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- 저자 : Hirotaka Manaka (검색결과 3 건)
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Spin Dynamics of Triangular Spin Tubes
Hirotaka Manaka,Yoko Miura 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We performed temperature (T) dependence experiments on the AC magnetic susceptibility ofequilateral and non-equilateral triangular spin tubes CsCrF4 and α-KCrF4, respectively. In α-KCrF4, the linear (X00 ) and the nonlinear (X02 ) magnetic susceptibilities show sharp peaks at 4.0 K,which corresponds to an antiferromagnetic phase transition. On the other hand, in CsCrF4, broadand positive X00 (T) peaks appear above f = 31 Hz at T '4 K, but no anomaly of X00 (T) occurs atf = 31 Hz. Furthermore, the X02 (T) curve at f = 977 Hz shows a broad and negative peak at T 3K.We suspect that there is a gradual change in spin dynamics below T '4 K from the paramagneticstate at a high temperature to a slowly-fluctuating spin state without typical antiferromagnetic longrangeorder as one-dimensionality along the spin tubes coexists with geometrical spin frustration inthe equilateral triangular planes.
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Triangular Spin Tubes with Bond Randomness
Yoko Miura,Hirotaka Manaka 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We performed X-ray diffraction, magnetic susceptibility, and magnetization experiments on nonequilateraltriangular spin tubes composed of α-KCr1−xFexF4 (x = 00.13), which consisted ofone-dimensional Heisenberg antiferromagnets coexisting with geometrically-frustrated spin systemswith bond randomness. The variation of lattice parameters with x may indicate that the Fe3+ions constitute the low-spin state (S = 1/2). As a result of analyses of the frustration factor andthe spin-flop transition field, we found that the effect of geometrical spin frustration was enhancedand that the magnetic anisotropy was weakened as x was increased. Because these results areremarkably similar to the previous results for α-KCr1−xAlxF4, the effect of the chemical impuritysubstitutions, whether they are magnetic or nonmagnetic ions, on α-KCrF4 is clearly understood.
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Antiferromagnetic Resonance in the Quasi-one-dimensional Magnet IPACu(ClxBr1−x)3 (x=0.83)
Takahito Fujita,Masayuki Hagiwara,Hirotaka Manaka 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We have performed multi-frequency electron spin resonance (ESR) and magnetization measurementson single crystals of the quasi one-dimensional magnet IPACu(ClxBr1−x)3 (x=0.83) in magneticfields H along the b-axis at temperatures below an antiferromagnetic long-range orderingtemperature (TN ' 13 K). We observed some ESR branches for typical antiferromagnetic modeswith biaxial anisotropy at 1.5 K ( TN). We have analyzed the magnetization curve and the ESRexcitation modes for Hkb by using a two sub-lattice model and obtained good agreement betweenexperiment and calculation. In addition, we show that the origin of a field-induced magnetizationjump is a spin-flop transition. These results show that the phase at temperatures below TN in thisCl-Br mixed compound can be described as a simple two sub-lattice antiferromagnet.
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