 GHz at T=4.2 K, in addition to the main ESR lines, a new magnetic resonance with a hysteretic field dependence is discovered.
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- 1.T. Kasuya, Europhys. Lett. 26, 283 (1994).Google Scholar
- 4.V. V. Moschalkov, I. V. Berman, N. B. Brandt et al., J. Magn. Magn. Mater. 47&48, 289 (1985).Google Scholar
- 7.H. Ohta, R. Tanaka, M. Motokawa et al., J. Phys. Soc. Jpn. 60, 1361 (1991).Google Scholar
- 9.K. Kojima, M. Kasaya, and Y. Koi, J. Phys. Soc. Jpn. 44, 1124 (1978).Google Scholar
- 11.T. Uemura, Y. Chiba, S. Kunii et al., J. Phys. Soc. Jpn. 55, 43 (1986).Google Scholar
- 15.S. V. Demishev, A. V. Semeno, N. E. Sluchanko et al., Phys. Rev. B 53, 12794 (1996).Google Scholar
- 16.A. Gurevich and G. Melkov, Magnetic Oscillations and Waves (Nauka, Moscow, 1994), p. 77.Google Scholar
- 17.T. Uemura, Y. Chiba, M. Hagiwara, and M. Date, J. Phys. Soc. Jpn. 55, 3737 (1986).Google Scholar
- 18.S. A. Al’tshuler and B. M. Kozyrev, Electron Paramagnetic Resonance (Academic Press, New York and London, 1964), p. 15.Google Scholar