^<55>Mn NQR Study at Mn-II Sites in β-Mn Metal : A Possible Effect of Geometrical Frustration(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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^<55>Mn NQR measurements at the Mn-II site in a polycrystalline β-Mn have been performed over the wide temperature range up to 300 K. Fine structures in the NQR spectrum are newly observed below 100K, indicating that a sufficiently large region of the sample has an antiferromagnetic moment with a small magnitude of 〜10^<-4>μ_B. Taking account of the fact that the spectral shape depends on the sample particle size, we suggest that the surfaces of the sample particles affect the electronic ground state of β-Mn and that the staggered moment extends within 3 μm depth from the surface. A role of the geometrical frustration is discussed. The nuclear spin-lattice relaxation rate 1/T_1 and the spin-spin relaxation rate 1/T_2 increase divergently at high temperatures, implying quadrupole relaxation arising from lattice vibrations.
社団法人日本物理学会の論文
2004-08-15