| Budget Amount *help |
¥25,090,000 (Direct Cost: ¥19,300,000、Indirect Cost: ¥5,790,000)
Fiscal Year 2020: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2019: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2018: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000)
Fiscal Year 2017: ¥12,220,000 (Direct Cost: ¥9,400,000、Indirect Cost: ¥2,820,000)
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| Outline of Final Research Achievements |
An elementary excitation in spin ice shows similar properties of the Dirac monopole that interacts with magnetic Coulomb forces. However, it has not been clarified whether the excitation manifests itself as a magnetic relaxation phenomenon or it can behave like a quasiparticle with a cooperative phenomenon. In this study, we have focused on Dy2Ti2O7and Tb2Ti2O7, and studied novel elementary excitation phenomena in spin ice, such as two-dimensional (2D) monopoles and quantum monopoles. We have found that the ac frequency dependent magnetic susceptibility in the 2D spin ice of Dy2Ti2O7 shows a single scaling form, which can be understood in terms of the dynamical scaling low for 2D Coulomb gas system (Phys. Rev. B 90, 144428 (2014).). We also realized for Tb2Ti2O7 that the behavior of the monopole characterized by a quantum spin ice could be clarified as information on thermal excitation. These studies shed light on the novel dynamics of monopole phenomenon in condensed matter physics.
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