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From the NMR measurements, the temperature and field dependences of spin-lattice (T_1) and spin-spin relaxation times(T_2) were obtained. The value of Knight shift was also measured in enriched 195Pt metal. These measurements were also performed for the natural Pt metal thin wire which contains 33.8% 195Pt. Experimental results of the T_1 and Knight shift are same in both specimens. The T_2 in enriched sample is half of that in natural Pt specimen. This can be understood by the shorter distance among the nuclear spins in the enriched sample, resulting the stronger spin-spin interaction. But very interesting result is the field dependence of the T_2. We observed the four times larger field dependence of T_2 in the enriched sample than one in the natural Pt sample. At present we cannot explain this result.\nThe temperature dependence of the magnetization of the enriched 195Pt sample was measured by using a SQUID magnetometer. It shows rather large Curi-Weiss like temperature dependence. The similar temperature dependences of the magnetization were also observed in the 80% enriched l95Pt thin wire sample and also the natural Pt thin wire sample which was made by the same procedures as the enriched thin wire sample. The amount of the magnetization is proportional the number of the 195Pt nuclear spin. Curie-temperature was estimated to be 0.7K. The natural Pt metal thin wire made vy the ordinary method, did not show this large temperature dependence of the magnetization. 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Pt金属の核スピン・オーダーと量子ゆらぎの研究
https://doi.org/10.24517/00063526
https://doi.org/10.24517/0006352691161b0f-b8f2-4c8b-b387-0e04bc38dec1
名前 / ファイル | ライセンス | アクション |
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SC-PR-SUZUKI-H-kaken 2004-2p.pdf (101.7 kB)
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Item type | 報告書 / Research Paper(1) | |||||
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公開日 | 2021-08-26 | |||||
タイトル | ||||||
タイトル | Pt金属の核スピン・オーダーと量子ゆらぎの研究 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Study on Nuclear Spin Order and Quantum Fluctuation in Pt metal | |||||
言語 | ||||||
言語 | jpn | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_18ws | |||||
資源タイプ | research report | |||||
ID登録 | ||||||
ID登録 | 10.24517/00063526 | |||||
ID登録タイプ | JaLC | |||||
著者 |
鈴木, 治彦
× 鈴木, 治彦 |
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著者別表示 |
Suzuki, Haruhiko
× Suzuki, Haruhiko |
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提供者所属 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 金沢大学理学部 | |||||
書誌情報 |
平成14(2002)年度 科学研究費補助金 基盤研究(B) 研究概要 en : 2002 Research Rroject Summary 巻 2000 – 2002, p. 2p., 発行日 2004-04-13 |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | 濃縮^<195>Pt(97%)の試料について核スピン秩序の転移温度を見積もるためにNMRの測定によりスピンー格子緩和時間T_1、とスピンースピン緩和時間T_2の温度変化、磁場変化を求めた。さらにKnight shiftも測定した。また比較のために天然のPt(^<195>Ptが33.8%)についても同じ測定を行った。その結果T1についておよびKnight shiftは濃縮試料も天然のPt試料も同じ値を示した。それに対して、T_2は濃縮試料は天然の半分の短さであった。これは核スピン間の距離が短くなったため、核スピンー核スピン間の相互作用が強くなったと理解できる。さらにT_2には磁場依存性が有り、この磁場依存性がやはり濃縮試料の方が大きい。この磁場依存性については現在分からない。これまで求めたT_1、T_2の値から核スピン秩序転移の温度を求めると4.5μKとなった。 濃縮試料の磁化の温度変化をSQUIDで1.8K〜300Kの間で測定した。その結果Curie-Weiss型の温度変化を示した。この温度変化の原因を調べるために80%濃縮試料と濃縮試料と同じ方法で作られた天然の試料(33.8%)も同様に磁化測定をおこなった。その結果、磁化の大きさは195Ptの濃度に比例している。しかし通常の方法で作られた天然の試料についてはこのような大きな温度変化は観測されなかった。この温度変化から転移温度を見積もると0.7Kであった。この興味有る温度変化については今後とも研究する予定である。 |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | To estimate a nuclear spin ordering temperature in enriched 195Pt metal, NMR measurements were perfonned for the enriched 195Pt metal thin wire specimen. From the NMR measurements, the temperature and field dependences of spin-lattice (T_1) and spin-spin relaxation times(T_2) were obtained. The value of Knight shift was also measured in enriched 195Pt metal. These measurements were also performed for the natural Pt metal thin wire which contains 33.8% 195Pt. Experimental results of the T_1 and Knight shift are same in both specimens. The T_2 in enriched sample is half of that in natural Pt specimen. This can be understood by the shorter distance among the nuclear spins in the enriched sample, resulting the stronger spin-spin interaction. But very interesting result is the field dependence of the T_2. We observed the four times larger field dependence of T_2 in the enriched sample than one in the natural Pt sample. At present we cannot explain this result. The temperature dependence of the magnetization of the enriched 195Pt sample was measured by using a SQUID magnetometer. It shows rather large Curi-Weiss like temperature dependence. The similar temperature dependences of the magnetization were also observed in the 80% enriched l95Pt thin wire sample and also the natural Pt thin wire sample which was made by the same procedures as the enriched thin wire sample. The amount of the magnetization is proportional the number of the 195Pt nuclear spin. Curie-temperature was estimated to be 0.7K. The natural Pt metal thin wire made vy the ordinary method, did not show this large temperature dependence of the magnetization. We will investigate, the origin of this anomalous magnetic behavior in Pt metal. |
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内容記述 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 研究課題/領域番号:12440100, 研究期間(年度):2000 – 2002 | |||||
内容記述 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 出典:「Pt金属の核スピン・オーダーと量子ゆらぎの研究」研究成果報告書 課題番号12440100 (KAKEN:科学研究費助成事業データベース(国立情報学研究所)) (https://kaken.nii.ac.jp/ja/grant/KAKENHI-PROJECT-12440100/)を加工して作成 |
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著者版フラグ | ||||||
出版タイプ | AM | |||||
出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa | |||||
関連URI | ||||||
識別子タイプ | URI | |||||
関連識別子 | https://kaken.nii.ac.jp/ja/search/?kw=50004370 | |||||
関連名称 | https://kaken.nii.ac.jp/ja/search/?kw=50004370 | |||||
関連URI | ||||||
識別子タイプ | URI | |||||
関連識別子 | https://kaken.nii.ac.jp/ja/grant/KAKENHI-PROJECT-12440100/ | |||||
関連名称 | https://kaken.nii.ac.jp/ja/grant/KAKENHI-PROJECT-12440100/ |