Crystal Structural Phase Transition Induced by Magnetic Field

2003 Fiscal Year Final Research Report Summary

• Project/Area Number: 12640359
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: 固体物性Ⅱ(磁性・金属・低温)
• Research Institution: Keio University
• Principal Investigator: TAJIMA Keisuke Keio University, Science and Technology, Professor, 理工学部, 教授 (70004439)
• Co-Investigator(Kenkyū-buntansha): WAKABAYASHI Nobuyoshi Keio University, Science and Technology, Professor (retired), 理工学部, 教授 (20146575) ; SHIMOMURA Susumu Keio University, Science and Technology, Assistant Professor, 理工学部, 専任講師 (00260216)
• Project Period (FY): 2000 – 2003
• Keywords: itinerant electron magnetism / magnetic phase transition / magnetic phase diagram / X-ray diffraction / magnetovolume effect / flustration / metamagnetism

Research Abstract

Magneto-volume effect in itinerant electron metamagnetic system has been investigated by means of x-ray diffraction under magnetic field and magnetization measurements. Results are compared with those in the localized spin system and characteristic properties in an itinerant system can be discussed.
1) The magnetovolume effect in Laves phase compound Lu(CoGa)_2 which is known as a typical itinerant electron system has been investigated. Results can be well interpreted by the spin fluctuation theory.
2) The first order magnetic phase transition in (FeMn)_2P is also described by the itinerant electron metamagnetic transition which is due to the interaction between two magnetic sub-bands. Results of the measurement for magnetovolume effect suggest that the band structure of paramagnetic and ferromagnetic states is different, which are expected to extend the theoretical understanding itinerant electron metamagnetism in this material.

Research Products

• [Publications] H.Ohsumi: "Magnetoelastic effect in Ho studied by x-ray diffraction."Journal of the Physical Society of Japan. 71. 1732-1739 (2002)
  • Description: 「研究成果報告書概要(和文)」より
• [Publications] K.Tajima: "Magnetic phase transitions and lattice changes in rare earth metals studied by x-ray diffraction under magnetic field."Materials Transactions JIM. 8. 1040-1045 (2000)
  • Description: 「研究成果報告書概要(和文)」より
• [Publications] 田島圭介: "X線回析で眺めた希土類金属の磁歪"日本応用磁気学会誌. 24. 110-115 (2000)
  • Description: 「研究成果報告書概要(和文)」より
• [Publications] K.Hayashi: "X-ray diffraction studies on magneto-volume effect and the first order phase transition in Lu(Co1-xGax)2."Journal of the Physical Society of Japan. 69. 4013-4017 (2000)
  • Description: 「研究成果報告書概要(和文)」より
• [Publications] H.Ohsumi: "Magnetoelastic effect in Ho studied by x-ray diffraction."J.Phys.Soc.Jpn.. 71. 1732-1739 (2002)
  • Description: 「研究成果報告書概要(欧文)」より
• [Publications] K.Tajima, H.Ohsurni, G.Masada: "Magnetic phase transitions and lattice changes in rare earth metals studied by x-ray diffraction under magnetic field."Mater.Trans., JIM. 8. 1040-1045 (2000)
  • Description: 「研究成果報告書概要(欧文)」より
• [Publications] K.Tajima, H.Ohsumi, G.Masada: "Magnetostriction in rare earth metals studied by X-ray diffraction."Nihon ouyou jikigakkaishi (in Japanese). 24. 110-115 (2000)
  • Description: 「研究成果報告書概要(欧文)」より
• [Publications] K.Hayashi, K.Tajima, H.Saito, K.Fukamichi: "X-ray diffraction studies on magneto-volume effect and the first order phase transition in Lu(Co_<1-x>Ga_x)_2."J.Phys.Soc.Jpn.. 69. 4013-4017 (2000)
  • Description: 「研究成果報告書概要(欧文)」より
• [Publications] S.Shimomura, T.Tozegawa, K.Tajima, N.Wakabayashi, N.Ikeda, T.Shobu, Y.Noda, T.Tomioka, Y.Tokura: "X-ray diffuse scattering study on charged-localized states of Pr_<1-x>Ca_xMnO_3 (x=0.35, 0.4, 0.5)"Phys.Rev.. B62. 3875-3878 (2000)
  • Description: 「研究成果報告書概要(欧文)」より
• [Publications] S.Shimomura, T.Tonegawa, K.Torashima, K.Tajima, N.Wakabayashi, H.Kuwahara, Y.Tomioka, Y.Tokura: "X-ray Diffuse Scattering from (Nd_<1-y>Sm_y)_<1-x>Sr_xMnO_3 and Pr_<1-x>Ca_xMn0O_3"AIP Conference Proceedings. 554. 437-441 (2001)
  • Description: 「研究成果報告書概要(欧文)」より