Spin Dynamics in Copper Metaborate CuB_2O_4 Studied by Muon Spin Relaxation(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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Copper metaborate CuB_2O_4 was studied by muon spin relaxation measurements in order to clarify its static and dynamic magnetic properties. The time spectra of muon spin depolarization suggest that the local fields at the muon site contain both static and fluctuating components in all ordered phases down to 0.3K. In the weak ferromagnetic phase (20>T>9.3K), the static component is dominant. On the other hand, upon cooling, the fluctuating component becomes dominant in the incommensurate helix phase (9.3>T>1.4K). The dynamical fluctuations of the local fields persist down to 0.3K, where a new incommensurate phase (T<1.4K) is suggested to appear. This result suggests that spins fluctuate even at T→0. We propose two possible origins of the remnant spin fluctuations: frustration of the exchange interactions and the dynamic behavior of the soliton lattice.
社団法人日本物理学会の論文
2006-11-15