| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2013: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
This project studies anomalous quantum phenomena of frustrated magnets appearing in magnetic fields by the numerically exact diagonalization method. As a typical case of such magnets in two dimensions, the Heisenberg antiferromagnet on the kagome lattice has long been studied; however, our understanging of this system is still far from the completeness. An open issue is that, although the systems show a small-gradient region of the magnetic field at one-third height of the saturation in their magnetization processes, the behavior is different from well-known magnetic plateaux. By the large-scale parallel calculations in supercomputers including K computer, we have clarified the fact that the case at this height is just on the boundary between two different phases when the system is distorted. We thus pointed out that the anomalous behavior is related to the fact of the phase boundary. We also found in one of the two phases that a magnetization jump owing to the spin-flop phenomenon.
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