| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
We performed quantum oscillation measurements on SrPt3P and observed part of the Fermi surface. The mass enhancement factors are between 0 and 0.9 for the observed orbits. On the other hand, the Sommerfeld coefficient reported previously suggests the enhancement factor averaged over the whole Fermi surface is approximately 1. This suggests that strong electron-phonon interactions exist on a part of the Fermi surface that is not yet observed.
We performed quantum oscillation measurements on FeSe and determined the Fermi surface. The determined Fermi surface significantly deviates from what band-structure calculations predict. The Fermi surface is anomalously small and the carrier number is approximately 0.01 per Fe, which is one order-of-magnitude smaller than predicted. This indicates that electron correlations that are not included in the calculations are important in determining the electronic structure of FeSe.
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