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VOLUME 64 (1996) | ISSUE 10 | PAGE 707
Magneto-optical microwave spectroscopy of the coherent magnetic state in the mixed valance compound SmBe in the frequency range 40-120 GHz
In undoped pure single crystals of the mixed valance compound SmBe anomalous ESR absorption has been observed in the frequency range ν ~ 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 g\ ~ 1.9O7±O.O03 and дг — 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 " g\ increases and the amplitude of the second line decreases with temperature. A model based on consideration of the intrinsic defects in the SmBe crystalline lattice having concentration ~ 10'5 — 10'* cm-3 is suggested for the explanation of the anomalous ESR-behaviour. In the frequency range ν >70 GHz at Τ 4.2 К, in addition to the main ESR lines, a new magnetic resonance with an hysteresis-like field dependence is discovered. PACS: 75.30.-m