| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
We investigated the possibility that the origin of the direct transition from the singlet ground state to the excited triplet states which is observed in the spin gap system consisting of S = 1/2 antiferromagnetic spin dimer is the electromagnon excitation which comes from the spin current mechanism. We developed the frequency sweep type ESR system in THz region. The excitation from the singlet to the Sz = 0 state of the triplet states was successfully observed. Since this excitation is independent on the magnetic field and constant, only frequency sweep type ESR measurement can observe it. By taking the ESR selection rule of this system into account, we concluded that the observed excitation is the electromagnon coming from the spin current mechanism.
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