| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
Superconductivity in PrIr2Zn20 appears at Tc = 0.05 K in the presence of an antiferroquadrupolar order below TQ = 0.11 K. We have studied pressure dependences of Tc, TQ by using two pressure transmitting media: argon maintaining highly hydrostatic pressure and glycerol which solidifies above 5 GPa producing non-hydrostatic pressure. Upon applying P with argon up to 10.6 GPa, Tc hardly changes while TQ monotonically increases from 0.11 K to 0.23 K. With glycerol, however, TQ and Tc simultaneously fall below 0.04 K at 6.3 GPa. The contrasting results indicate that onsite quadrupolar fluctuations induce superconductivity in this compound.
The downward behavior in the resistivity of NdCo2Zn20 up to 13 GPa can be reproduced by the theoretical formula based on the two channel Kondo effect.
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