| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2012: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2011: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2010: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Research Abstract |
To investigate spin-liquid state stability for Dzyaloshinski-Moriya (DM) interaction (antisymmetric exchange interaction), magnetic susceptibility measurements of quantum kagome antiferromagnets ZnCu_3(OH)_6Cl_2 (Herbertsmithite) and Cu_3V_2O_7(OH)_2・2H_2O (Volborthite) have been performed under high-pressure at low temperature. Quantum transition from spin-liquid state to Neel state in these systems cannot observed in high-pressure up to 7.9 kbar at low temperature down to 1.8 K. On the other hand, D terms of DM interaction in quantum-spin kagome like antiferromagnet Cu_2O(SO_4) (Dolerophanite), classical-spin kagome lattice antiferromagnet KCr_3(SO_4)_2(OH_6) (Cr-jarosite) and spin-liquid ground state honeycomb lattice antiferromagnet Bi_3Mn_4O_12(NO_3) have been estimated using high-frequency ESR measurements.
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