Noncubic symmetry in Ca 1-x Eu x B 6 (0.15>~ x≤ 1.00): An electron-spin-resonance study (original) (raw)
The Eu 2+ ͑4f 7 , S =7/2͒ g value in Ca 1−x Eu x B 6 ͑0.15Շ x ഛ 1.00͒ was measured by means of electron spin resonance at two frequencies ͑fields͒, 9.4 ͑Ϸ3.4 kOe͒ and 34.4 GHz ͑Ϸ12.1 kOe͒. The g value was found to be anisotropic and magnetic-field dependent. The amplitude of the anisotropy increases at low temperatures. The observed angular and temperature dependences of the g value suggest tetragonal symmetry caused, presumably, by a distortion along a direction perpendicular to the largest crystal face, the ͓001͔ direction. Due to the platelet shape of the samples, part of the anisotropy of the g value can also be attributed to demagnetization effects. The g values decrease at higher fields, which is interpreted in terms of a two-band model involving an exchange interaction between the localized Eu 2+ 4f 7 electrons with conduction Eu 2+ 5d-like electrons and B 2p-like holes.
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