Muroran-IT Academic Resources Archive Title Author(s) Citation Issue Date URL 構造依存希土類合金の開発と磁気熱量・熱弾性材料への 展開 雨海, 有佑; 塩尻, 泰広; 鈴木, 拓也; 石原, 圭; 村山, 茂幸 室蘭工業大学紀要 Vol.63, pp.37-40, 2014 2014-03-18 http://hdl.handle.net/10258/2828 Rights Type Journal Article See also Muroran-IT Academic Resources Archive Copyright Policy Muroran Institute of Technology ᐊᕤ⣖せ➨ 63 号（2013） ྕ㸦2013㸧37~40 37㹼40 室工大紀要第 63 特 集 ᵓ㐀౫Ꮡᕼᅵ㢮ྜ㔠ࡢ㛤Ⓨ☢Ẽ⇕㔞࣭⇕ᙎᛶᮦᩱࡢᒎ㛤 㞵ᾏ ᭷భ*1, *2㸪ሷᑼ Ὀᗈ*3㸪㕥ᮌ ᣅஓ*3㸪▼ཎ ᆂ*3㸪ᮧᒣ ⱱᖾ*1, *2 Development of Magnetocaloric and Thermoelastic Materials in Structure-dependent Rare-earth Alloys Yusuke AMAKAI*1, *2, Yasuhiro SHIOJIRI*3, Takuya SUZUKI*3 Kei ISHIHARA*3, and Shigeyuki MURAYAMA*1, *2 㸦ཎ✏ཷ᪥ ᖹᡂ 25 ᖺ 9 ᭶ 30 ᪥ ㄽᩥཷ⌮᪥ ᖹᡂ 26 ᖺ 1 ᭶ 24 ᪥㸧 Abstract This study aims to develop next-generation high-performance materials with utilizing the strongly correlated electronic properties in amorphous Ce-alloys. We have focused amorphous Ce-Mn alloys consisting of the rare-earth metal cerium and the transition metal manganese. We have measured the magnetostriction for amorphous Ce-Mn alloys where a large thermal expansion and anomalous temperature dependence observed. The thermal expansion of the low temperature for amorphous Ce-Mn alloys has been found to be controlled by a magnetic field. In the future, we aim at development of the drive actuator element under the control of the temperature and magnetic field. Keywords : Strongly correlated electron, Amorphous alloys, Thermal expansion, Magnetostriction 1 ࡣࡌࡵ ᡃࠎࡣ㸪ᕼᅵ㢮ඖ⣲ࡢࢭ࣒ࣜ࢘㸦Ce㸧ࢆྵ ࡴ㸪༢⤖ᬗࡽᵓ㐀つ๎㸦ࣔࣝࣇࢫ㸧࡞ ᕼᅵ㢮ඖ⣲ࢆྵࡴ㔠ᒓ㛫ྜ≀ࡸྜ㔠ࡣ㸪ᕼᅵ ࡢᵝࠎ࡞ᵓ㐀ࢆᣢࡘᕼᅵ㢮ྜ≀࠾ࡼࡧྜ㔠ࡢ㛤 㢮ࡢ㟁Ꮚࡀ≉ᐃࡢ㌶㐨㸦4f ㌶㐨㸧᮰⦡ࡉࢀࡿࡓ Ⓨ㟁Ꮚ≀ᛶࡘ࠸࡚◊✲ࢆ⾜ࡗ࡚ࡁࡓ㸬ࡇࢀࡲ ࡵᒁᅾᛶࡀᙉࡃ㸪㟁Ꮚྠኈࡢࢡ࣮ࣟࣥ┦స⏝ࡀ ࡛ࡢᡂᯝࡽ㸪ᙉ┦㛵㟁Ꮚࡀ㛵ࡋࡓᵝࠎ࡞㟁Ẽ ↓ど࡛ࡁ࡞࠸ࡓࡵ㸪ᙉ࠸㟁Ꮚ┦㛵㸦ᙉ┦㛵㟁Ꮚ≧ ఏᑟᛶࡸ⇕≉ᛶࢆぢฟࡋ࡚ࡁࡓࡀ㸪≉㸪ࣔࣝ ែ㸧ࢆᐇ⌧ࡍࡿ㸬ࡇࡢᙉ┦㛵㟁Ꮚ≧ែࡣ㸪ᕧ⇕ ࣇࢫ(a-)Ce ྜ㔠㛵ࡋ࡚㸪つ๎࡞ᵓ㐀࠾࠸࡚ ᐜ㔞࣭ወጁ࡞☢Ẽ┦㌿⛣࣭ᕧ☢Ẽᢠ࣭␗ᖖ⇕ ࡶᙉ┦㛵㟁Ꮚ≧ែࡀᐇ⌧ࡍࡿࡇࢆึࡵ࡚ぢฟࡋ ⭾ᙇ࣭⇕㟁ኚ≉ᛶ࣭㠀ᚑ᮶ᆺ㉸ఏᑟ࡞ከᙬ࡛ ࡓ㸬ࡑࡇ࡛㸪≉ࣔࣝࣇࢫྜ㔠ࢆ◊✲ᑐ㇟ 㨩ຊⓗ࡞≀ᛶࢆ♧ࡍࡇࡀ▱ࡽࢀ࡚࠸ࡿࠋࡇࢀࡽ ࡋ࡚㸪≀㉁㛤Ⓨࢆ⾜࠸᪂ࡓ࡞ᶵ⬟ᛶᮦᩱࡋ࡚ࡢ ࡢ≉ᛶࡣ㸪⤖ᬗᵓ㐀ࡸእሙ㸦☢ሙ࣭ ᗘ࣭ᅽຊ࣭ ྍ⬟ᛶࢆ᥈ࡗࡓ㸬ࣔࣝࣇࢫྜ㔠ࡢ◊✲ࡢⅬ 㟁ሙ➼㸧ࡼࡗ࡚ࡁࡃ≉ᛶࢆኚࡉࡏࡿ㸬ᚑࡗ ࡣ㸪ձ⤖ᬗྜ≀ࡋ࡚Ꮡᅾࡋ࡞࠸ඖ⣲ᵓᡂࡢྜ ࡚ᕼᅵ㢮ࢆྵࡴ㔠ᒓ㛫ྜ≀ࡸྜ㔠ࡣ㸪ࡕࡻࡗ 㔠స〇ࡀྍ⬟㸪ղ௵ពࡢ⤌ᡂẚ࡛ไᚚࡋࡓヨᩱస ࡋࡓࢳ࣮ࣗࢽࣥࢢࡼࡗ࡚᭷ᮃ࡞ḟୡ௦ࡢ㧗ᶵ⬟ 〇ࡀྍ⬟㸪ճ☢Ẽ␗᪉ᛶࡀ࡞࠸࡞ࡢ≉㛗ࢆᣢࡘ ᮦᩱࡋ࡚᭷ຊ࡞ྍ⬟ᛶࢆ⛎ࡵ࡚࠸ࡿ㸬 ࡓࡵ㸪≀㉁㛤Ⓨࡢ⮬⏤ᗘࡀ㠀ᖖ㧗࠸㸬ࡉࡽ㸪 ࣐ࢡࣟᆒ㉁࡞≉ᛶࡀᚓࡽࢀࡿࡇࡽ㸪ᮦᩱ≀ *1 ᐊ⹒ᕤᴗᏛ ࡋࡃࡳሗ⣔㡿ᇦ *2 ᐊ⹒ᕤᴗᏛ ⎔ቃㄪᮦᩱᕤᏛ◊✲ࢭࣥࢱ࣮ *3 ᐊ⹒ᕤᴗᏛ ᛂ⏝⌮Ꮫ⣔ᑓᨷ ᛶࡢほⅬࡽࡶ᭷࡛࠶ࡿゝ࠼ࡿ㸬ࡑࡇ࡛ᮏࢱ ࢫࢡࣇ࢛࣮ࢫ◊✲࡛ࡣ㸪ᕼᅵ㢮ඖ⣲ࡢ Ce ࢆ୰ᚰ ࡋࡓࣔࣝࣇࢫ࡞ࡢᵝࠎ࡞ᵓ㐀ࢆᣢࡘ㔠ᒓ㛫 - 37 － 37 － 㞵ᾏ ᭷భ㸪ሷᑼ Ὀᗈ㸪㕥ᮌ ᣅஓ㸪▼ཎ ᆂ㸪ᮧᒣ ⱱᖾ 㞵ᾏ ᭷భ㸪ሷᑼ Ὀᗈ㸪㕥ᮌ ᣅஓ㸪▼ཎ ᆂ㸪ᮧᒣ ⱱᖾ ྜ≀ࡸྜ㔠ࢆస〇ࡋ㸪ᇶ♏≀ᛶࡢホ౯ࡽḟୡ ௦ࡢ㧗ᶵ⬟ᕼᅵ㢮㔠ᒓᮦᩱࡋ࡚≉㸪ᴟప ྜ≀ࡸྜ㔠ࢆస〇ࡋ㸪ᇶ♏≀ᛶࡢホ౯ࡽḟୡ ࡽᐊ ⛬ᗘࡲ࡛⏝ ᗘᇦࢆព㆑ࡋࡓᮦᩱࡢᒎ ௦ࡢ㧗ᶵ⬟ᕼᅵ㢮㔠ᒓᮦᩱࡋ࡚≉㸪ᴟప 㛤ࢆ┠ᣦࡍࡇࢆ┠ⓗࡋࡓ㸬 ࡽᐊ ⛬ᗘࡲ࡛⏝ ᗘᇦࢆព㆑ࡋࡓᮦᩱࡢᒎ ࡇࢀࡲ࡛ Ce ᵝࠎ࡞ඖ⣲ࢆ⤌ࡳྜࢃࡏࡓࣔ 㛤ࢆ┠ᣦࡍࡇࢆ┠ⓗࡋࡓ㸬 ࣝࣇࢫ Ce ྜ㔠ࡀ࠸ࡃࡘస〇ࡉࢀ࡚࠸ࡿࡀ㸪 ࡑ ࡇࢀࡲ࡛ Ce ᵝࠎ࡞ඖ⣲ࢆ⤌ࡳྜࢃࡏࡓࣔ ࡢ୰࡛ࡶᡃࠎࡀୡ⏺࡛ึࡵ࡚స〇ࡋࡓ a-CexMn100-x ࣝࣇࢫ Ce ྜ㔠ࡀ࠸ࡃࡘస〇ࡉࢀ࡚࠸ࡿࡀ㸪 ࡑ ྜ㔠ࡣ㸪Ce Mn ࡢ 2 ඖ㔠ᒓ㛫ྜ≀ࡀᏑᅾࡋ࡞ ࡢ୰࡛ࡶᡃࠎࡀୡ⏺࡛ึࡵ࡚స〇ࡋࡓ a-CexMn100-x ࠸ࡓࡵ㸪ࣔࣝࣇࢫᵓ㐀ࡺ࠼Ꮡᅾྍ⬟࡞ྜ㔠 ྜ㔠ࡣ㸪Ce Mn ࡢ 2 ඖ㔠ᒓ㛫ྜ≀ࡀᏑᅾࡋ࡞ ࡛࠶ࡿ㸬ࡇࡢ a-Ce-Mn ྜ㔠ࡢᇶ♏≀ᛶ ᐃࢆ⾜ࡗ ࠸ࡓࡵ㸪ࣔࣝࣇࢫᵓ㐀ࡺ࠼Ꮡᅾྍ⬟࡞ྜ㔠 ࡓ㸬ࡑࡢ⤖ᯝ㸪a-Ce-Mn ྜ㔠ࡢ Ce ప⃰ᗘഃ࡛ࡣ㸪 ࡛࠶ࡿ㸬ࡇࡢ a-Ce-Mn ྜ㔠ࡢᇶ♏≀ᛶ ᐃࢆ⾜ࡗ ప ࡛ Mn ࣮࣓ࣔࣥࢺࡢ⤖ࡼࡿࢫࣆࣥࢢࣛࢫ ࡓ㸬ࡑࡢ⤖ᯝ㸪a-Ce-Mn ྜ㔠ࡢ Ce ప⃰ᗘഃ࡛ࡣ㸪 ┦ࡀฟ⌧ࡋࡓ㸬Ce ⃰ᗘ x ࡀቑຍࡍࡿ㸪ࢫࣆࣥࢢ ప ࡛ Mn ࣮࣓ࣔࣥࢺࡢ⤖ࡼࡿࢫࣆࣥࢢࣛࢫ ࣛࢫ㌿⛣ ᗘࡀῶᑡࡋ 60 ㏆࡛ᾘኻࡍࡿࠋCe ┦ࡀฟ⌧ࡋࡓ㸬Ce ⃰ᗘxx=ࡀቑຍࡍࡿ㸪ࢫࣆࣥࢢ 㧗⃰ᗘഃ࡛ࡣ㸪Ce ࡢ 4fx㟁Ꮚఏᑟ㟁Ꮚࡢΰᡂ㸦㏆ ࣛࢫ㌿⛣ ᗘࡀῶᑡࡋ = 60 ㏆࡛ᾘኻࡍࡿࠋCe ࢱ࣮ࢤࢵࢺྜ㔠⾲㠃ࡢ ྜ㔠 Ar+࢜ࣥࡀ⾪✺ࡋ㸪 ᅗ 1 ࢫࣃࢵࢱἲࡢᶍᘧᅗ ཎᏊࡀࡣࡌࡁฟࡉࢀࡿ㸬ࡣࡌࡁฟࡉࢀࡓཎᏊࡣ㸪 ྜ㔠 Ar+࢜ࣥࡀ⾪✺ࡋ㸪ࢱ࣮ࢤࢵࢺྜ㔠⾲㠃ࡢ ࢱ࣮ࢤࢵࢺྜ㔠┤ୖ࠶ࡿỈ෭ࡉࢀࡓ㖡ᇶᯈ⤖ ཎᏊࡀࡣࡌࡁฟࡉࢀࡿ㸬ࡣࡌࡁฟࡉࢀࡓཎᏊࡣ㸪 ᬗࡏࡎሁ✚ࡍࡿࡓࡵ㸪⤖ᬗᵓ㐀ࢆᣢࡓ࡞࠸ࣔ ࢱ࣮ࢤࢵࢺྜ㔠┤ୖ࠶ࡿỈ෭ࡉࢀࡓ㖡ᇶᯈ⤖ ࣝࣇࢫྜ㔠ࡀᚓࡽࢀࡿ㸦ᅗ 1㸧 㸬 ᬗࡏࡎሁ✚ࡍࡿࡓࡵ㸪⤖ᬗᵓ㐀ࢆᣢࡓ࡞࠸ࣔ ⸨ຠᯝ㸧ࢆ㏻ࡋ㸪ᕧ࡞⇕ᐜ㔞ࢆᣢࡘ㔜࠸㟁Ꮚ≧ 㧗⃰ᗘഃ࡛ࡣ㸪Ce ࡢ 4f 㟁Ꮚఏᑟ㟁Ꮚࡢΰᡂ㸦㏆ ែࡀᐇ⌧ࡍࡿ㸬ࡇࡢࡼ࠺㸪⤌ᡂࡢኚకࡗ࡚ ⸨ຠᯝ㸧ࢆ㏻ࡋ㸪ᕧ࡞⇕ᐜ㔞ࢆᣢࡘ㔜࠸㟁Ꮚ≧ (1-4) ≉ᛶࡀ㐃⥆ⓗኚࡍࡿࡇࡀࢃࡗࡓ㸬 ࡇࡢ ែࡀᐇ⌧ࡍࡿ㸬ࡇࡢࡼ࠺㸪⤌ᡂࡢኚకࡗ࡚ ྜ㔠࠾࠸࡚≉⯆῝࠸ᛶ㉁ࡣ㸪⇕⭾ᙇ࡛࠶ࡿ㸬 (1-4) ≉ᛶࡀ㐃⥆ⓗኚࡍࡿࡇࡀࢃࡗࡓ㸬 ࡇࡢ a-Ce-Mn ྜ㔠ࡢ⇕⭾ᙇࡣ㸪ᖜᗈ࠸⤌ᡂ⠊ᅖ࣭ ᗘ ྜ㔠࠾࠸࡚≉⯆῝࠸ᛶ㉁ࡣ㸪⇕⭾ᙇ࡛࠶ࡿ㸬 ⠊ᅖ࡛㏻ᖖ㔠ᒓࡼࡾᕧ࡛࠶ࡾ㸪≉⤌ᡂࡀᣕᢠ a-Ce-Mn ྜ㔠ࡢ⇕⭾ᙇࡣ㸪ᖜᗈ࠸⤌ᡂ⠊ᅖ࣭ ᗘ ࡍࡿ x = 50 ࡛ࡣ㸪ᐊ ㏆࡛㖡ࡢಸ௨ୖࡢ⇕⭾ᙇ ⠊ᅖ࡛㏻ᖖ㔠ᒓࡼࡾᕧ࡛࠶ࡾ㸪≉⤌ᡂࡀᣕᢠ ಀᩘࡀほ ࡉࢀࡿࡶ㸪ప ࡛⇕⭾ᙇಀᩘࡀ ࡍࡿ x = 50 ࡛ࡣ㸪ᐊ ㏆࡛㖡ࡢಸ௨ୖࡢ⇕⭾ᙇ ቑࡍࡿወጁ࡞ ᗘ౫Ꮡᛶࡀほ ࡉࢀࡓ㸬ࡑࡇ࡛㸪 ಀᩘࡀほ ࡉࢀࡿࡶ㸪ప ࡛⇕⭾ᙇಀᩘࡀ ᮏࢱࢫࢡࡢ◊✲ㄢ㢟ࡋ࡚ࡲࡎ㸪a-Ce-Mn ྜ㔠ࡢ ቑࡍࡿወጁ࡞ ᗘ౫Ꮡᛶࡀほ ࡉࢀࡓ㸬ࡑࡇ࡛㸪 ␗ᖖ࡞⇕⭾ᙇࢆゎ᫂ࡋ㸪ࢡࢳ࢚࣮ࣗࢱ࣮⣲Ꮚ࡞ ᮏࢱࢫࢡࡢ◊✲ㄢ㢟ࡋ࡚ࡲࡎ㸪a-Ce-Mn ྜ㔠ࡢ ࡢ⇕⭾ᙇࢆάࡋࡓᮦᩱ㛤Ⓨᒎ㛤ࡍࡿࡇࢆ ␗ᖖ࡞⇕⭾ᙇࢆゎ᫂ࡋ㸪ࢡࢳ࢚࣮ࣗࢱ࣮⣲Ꮚ࡞ ࡲࡓ㸪ᮏ◊✲࡛ࡣ㸪ࢫࣃࢵࢱ⏝ࡍࡿࢱ࣮ࢤ ࣝࣇࢫྜ㔠ࡀᚓࡽࢀࡿ㸦ᅗ 1㸧 㸬 ࢵࢺྜ㔠ࢆࣔࣀ࣮ࢡ⁐ゎࡼࡗ࡚స〇ࡋ࡚࠸ࡿ㸬 ࡲࡓ㸪ᮏ◊✲࡛ࡣ㸪ࢫࣃࢵࢱ⏝ࡍࡿࢱ࣮ࢤ ࢱ࣮ࢤࢵࢺྜ㔠ࢆ௵ពࡢ⤌ᡂẚ࡛స〇ࡍࡿࡇ࡛ ࢵࢺྜ㔠ࢆࣔࣀ࣮ࢡ⁐ゎࡼࡗ࡚స〇ࡋ࡚࠸ࡿ㸬 ࠾࠾ࡼࡑᚲせࡍࡿ⤌ᡂẚࡢࣔࣝࣇࢫྜ㔠ࢆ ࢱ࣮ࢤࢵࢺྜ㔠ࢆ௵ពࡢ⤌ᡂẚ࡛స〇ࡍࡿࡇ࡛ స〇ࡍࡿࡇࡀ࡛ࡁࡿࠋᚓࡽࢀࡓࣔࣝࣇࢫྜ ࠾࠾ࡼࡑᚲせࡍࡿ⤌ᡂẚࡢࣔࣝࣇࢫྜ㔠ࢆ 㔠ࡣ㸪ᶵᲔⓗ◊☻࡛㖡ᇶᯈࢆ㝖ཤࡋ㸪ྛ✀≀ᛶ స〇ࡍࡿࡇࡀ࡛ࡁࡿࠋᚓࡽࢀࡓࣔࣝࣇࢫྜ ᐃ⏝ࢲࣔࣥࢻ࢝ࢵࢱ࣮࡛ᡂᙧࡋࡓ㸬 㔠ࡣ㸪ᶵᲔⓗ◊☻࡛㖡ᇶᯈࢆ㝖ཤࡋ㸪ྛ✀≀ᛶ ᐃ⏝ࢲࣔࣥࢻ࢝ࢵࢱ࣮࡛ᡂᙧࡋࡓ㸬 2㸬2 ヨᩱホ౯࠾ࡼࡧ≀ᛶ ᐃ ヨᩱࡢᵓ㐀ࡣ㸪 X ⥺ᅇᢡ ᐃࡼࡗ࡚☜ㄆࡋࡓ㸬 2㸬2 ヨᩱホ౯࠾ࡼࡧ≀ᛶ ᐃ ⤌ᡂࡣ㸪ICP Ⓨගศගศᯒἲ࠾ࡼࡧ SEM-EDS ࡞ ヨᩱࡢᵓ㐀ࡣ㸪 X ⥺ᅇᢡ ᐃࡼࡗ࡚☜ㄆࡋࡓ㸬 ┠ᣦࡋࡓ㸬ᅇࡣ㸪⇕⭾ᙇ⇕ຊᏛⓗ㛵㐃ࡍࡿ ࡢ⇕⭾ᙇࢆάࡋࡓᮦᩱ㛤Ⓨᒎ㛤ࡍࡿࡇࢆ ẚ⇕㸪⇕⭾ᙇᑐࡍࡿ☢ሙࡢຠᯝࢆ⤂ࡍࡿ㸬 ┠ᣦࡋࡓ㸬ᅇࡣ㸪⇕⭾ᙇ⇕ຊᏛⓗ㛵㐃ࡍࡿ ࢆ⏝࠸࡚☜ㄆࡋࡓ㸬 ⤌ᡂࡣ㸪ICP Ⓨගศගศᯒἲ࠾ࡼࡧ SEM-EDS ࡞ ≀ᛶ ᐃࡣ㸪☢⋡㸪㟁Ẽᢠ㸪ẚ⇕㸪⇕⭾ᙇ ࢆ⏝࠸࡚☜ㄆࡋࡓ㸬 ẚ⇕㸪⇕⭾ᙇᑐࡍࡿ☢ሙࡢຠᯝࢆ⤂ࡍࡿ㸬 2 ᐇ㦂 2㸬1 ヨᩱస〇 ᅗ 1 ࢫࣃࢵࢱἲࡢᶍᘧᅗ ࠾ࡼࡧ⇕㟁⬟ࡢ ᗘ౫Ꮡᛶࢆ୰ᚰ⾜࠸㸪ࡑࡢ☢ ≀ᛶ ᐃࡣ㸪☢⋡㸪㟁Ẽᢠ㸪ẚ⇕㸪⇕⭾ᙇ Ẽⓗᛶ㉁㸪ఏᑟ≉ᛶ㸪⇕≉ᛶ࡞ࡽ㟁Ꮚ≧ែ ࠾ࡼࡧ⇕㟁⬟ࡢ ᗘ౫Ꮡᛶࢆ୰ᚰ⾜࠸㸪ࡑࡢ☢ 2 ᐇ㦂 ヨᩱࡣ㸪DC 2㸬1 ヨᩱస〇㧗㏿ࢫࣃࢵࢱἲࢆ⏝࠸࡚స〇ࡋࡓ㸬 ࢫࣃࢵࢱἲࡣ㸪༙ᑟయⷧ⭷ࡸ㔠ᒓⷧ⭷ࡢస〇ἲ ヨᩱࡣ㸪DC 㧗㏿ࢫࣃࢵࢱἲࢆ⏝࠸࡚స〇ࡋࡓ㸬 ࡢࡦࡘࡋ࡚Ⰻࡃ▱ࡽࢀࡓ᪉ἲ࡛࠶ࡿ㸬ᮏ◊✲ ࢫࣃࢵࢱἲࡣ㸪༙ᑟయⷧ⭷ࡸ㔠ᒓⷧ⭷ࡢస〇ἲ ࡛⏝࠸࡚࠸ࡿ DC 㧗㏿ࢫࣃࢵࢱἲࡣ㸪ẚ㍑ⓗ㠃✚ ࡢࡦࡘࡋ࡚Ⰻࡃ▱ࡽࢀࡓ᪉ἲ࡛࠶ࡿ㸬ᮏ◊✲ ࠸ࡓ㸬ࢫࢺࣞࣥࢤ࣮ࢪἲࡣ㸪㔠ᒓ⟩࡛ฟ᮶ࡓ ⇕⭾ᙇࡢ ᐃ᪉ἲࡣ㸪ࢫࢺࣞࣥࢤ࣮ࢪἲࢆ⏝ ṍࡳࢤ࣮ࢪࡢ㟁Ẽᢠࡢኚࡀṍࡳࡢ㔞ẚࡍ ࠸ࡓ㸬ࢫࢺࣞࣥࢤ࣮ࢪἲࡣ㸪㔠ᒓ⟩࡛ฟ᮶ࡓ ࡿࡇࢆ⏝ࡋࡓṍࡳࡢ ᐃἲ࡛࠶ࡿ㸬௨๓ࡲ࡛ ṍࡳࢤ࣮ࢪࡢ㟁Ẽᢠࡢኚࡀṍࡳࡢ㔞ẚࡍ ࡣ㸪ᴟప ෭⨨ࢆ⏝࠸࡚㸪10 K ࡽᐊ ⛬ᗘ ࡿࡇࢆ⏝ࡋࡓṍࡳࡢ ᐃἲ࡛࠶ࡿ㸬௨๓ࡲ࡛ ࡘཌ࠸⭷(mm ࣮࢜ࢲ࣮)ࡢ㔠ᒓヨᩱస〇ࡀྍ⬟࡞ ࡛⏝࠸࡚࠸ࡿ DC 㧗㏿ࢫࣃࢵࢱἲࡣ㸪ẚ㍑ⓗ㠃✚ ࡓࡵ㸪୍ᗘࡢヨᩱస〇࡛ᵝࠎ࡞≀ᛶ ᐃࢆ⾜࠺ࡇ ࡘཌ࠸⭷(mm ࣮࢜ࢲ࣮)ࡢ㔠ᒓヨᩱస〇ࡀྍ⬟࡞ ࡢ ᗘ⠊ᅖ࡛↓☢ሙࡢ ᐃࢆ⾜ࡗ࡚࠸ࡓࠋࡋࡋ㸪 ࡣ㸪ᴟప ෭⨨ࢆ⏝࠸࡚㸪10 K ࡽᐊ ⛬ᗘ ࡇࡢ᪉ἲࡢḞⅬࡋ࡚㸪ప ᇦࡢ ᗘᏳᐃᛶ ࡢ ᗘ⠊ᅖ࡛↓☢ሙࡢ ᐃࢆ⾜ࡗ࡚࠸ࡓࠋࡋࡋ㸪 ࡀฟ᮶ࡿ㸬 DC 㧗㏿ࢫࣃࢵࢱἲࡼࡿࣔࣝࣇ ࡓࡵ㸪୍ᗘࡢヨᩱస〇࡛ᵝࠎ࡞≀ᛶ ᐃࢆ⾜࠺ࡇ ࢫྜ㔠ࡢస〇ࣉࣟࢭࢫࡣ㸪ࡲࡎ㸪పᅽࡢ Ar ࢞ࢫ㞺 ࡀฟ᮶ࡿ㸬DC 㧗㏿ࢫࣃࢵࢱἲࡼࡿࣔࣝࣇ ᅖẼ୰ࡢࢳࣕࣥࣂ࣮ෆ㸪ᑐྥࡋ࡚㓄⨨ࡉࢀࡓࣇ ࢫྜ㔠ࡢస〇ࣉࣟࢭࢫࡣ㸪ࡲࡎ㸪పᅽࡢ Ar ࢞ࢫ㞺 ࡽࡢ≀ᛶ ᐃᑐࡋ㧗࠸ ᗘ࡛ࡢ ᐃ࡞ࡗ࡚ ࡇࡢ᪉ἲࡢḞⅬࡋ࡚㸪ప ᇦࡢ ᗘᏳᐃᛶ ࠸ࡓࡇ↓☢ሙ࡛ࡢ ᐃࡋฟ᮶࡞࠸ࡇࡀᣲ ࡽࡢ≀ᛶ ᐃᑐࡋ㧗࠸ ᗘ࡛ࡢ ᐃ࡞ࡗ࡚ ࣓ࣛࣥࢺ㟁ᴟࣀ࣮ࢻ㟁ᴟ㛫㟁ᅽࢆࡅ㸪 ᅖẼ୰ࡢࢳࣕࣥࣂ࣮ෆ㸪ᑐྥࡋ࡚㓄⨨ࡉࢀࡓࣇ ࢢ࣮ࣟᨺ㟁ࡼࡗ࡚ Ar ࢞ࢫࢆ㝧࢜ࣥࡉࡏࡿ㸬 ࣓ࣛࣥࢺ㟁ᴟࣀ࣮ࢻ㟁ᴟ㛫㟁ᅽࢆࡅ㸪 ࡑࡢᚋ㸪ࢱ࣮ࢤࢵࢺ㟁ᴟ㈇ࡢ㧗㟁ᅽࢆࡅࡿࡇ ࢢ࣮ࣟᨺ㟁ࡼࡗ࡚ Ar ࢞ࢫࢆ㝧࢜ࣥࡉࡏࡿ㸬 ࡛㸪ࢱ࣮ࢤࢵࢺ㟁ᴟୖ㓄⨨ࡉࢀࡓࢱ࣮ࢤࢵࢺ ࡑࡢᚋ㸪ࢱ࣮ࢤࢵࢺ㟁ᴟ㈇ࡢ㧗㟁ᅽࢆࡅࡿࡇ ࡛㸪ࢱ࣮ࢤࢵࢺ㟁ᴟୖ㓄⨨ࡉࢀࡓࢱ࣮ࢤࢵࢺ ࡘ࠸࡚⪃ᐹࡋࡓ㸬 Ẽⓗᛶ㉁㸪ఏᑟ≉ᛶ㸪⇕≉ᛶ࡞ࡽ㟁Ꮚ≧ែ ⇕⭾ᙇࡢ ᐃ᪉ἲࡣ㸪ࢫࢺࣞࣥࢤ࣮ࢪἲࢆ⏝ ࡘ࠸࡚⪃ᐹࡋࡓ㸬 ࡆࡽࢀࡿ㸬ࡑࡇ࡛ᮏ◊✲࡛ࡣ㸪 ᗘ☢ሙࡢࢥࣥ ࠸ࡓࡇ↓☢ሙ࡛ࡢ ᐃࡋฟ᮶࡞࠸ࡇࡀᣲ ࢺ࣮ࣟࣝࡀ⡆౽⾜࠼ࡿᮏᏛᡤ᭷ࡢ≀⌮≉ᛶホ౯ ࡆࡽࢀࡿ㸬ࡑࡇ࡛ᮏ◊✲࡛ࡣ㸪 ᗘ☢ሙࡢࢥࣥ ⨨ PPMS㸦Quantum Deign ♫㸧ࢆ⏝ࡋ࡚㸪☢ሙ ࢺ࣮ࣟࣝࡀ⡆౽⾜࠼ࡿᮏᏛᡤ᭷ࡢ≀⌮≉ᛶホ౯ ୰⇕⭾ᙇ ᐃࢩࢫࢸ࣒ࢆᵓ⠏ࡋࡓ㸬 ⌧ᅾ㸪5 ~ 300 K ⨨ PPMS㸦Quantum Deign ♫㸧ࢆ⏝ࡋ࡚㸪☢ሙ ࡢ ᗘ⠊ᅖ࡛ ᗘ୍ᐃࡢୗ㸪☢ሙࢆኚࡉࡏࡓ ୰⇕⭾ᙇ ᐃࢩࢫࢸ࣒ࢆᵓ⠏ࡋࡓ㸬⌧ᅾ㸪5 ~ 300 K - 38 - ࡢ ᗘ⠊ᅖ࡛ ᗘ୍ᐃࡢୗ㸪☢ሙࢆኚࡉࡏࡓ - 38 - － 38 － ᵓ㐀౫Ꮡᕼᅵ㢮ྜ㔠ࡢ㛤Ⓨ☢Ẽ⇕㔞࣭⇕ᙎᛶᮦᩱࡢᒎ㛤 ᵓ㐀౫Ꮡᕼᅵ㢮ྜ㔠ࡢ㛤Ⓨ☢Ẽ⇕㔞࣭⇕ᙎᛶᮦᩱࡢᒎ㛤 ᅗ 2 x = 50 ࡢẚ⇕ࡢ ᗘ౫Ꮡᛶ ᅗ 3 ࡢṍࡳࡢ ᐃࡀྍ⬟࡞☢ṍ ᐃࢩࢫࢸ࣒ࡢᵓ⠏ ᅗ 2 x = 50 ࡢẚ⇕ࡢ ᗘ౫Ꮡᛶ ᡂຌࡋࡓ㸬ᅇࡣ㸪ᐊ ࡽప ࡲ࡛ᕧ࡞⇕⭾ ࡢṍࡳࡢ ᐃࡀྍ⬟࡞☢ṍ ᐃࢩࢫࢸ࣒ࡢᵓ⠏ ᅗ 3 a-Ce-Mn ྜ㔠ࡢ⥺⭾ᙇL/L ࡢ ᗘ౫Ꮡᛶ a-Ce-Mn ྜ㔠ࡢ⥺⭾ᙇL/L ࡢ ᗘ౫Ꮡᛶ ᙇࡀほ ࡉࢀࡿ x = 50 ࡢヨᩱᑐࡋ☢ṍ ᐃࢆ⾜ ᡂຌࡋࡓ㸬ᅇࡣ㸪ᐊ ࡽప ࡲ࡛ᕧ࡞⇕⭾ ࡗࡓ㸬 ᐃ ᗘࡣ㸪5 20 K, 50 K, 80 K, 100 K, ᙇࡀほ ࡉࢀࡿ x = 50K,ࡢヨᩱᑐࡋ☢ṍ ᐃࢆ⾜ 150 K, 200 K, 275 K, 300 60 K, kOe ࡲ࡛ ࡗࡓ㸬 ᐃ ᗘࡣ㸪5 K,K㸪☢ሙࢆ 20 K, 50 0K,~80 100 K, ኚࡉࡏ࡚☢ሙ᪉ྥᑐࡍࡿṍࡳࡢ ᐃࢆ⾜ࡗࡓ㸬 150 K, 200 K, 275 K, 300 K㸪☢ሙࢆ 0 ~ 60 kOe ࡲ࡛ ኚࡉࡏ࡚☢ሙ᪉ྥᑐࡍࡿṍࡳࡢ ᐃࢆ⾜ࡗࡓ㸬 3 ⤖ᯝ⪃ᐹ 3 ⤖ᯝ⪃ᐹ 3㸬1 ẚ⇕ ᅗ2 x = 50 ࡢẚ⇕ࡢ ᗘ౫Ꮡᛶࢆ♧ࡍ㸬୍⯡ 3㸬1 ẚ⇕ ☢ᛶయࡢẚ⇕ࡣ㸪᱁Ꮚẚ⇕ Cph ☢Ẽẚ⇕ Cmag ᅗ 2 x = 50 ࡢẚ⇕ࡢ ᗘ౫Ꮡᛶࢆ♧ࡍ㸬୍⯡ 㟁Ꮚẚ⇕ Cel ࡢ࡛ほ ࡉࢀࡿ㸬ᐇ㦂࡛ᚓࡽࢀࡓ ☢ᛶయࡢẚ⇕ࡣ㸪᱁Ꮚẚ⇕ Cph ☢Ẽẚ⇕ Cmag ࢹ࣮ࢱᑐࡋ㸪㐺ᙜ࡞ࢹࣂ ᗘࢆỴࡵ㸪ࢹࣂ 㟁Ꮚẚ⇕ C ࡢ࡛ほ ࡉࢀࡿ㸬ᐇ㦂࡛ᚓࡽࢀࡓ ᅗ 4 el 㛵ᩘࡼࡗ࡚ Cph ࡢᐤࢆぢ✚ࡶࡗࡓ㸬ࢹࣂ ᗘ ࢹ࣮ࢱᑐࡋ㸪㐺ᙜ࡞ࢹࣂ ᗘࢆỴࡵ㸪ࢹࣂ ࡣ㸪x = 50 ࡛ 300 ࡋࡓ㸬ࡉࡽ㸪ᚓࡽࢀࡓẚ⇕ 㛵ᩘࡼࡗ࡚ C K ࡢᐤࢆぢ✚ࡶࡗࡓ㸬 ࢹࣂ ᗘ ph ࡽ ࡣ㸪x C = ph50ࢆᘬࡃࡇ࡛☢Ẽ࠾ࡼࡧ㟁Ꮚࡢᐤࢆぢ ࡛ 300 K ࡋࡓ㸬ࡉࡽ㸪ᚓࡽࢀࡓẚ⇕ ✚ࡶࡗࡓ㸬㧗 ഃࡢẚ⇕ࡣ㸪ぢ✚ࡶࡗࡓ Cph ᐇ㦂 ࡽ C ࢆᘬࡃࡇ࡛☢Ẽ࠾ࡼࡧ㟁Ꮚࡢᐤࢆぢ ph ್ࡀࡰ୍⮴ࡍࡿࡇࡽ㸪᱁Ꮚẚ⇕ࡢᐤࡢࡳ ✚ࡶࡗࡓ㸬㧗 ഃࡢẚ⇕ࡣ㸪ぢ✚ࡶࡗࡓ Cph ᐇ㦂 ࡛ㄝ࡛᫂ࡁࡿࡶࡋࢀ࡞࠸㸬150 K ௨ୗࡢప ࡛㸪 ್ࡀࡰ୍⮴ࡍࡿࡇࡽ㸪᱁Ꮚẚ⇕ࡢᐤࡢࡳ ☢Ẽ࠾ࡼࡧ㟁Ꮚẚ⇕ࡢᐤࡀ⌧ࢀ㸪40 ~ 50 K ㏆ ࡛ㄝ࡛᫂ࡁࡿࡶࡋࢀ࡞࠸㸬150 K ௨ୗࡢప ࡛㸪 ᒣࢆᣢࡘ㸬ప ẚ⇕ࡼࡾぢ✚ࡶࡽࢀࡓ㟁Ꮚẚ⇕ ☢Ẽ࠾ࡼࡧ㟁Ꮚẚ⇕ࡢᐤࡀ⌧ࢀ㸪40 ~ 50 K ㏆ ಀᩘ ࡣ㸪x = 50 ࡛ 95.5 mJ/molK2 ㏻ᖖ㔠ᒓẚ ᒣࢆᣢࡘ㸬ప ẚ⇕ࡼࡾぢ✚ࡶࡽࢀࡓ㟁Ꮚẚ⇕ ࡚࠾ࡼࡑ ಸࡶࡁ࠸㸬 ಀᩘࡣ㸪x100 = 50 ࡛ 95.5 mJ/molK2 ㏻ᖖ㔠ᒓẚ ࡚࠾ࡼࡑ 100 ಸࡶࡁ࠸㸬 3㸬2 ⇕⭾ᙇ ᅗ 3 a-Ce-Mn ྜ㔠ࡢ⥺⭾ᙇL/L ࡢ ᗘ౫Ꮡᛶ 3㸬2 ⇕⭾ᙇ ࢆ♧ࡍ㸬ẚ㍑ࡢࡓࡵ㸪Cu ࡢ⥺⭾ᙇࡢ ᗘ౫Ꮡᛶࡶ ᅗ 3 a-Ce-Mn ྜ㔠ࡢ⥺⭾ᙇL/L ࡢ ᗘ౫Ꮡᛶ ♧ࡍ㸬L/L ࡣ㸪ࡍ࡚ࡢ⤌ᡂ࠾࠸࡚ Cu ẚ㍑ ࢆ♧ࡍ㸬ẚ㍑ࡢࡓࡵ㸪Cu ࡢ⥺⭾ᙇࡢ ᗘ౫Ꮡᛶࡶ ࡋ࡚ࡁ࠸ ᗘ౫Ꮡࢆ♧ࡍ㸬Ce ప⃰ᗘഃ࡛㏻ᖖ㔠 ♧ࡍ㸬L/L ࡣ㸪ࡍ࡚ࡢ⤌ᡂ࠾࠸࡚ Cu ẚ㍑ ᒓྠᵝ ᗘࡢῶᑡࡶୗฝࡢ ᗘ౫Ꮡࢆ ࡋ࡚ࡁ࠸ ᗘ౫Ꮡࢆ♧ࡍ㸬Ce ప⃰ᗘഃ࡛㏻ᖖ㔠 ♧ࡍ㸬Ce ⃰ᗘ 50 at%௨ୖ࡛ࡣ㸪100 K ㏆ࡲ࡛⥺ ᒓྠᵝ ᗘࡢῶᑡࡶୗฝࡢ ᗘ౫Ꮡࢆ ᙧⓗ࡞ῶᑡࢆ♧ࡋ㸪ࡑࡢᚋୖฝࡢ ᗘ౫Ꮡࢆ♧ ♧ࡍ㸬Ce ⃰ᗘ 50 at%௨ୖ࡛ࡣ㸪100 K ㏆ࡲ࡛⥺ ᙧⓗ࡞ῶᑡࢆ♧ࡋ㸪ࡑࡢᚋୖฝࡢ ᗘ౫Ꮡࢆ♧ a-Ce-Mn ྜ㔠ࡢ⇕⭾ᙇಀᩘࡢ ᗘ౫Ꮡᛶ a-Ce-Mn ྜ㔠ࡢ⇕⭾ᙇಀᩘࡢ ᅗ 4 ࡢ ᗘ౫Ꮡ ࡍ㸬ᅗ 4 a-Ce-Mn ྜ㔠ࡢ⇕⭾ᙇಀᩘ ᗘ౫Ꮡᛶ ᛶࢆ♧ࡍ㸬ࡣ㸪Ce ⃰ᗘ 50 at%௨ୗࡢ㧗 ഃ࡛㏻ ࡍ㸬ᅗ 4 a-Ce-Mn ྜ㔠ࡢ⇕⭾ᙇಀᩘࡢ ᗘ౫Ꮡ ᖖ㔠ᒓẚ 2㹼3 ಸࡶࡢ್ࢆ♧ࡍ㸬ࡲࡓ㸪50 at% ⃰ᗘ 50 at%௨ୗࡢ㧗 ഃ࡛㏻ ᛶࢆ♧ࡍ㸬ࡣ㸪Ce ௨ୖ࡛ࡣ㸪ᖜᗈ࠸ ᗘ㡿ᇦ࡛ᕧ࡞್ࢆ♧ࡍ㸬100 ᖖ㔠ᒓẚ 2㹼3 ಸࡶࡢ್ࢆ♧ࡍ㸬ࡲࡓ㸪50 at% K ௨ୗࡢప ഃ࡛ࡣ㸪 ᗘࡢῶᑡࡶࡁ࡞ ௨ୖ࡛ࡣ㸪ᖜᗈ࠸ ᗘ㡿ᇦ࡛ᕧ࡞್ࢆ♧ࡍ㸬100 ቑࢆ♧ࡋ㸪ࡑࡢᚋࣆ࣮ࢡࢆᣢࡗ࡚ࡁࡃῶᑡࡍ K ௨ୗࡢప ഃ࡛ࡣ㸪 ᗘࡢῶᑡࡶࡁ࡞ ࡢቑࡣ㸪☢Ẽẚ⇕ࡢቑ࠾࠾ࡼࡑ ࡿ㸬ప ࡢ ቑࢆ♧ࡋ㸪ࡑࡢᚋࣆ࣮ࢡࢆᣢࡗ࡚ࡁࡃῶᑡࡍ ୍⮴ࡋ࡚࠸ࡿ㸬ࡇࡢቑࡣ㸪a-(Ce,Y)-Mn ྜ㔠ࡢ◊ ࡿ㸬ప ࡢࡢቑࡣ㸪☢Ẽẚ⇕ࡢቑ࠾࠾ࡼࡑ (5) ✲ ࡽ㸪㏆⸨ຠᯝࡼࡿࡶࡢ⪃࠼ࡽࢀ࡚࠸ࡿ㸬 ୍⮴ࡋ࡚࠸ࡿ㸬ࡇࡢቑࡣ㸪a-(Ce,Y)-Mn ྜ㔠ࡢ◊ (5) 5 a-Ce-Mn ྜ㔠ࡢ☢ṍࡢ☢ሙ౫Ꮡᛶࢆ♧ࡍ㸬 ࡽ㸪㏆⸨ຠᯝࡼࡿࡶࡢ⪃࠼ࡽࢀ࡚࠸ࡿ㸬 ✲ᅗ ࡍ࡚ࡢ ᗘ࠾࠸࡚㸪㈇ࡢ☢ṍࡀほ ࡉࢀࡓ㸬 ᅗ 5 a-Ce-Mn ྜ㔠ࡢ☢ṍࡢ☢ሙ౫Ꮡᛶࢆ♧ࡍ㸬 ࡇࢀࡣ☢ሙࡼࡗ࡚⇕⭾ᙇࡀᢚไࡉࢀࡓࡇࢆ♧ ࡍ࡚ࡢ ᗘ࠾࠸࡚㸪㈇ࡢ☢ṍࡀほ ࡉࢀࡓ㸬 ࡋ࡚࠸ࡿ㸬ࡲࡓ㸪㧗 ࣭ప☢ሙ࡛ࡣ㸪☢ሙ ࡇࢀࡣ☢ሙࡼࡗ࡚⇕⭾ᙇࡀᢚไࡉࢀࡓࡇࢆ♧ ࢇ౫Ꮡࡋ࡞࠸ࡀ㸪ప ࣭㧗☢ሙࡁ࡞☢ሙ ࡋ࡚࠸ࡿ㸬ࡲࡓ㸪㧗 ࣭ప☢ሙ࡛ࡣ㸪☢ሙ ౫Ꮡᛶࡀほ ࡉࢀࡓ㸬ᅗ 6 a-Ce-Mn ྜ㔠ࡢ☢ṍ ࢇ౫Ꮡࡋ࡞࠸ࡀ㸪ప ࣭㧗☢ሙࡁ࡞☢ሙ ࡢ ᗘ౫Ꮡᛶࢆ♧ࡍ㸬ప☢ሙഃ࡛ࡣ㸪ࢇ ౫Ꮡᛶࡀほ ࡉࢀࡓ㸬ᅗ 6 a-Ce-Mn ྜ㔠ࡢ☢ṍ ᗘ౫Ꮡࡋ࡞࠸ࡢᑐࡋ㸪30 kOe ௨ୖࡢ☢ሙ࡛㸪 ࡢ ᗘ౫Ꮡᛶࢆ♧ࡍ㸬ప☢ሙഃ࡛ࡣ㸪ࢇ 100 K ௨ୗࡢప ࡛ ᗘࡢῶᑡࡶࡁࡃῶ ᗘ౫Ꮡࡋ࡞࠸ࡢᑐࡋ㸪30 kOe ௨ୖࡢ☢ሙ࡛㸪 100 K ௨ୗࡢప ࡛ ᗘࡢῶᑡࡶࡁࡃῶ - 39 - 39 - － 39 － 㞵ᾏ ᭷భ㸪ሷᑼ Ὀᗈ㸪㕥ᮌ ᣅஓ㸪▼ཎ ᆂ㸪ᮧᒣ ⱱᖾ 㞵ᾏ ᭷భ㸪ሷᑼ Ὀᗈ㸪㕥ᮌ ᣅஓ㸪▼ཎ ᆂ㸪ᮧᒣ ⱱᖾ ṍࡀほ ࡉࢀࡓ㸬ᚑࡗ࡚㸪ప ࡛ࡢ⇕⭾ᙇࡢቑ ࡣ☢ሙࡼࡗ࡚ไᚚ࡛ࡁࡿࡇࡀࢃࡗࡓ㸬 ṍࡀほ ࡉࢀࡓ㸬ᚑࡗ࡚㸪ప ࡛ࡢ⇕⭾ᙇࡢቑ ᚋࡣ㸪☢ṍࡔࡅ࡛࡞ࡃ⇕⭾ᙇࡢ☢ሙ୰ࡢ ᗘ ࡣ☢ሙࡼࡗ࡚ไᚚ࡛ࡁࡿࡇࡀࢃࡗࡓ㸬 ౫Ꮡᛶࢆ ᐃࡍࡿࢩࢫࢸ࣒ࢆᵓ⠏ࡋ㸪a-Ce-Mn ྜ ᚋࡣ㸪☢ṍࡔࡅ࡛࡞ࡃ⇕⭾ᙇࡢ☢ሙ୰ࡢ ᗘ 㔠ࡢ⇕⭾ᙇࡢ☢ሙࡢຠᯝࢆࡉࡽ᫂ࡽࡍࡿ㸬 ౫Ꮡᛶࢆ ᐃࡍࡿࢩࢫࢸ࣒ࢆᵓ⠏ࡋ㸪a-Ce-Mn ྜ ࡲࡓ㸪㏆⸨ຠᯝࡢᢚไࡼࡗ࡚⇕⭾ᙇࡀࢥࣥࢺࣟ 㔠ࡢ⇕⭾ᙇࡢ☢ሙࡢຠᯝࢆࡉࡽ᫂ࡽࡍࡿ㸬 ࣮ࣝࡉࢀࡿࡇࡽ㸪a-Ce-Mn ྜ㔠ᑐࡋඖ⣲⨨ ࡲࡓ㸪㏆⸨ຠᯝࡢᢚไࡼࡗ࡚⇕⭾ᙇࡀࢥࣥࢺࣟ ࡼࡗ࡚㟁Ꮚ≧ែࢆኚࡉࡏ㸪⇕⭾ᙇࡢࢥࣥࢺ ࣮ࣝࡉࢀࡿࡇࡽ㸪a-Ce-Mn ྜ㔠ᑐࡋඖ⣲⨨ ࣮ࣟࣝࢆヨࡳࡿ㸬ࡉࡽ㸪ᮏ◊✲࠾ࡅࡿヨᩱస ࡼࡗ࡚㟁Ꮚ≧ែࢆኚࡉࡏ㸪⇕⭾ᙇࡢࢥࣥࢺ ᅗ 5 x = 50 ࡢ☢ṍࡢ☢ሙ౫Ꮡᛶ ᅗ 5 x = 50 ࡢ☢ṍࡢ☢ሙ౫Ꮡᛶ 〇ἲࢆάࡋ㸪⤌ᡂࢆഴᩳࡉࡏࡓヨᩱࢆస〇ࡋ㸪 ࣮ࣟࣝࢆヨࡳࡿ㸬ࡉࡽ㸪ᮏ◊✲࠾ࡅࡿヨᩱస ᗘ࣭☢ሙࡢࢥࣥࢺ࣮࡛ࣟࣝ㥑ືࡍࡿࢡࢳ࢚ࣗ 〇ἲࢆάࡋ㸪⤌ᡂࢆഴᩳࡉࡏࡓヨᩱࢆస〇ࡋ㸪 ࣮ࢱ࣮⣲Ꮚࡸ⇕⭾ᙇࡢ㐪࠺ᮦᩱࡢ᥋ྜ࡞⏝ ᗘ࣭☢ሙࡢࢥࣥࢺ࣮࡛ࣟࣝ㥑ືࡍࡿࢡࢳ࢚ࣗ ࡛ࡁࡿᮦᩱࡢ㛤Ⓨࢆ┠ᣦࡍ㸬 ࣮ࢱ࣮⣲Ꮚࡸ⇕⭾ᙇࡢ㐪࠺ᮦᩱࡢ᥋ྜ࡞⏝ ࡛ࡁࡿᮦᩱࡢ㛤Ⓨࢆ┠ᣦࡍ㸬 ㅰ㎡ ㅰ㎡ ᮏ◊✲ࡣ㸪JST ◊✲ᡂᯝᒎ㛤ᴗ ◊✲ᡂᯝ᭱㐺 ᒎ㛤ᨭࣉࣟࢢ࣒ࣛࣇ࣮ࢪࣅࣜࢸࢫࢱࢹ ᮏ◊✲ࡣ㸪JST ◊✲ᡂᯝᒎ㛤ᴗ ◊✲ᡂᯝ᭱㐺 ࠙㹄㹑ࠚࢫࢸ࣮ࢪ㸦A-STEP㸧 㸪᥈⣴ࢱࣉ㸦␒ྕ ᒎ㛤ᨭࣉࣟࢢ࣒ࣛࣇ࣮ࢪࣅࣜࢸࢫࢱࢹ AS232Z02108C㸧 ࠕᵓ㐀ࡢࢀࡀ⏕ࡳฟࡍ㧗ᶵ⬟ᕼ ࠙㹄㹑ࠚࢫࢸ࣮ࢪ㸦A-STEP㸧 㸪᥈⣴ࢱࣉ㸦␒ྕ ᅵ㢮ᮦᩱࡢ㛤Ⓨࠖ 㸦2011㹼2012㸧࠾ࡼࡧ㸪ᖹᡂ 22 AS232Z02108C㸧ࠕᵓ㐀ࡢࢀࡀ⏕ࡳฟࡍ㧗ᶵ⬟ᕼ ᖺᗘᐊ⹒ᕤᴗᏛ㸰㸯ୡ⣖⛉Ꮫ◊✲㈝ࠕᵓ㐀つ ᅵ㢮ᮦᩱࡢ㛤Ⓨࠖ㸦2011㹼2012㸧࠾ࡼࡧ㸪ᖹᡂ 22 ๎ᙉ┦㛵ᕼᅵ㢮ྜ㔠ࡢ␗ᖖ⇕ᙎᛶ㛵ࡍࡿ◊✲ࠖ ᖺᗘᐊ⹒ᕤᴗᏛ㸰㸯ୡ⣖⛉Ꮫ◊✲㈝ࠕᵓ㐀つ ࡢຓᡂࢆཷࡅ࡚⾜ࢃࢀࡓࠋ ๎ᙉ┦㛵ᕼᅵ㢮ྜ㔠ࡢ␗ᖖ⇕ᙎᛶ㛵ࡍࡿ◊✲ࠖ x = 50 ࡢ☢ṍࡢ ᗘ౫Ꮡᛶ ᅗ 6 ࡢຓᡂࢆཷࡅ࡚⾜ࢃࢀࡓࠋ ᅗ 6 x = 50 ࡢ☢ṍࡢ ᗘ౫Ꮡᛶ ᑡࡍࡿ㸬ࡇࢀࡣ㸪㏆⸨ຠᯝࡼࡿ⇕⭾ᙇࡢቑࡀ ཧ⪃ᩥ⊩ ☢ሙࡼࡗ࡚ᢚไࡉࢀࡓࡇࢆ♧၀ࡍࡿ㸬ᚑࡗ࡚㸪 ᑡࡍࡿ㸬ࡇࢀࡣ㸪㏆⸨ຠᯝࡼࡿ⇕⭾ᙇࡢቑࡀ a-Ce-Mn ྜ㔠ࡢప ࡢ⇕⭾ᙇࡣ㸪☢ሙࡼࡗ࡚ఏ ☢ሙࡼࡗ࡚ᢚไࡉࢀࡓࡇࢆ♧၀ࡍࡿ㸬ᚑࡗ࡚㸪 ᑟ㟁Ꮚ 4f 㟁Ꮚࡢΰᡂࢆไᚚࡋ⇕⭾ᙇࢆࢥࣥࢺࣟ a-Ce-Mn ྜ㔠ࡢప ࡢ⇕⭾ᙇࡣ㸪☢ሙࡼࡗ࡚ఏ ࣮࡛ࣝࡁࡿࡇࡀࢃࡗࡓ㸬ࡋࡋ㸪㧗 ഃࡢᕧ ᑟ㟁Ꮚ 4f 㟁Ꮚࡢΰᡂࢆไᚚࡋ⇕⭾ᙇࢆࢥࣥࢺࣟ ࡞⇕⭾ᙇಀᩘࡀኚࡋࡓ࠺ࡣᅇࡢ ᐃ ࣮࡛ࣝࡁࡿࡇࡀࢃࡗࡓ㸬ࡋࡋ㸪㧗 ഃࡢᕧ ἲ࠾ࡼࡧ᮲௳࡛ࡣࡲࡔࢃࡽ࡞࠸ࠋ ࡞⇕⭾ᙇಀᩘࡀኚࡋࡓ࠺ࡣᅇࡢ ᐃ ἲ࠾ࡼࡧ᮲௳࡛ࡣࡲࡔࢃࡽ࡞࠸ࠋ 4 ࡲࡵᚋࡢᒎᮃ 4 ࡲࡵᚋࡢᒎᮃ ᮏ◊✲ࡣ㸪Ce ࢆ୰ᚰࡋࡓࣔࣝࣇࢫྜ㔠 ࠾ࡅࡿᙉ┦㛵㟁Ꮚ≀ᛶࢆάࡋࡓḟୡ௦ࡢ㧗ᶵ⬟ ᮏ◊✲ࡣ㸪Ce ࢆ୰ᚰࡋࡓࣔࣝࣇࢫྜ㔠 ᮦᩱࡢ㛤Ⓨࢆ┠ᣦࡋ࡚㸪ࣔࣝࣇࢫᵓ㐀ࡺ࠼ ࠾ࡅࡿᙉ┦㛵㟁Ꮚ≀ᛶࢆάࡋࡓḟୡ௦ࡢ㧗ᶵ⬟ Ꮡᅾྍ⬟࡞ a-CexMn100-x ྜ㔠ࡢᇶ♏≀ᛶ ᐃ␗ᖖ ᮦᩱࡢ㛤Ⓨࢆ┠ᣦࡋ࡚㸪ࣔࣝࣇࢫᵓ㐀ࡺ࠼ ࡞⇕⭾ᙇࡢゎ᫂ࢆ⾜࠺ࡓࡵ㸪☢ṍࡢ ᐃࢆ⾜ࡗࡓ㸬 Ꮡᅾྍ⬟࡞ a-Ce Mn ྜ㔠ࡢᇶ♏≀ᛶ ᐃ␗ᖖ x 100-x ⤌ᡂࡀᣕᢠࡍࡿ x = 50 ࡛ࡣ㸪ᙉ┦㛵㟁Ꮚ≧ែ㸦㏆ ࡞⇕⭾ᙇࡢゎ᫂ࢆ⾜࠺ࡓࡵ㸪☢ṍࡢ ᐃࢆ⾜ࡗࡓ㸬 ⸨ຠᯝ㸧ࡼࡗ࡚⇕⭾ᙇಀᩘࡀ 100 K ௨ୗࡢప ⤌ᡂࡀᣕᢠࡍࡿ x = 50 ࡛ࡣ㸪ᙉ┦㛵㟁Ꮚ≧ែ㸦㏆ ࡛ ᗘࡢῶᑡࡶቑࡍࡿࡇࡀࢃࡗࡓ㸬 ⸨ຠᯝ㸧ࡼࡗ࡚⇕⭾ᙇಀᩘࡀ 100 K ௨ୗࡢప ࡲࡓ㸪☢ሙࡼࡗ࡚㏆⸨ຠᯝࡀᢚไࡉࢀ㸪㈇ࡢ☢ ࡛ ᗘࡢῶᑡࡶቑࡍࡿࡇࡀࢃࡗࡓ㸬 ཧ⪃ᩥ⊩S. 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