| Project/Area Number |
16540311
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Yokohama National University |
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Principal Investigator |
UMEHARA Izuru Yokohama National University, Faculty of Engineering, Associate Professor, 大学院・工学研究院, 助教授 (90251769)
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| Co-Investigator(Kenkyū-buntansha) |
UWATOKO Yoshiya University of Tokyo, Institution for solid state physics, Associate Professor, 物性研究所, 助教授 (40213524)
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| Project Period (FY) |
2004 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2005: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2004: ¥2,800,000 (Direct Cost: ¥2,800,000)
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| Keywords | high pressure / specific heat / ac method / constant pressure generation / low temperature / 強相関電子 / 磁性 / 低音物性 / 物性実験 / 交流比熱 |
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| Research Abstract |
It was succeeded in constructing the constant pressure generation system under the pressure up to 4GPa and in the temperature down to 0.75K. The important point to make it possible is using MP30 metal for pressing rod. This is the first system of the world.
We have also constructed the ac caloric measurement system for low temperature and high pressure. In order to make it possible to measure ac calorimetric data, we constructed the new spot welding system. It was spot welded 20 μm Au and Au-Fe0.07 thin wire thermocouples on the samples. We have been measured the heat capacity of CePd_2Si_2 and Ce_2RhIn_8 for the test of this measurement system. It is clearly seen that the anti-ferro magnetic ordering temperature T_N decreases increasing pressure and the jump at T_N smears under the high pressure. This result suggests that Kondo temperature increases and magnetic fluctuation is dominated under high pressure in this material.
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