Magnetic properties of ferromagnetic lanthanoid elements under high pressures
| Project/Area Number |
17H03379
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical properties of metals/Metal-base materials
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| Research Institution | Kyushu Institute of Technology |
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Principal Investigator |
Mito Masaki 九州工業大学, 大学院工学研究院, 教授 (60315108)
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| Co-Investigator(Kenkyū-buntansha) |
中村 和磨 九州工業大学, 大学院工学研究院, 准教授 (60525236)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000)
Fiscal Year 2019: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2017: ¥8,060,000 (Direct Cost: ¥6,200,000、Indirect Cost: ¥1,860,000)
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| Keywords | ランタノイド / 希土類金属 / 強磁性 / 高圧力 / 磁気測定 / ランタノイド系希土類金属 / 磁化率 / 第一原理計算 / 希土類金属磁性 / 高圧力実験 / 精密磁気測定 / 金属物性 / 物性実験 / 低温物性 / 希土類元素 / 高圧物性 / 希土類強磁性 |
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| Outline of Final Research Achievements |
We have developed a miniature diamond anvll cell (DAC) without any system to adjust clearance between two anvils, which is suitable for magnetic measurements over wide temperature range from liquid helium temperature to room temperature. By using the DAC, we succeeded in measuring ac magnetization for lanthanoid ferromagnetic metals such as Gd, Tb, Dy, and Ho at pressures more than 20 GPa. The cirtical pressures, above which the magnetic orders disappear, were precisely evaluated, and they were compared with the results in previous literatures. In particular, we had to revise the information on critical pressures for Tb and Ho. Consequently we mention that the above critical pressures should not be determined from the data of electrical resistance. A seres of critical pressures was also discussed on the basis of structural phase transitions under pressures.
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| Academic Significance and Societal Importance of the Research Achievements |
“金属強磁性体の磁気秩序が高圧力下でどのようになるか？”は物質科学において重要な関心事である。例えば、鉄は10 GPa超の高圧力下で構造相転移に引きづられる形で強磁性状態が消失し、金属状態が超伝導状態にグレードアップする。ランタノイド系にも６種の強磁性元素が存在するが、高圧力下磁気測定から示唆された磁性状態と電気抵抗測定で主張されことが矛盾していた。今回、高圧力下磁気測定技術を向上させ、Gd-Hoの4元素に対して、信頼のおける磁気測定データを入手し、電位抵抗測定に頼らない形で磁性状態の温度・圧力相図を作成することが出来た。単一元素金属の物性ゆえに真相を明らかにしておく必要があった。
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Report
(4 results)
Research Products
(23 results)
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[Journal Article] Hydrostatic Compression Effects on Fifth-Group Element Superconductors V, Nb, and Ta Subjected to High-Pressure Torsion2019
Author(s)
M. Mito, S. Shigeoka, H. Kondo, N. Noumi, Y. Kitamura, K. Irie, K. Nakamura, S. Takagi, H. Deguchi, T. Tajiri, M. Ishizuka, T. Nishizaki, K. Edalati, Z. Horita
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Journal Title
MATERIALS TRANSACTIONS
Volume: 60
Issue: 8
Pages: 1472-1483
DOI
NAID
ISSN
1345-9678, 1347-5320
Year and Date
2019-08-01
Related Report
Peer Reviewed / Open Access
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[Journal Article] Hydrostatic pressure effects on superconducting transition of nanostructured niobium highly strained by high-pressure torsion2019
Author(s)
M. Mito, Y. Kitamura, T. Tajiri, K. Nakamura, R. Shiraishi, K. Ogata, H. Deguchi, T. Yamaguchi, N. Takeshita, T. Nishizaki, K. Edalati, Z. Horita
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Journal Title
Journal of Applied Physics
Volume: 125
Issue: 12
Pages: 125901-125901
DOI
NAID
Related Report
Peer Reviewed / Open Access
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