Magnetization Process of an S = 1/2 Tetramer Chain with Ferromagnetic-Ferromagnetic-Antiferromagnetic-Antiferromagnetic Bond Alternating Interactions

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We report the results of magnetic susceptibility (x) and high field magnetization measurements on single crystal samples of a copper chain compound Cu(3-Clpy)_2(N_3)_2 (3-Clpy = 3-chloropyridine, C_5H_4NCl) that is regarded as an S = 1 /2 tetramer chain with ferromagnetic-ferromagnetic-antiferrmagnetic-antiferromagnetic bond alternating interactions. As the temperature (T) is decreased, the _xT exhibits a round minimum at about 10 K and a successive abrupt increase, which is typical of a quantum ferrimagnet. The magnetization curves up to 40 T in a pulsed magnetic field at 1.3K shows a steep increase around zero field and a plateau up to 27 T followed by a steep increase before saturation. Since we observed large hystereses around zero field and saturation field in pulsed fields, we performed the magnetization measurements under static fields up to 35 T to get equilibrium magnetizations and compared them witn the calculated ones. The calculated magnetization at each magnetic site against magnetic fields indicates a spin reduction probably arising from the quantum many body effect except at the site which ferromagnetically couples to both neighboring sites.
社団法人日本物理学会の論文
2003-04-15