EPR and AFMR of Li_2CuO_2 in Submillimeter Wave Region

概要

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Paramagnetic and antiferromagnetic resonances have been observed for powder samples of Li_2CuO_2 in submillimeter wave region using pulsed magnetic fields at temperatures from 1. 9 K to 265 K. At the paramagnetic state, the g-values have been determined to be g_<⫽>= 2.30 and g_⊥=2.01. The line-width estimated from the powder signal increases as the frequency increases. Antiferromagnetic resonance modes along the principal axes have been clearly observed even in the powder samples below the Neel temperature and explained by the conventional antiferromagnetic resonance theory. It has been found that the easy axis is parallel to the direction of g_<⫽> and the anisotropy is almost uniaxial and fairly strong. This fact is quite different from other antiferromagnetic copper oxides. Obtained parameters by AFMR are A=90 mol/emu, A'_x=0. 061 A, A'_y=-0. 021 A, A'_z=-0.040A, Γ'_x=-0.028 A, Γ'_y=0.018 A and Γ'_z=0.010 A.
社団法人日本物理学会の論文
1993-02-15