| Budget Amount *help |
¥27,950,000 (Direct Cost: ¥21,500,000、Indirect Cost: ¥6,450,000)
Fiscal Year 2014: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2013: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2012: ¥13,520,000 (Direct Cost: ¥10,400,000、Indirect Cost: ¥3,120,000)
Fiscal Year 2011: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
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| Outline of Final Research Achievements |
We study the ground state of IPA-Cu(ClxBr1-x)3 for 0<x<1. For x=0.95, we found that bond randomness contributes to a temperature independent broadening and blue-shift of the magnon resonance at temperatures T>12.5 K. For x=0.83, we observed some ESR branches for typical antiferromagnetic modes with biaxial anisotropy. We have analyzed the magnetization curve and the ESR excitation modes for H//b by using a two sub-lattice model and obtained good agreement between experiment and calculation. For x=0.3, 0.25, we investigated by muSR. The Fourier spectrum of electron spin fluctuation obtained by LF-muSR technique shows that there exists soft-mode toward a possible phase transition to an exotic phase such as Bose-glass.
Furthermore, we study magnetic properties of triangular spin tubes composed of CsCr1-xAxF4 and KCr1-xAxF4 (A= Al, Ga, Fe), which consisted of one-dimensional Heisenberg antiferromagnets coexisting with geometrically-frustrated spin systems with bond randomness.
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