phase transitions induced by pressure and transport properties in ferromagnetic metal with non-collinear spins

• Project/Area Number: 20740186
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: The University of Tokyo
• Principal Investigator: IGUCHI Satoshi The University of Tokyo, 大学院・工学系研究科, 助教 (50431789)
• Project Period (FY): 2008 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2009: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2008: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
• Keywords: 磁気輸送特性 / フラストレーション系 / モット転移 / 圧力誘起相転移 / 強相関系 / 物性実験 / 磁性 / 圧力効果 / 磁気輸送現象 / 相転移 / 輸送特性

Research Abstract

We have investigated the high pressure effect for the pyrochlore-type molybdates, which is the Mott transition system, to search for new spin-charge coupled phenomena in the geometrically frustrated lattices. It was found that a strongly correlated paramagnetic metal phase emerges under high pressures regardless of the ground state at ambient pressure. This anomalous metallic phase is considered as a result of the spin frustration due to the antiferromagnetic superexchange interaction enhanced by the external pressure.

Research Products

• [Journal Article] Optical Probe for Anomalous Hall Resonance in Ferromagnets with Spin Chirality (2009)
  • Author(s): S. Iguchi, S. Kumakura, Y. Onose, S. Bordacs, I. Kezsmarki, N. Nagaosa, Y. Tokura
  • Journal Title: Phys. Rev. Lett. 103,267206
• [Journal Article] Emergence of a Diffusive Metal State with No Magnetic Order near the Mott Transition in Frustrated Pyrochlore-Type Molybdates (2009)
  • Author(s): S. Iguchi, N. Hanasaki, M. Kinuhara, N. Takeshita, C. Terakura, Y. Taguchi, H. Takagi, Y. Tokura
  • Journal Title: Phys. Rev. Lett. 102,136407
• [Journal Article] Optical Probe for Anomalous Hall Resonance in Ferromagnets with Spin Chirality (2009)
  • Author(s): S.Iguchi
  • Journal Title: Physical Review Letters 103
  • Peer Reviewed
• [Journal Article] Emergence of a Diffusive Metal State with No Magnetic Order near the Mott Transition in Frustrated Pyrochlore-Type Molybdates (2009)
  • Author(s): S.Iguchi
  • Journal Title: Physical Review Letters 102
  • Peer Reviewed
• [Journal Article] Emergence of a diffusive metal state with no magnetic order near the Mott transition in frustrated pyrochlore-type molybdates (2009)
  • Author(s): S. Iguchi
  • Journal Title: Physical Review Letters 102(印刷中(掲載確定))
  • Peer Reviewed
• [Journal Article] Magnetic-Field-Induced Ferroelectric State in DyFeO3 (2008)
  • Author(s): Y. Tokunaga, S. Iguchi, T. Arima, Y. Tokura
  • Journal Title: Phys. Rev. Lett. 101,097205-1-4
• [Journal Article] Magnetic-Field-Induced Ferroelectric State in DyFeO3 (2008)
  • Author(s): Y. Tokunaga
  • Journal Title: Physical Review Letters 101
  • Peer Reviewed
• [Presentation] Emergence of a Diffusive Metal State with No Magnetic Order near the Mott Transition in Frustrated Pyrochlore-Type Molybdates (2009)
  • Author(s): S. Iguchi
  • Organizer: RIKEN Workshop on "Emergent Phenomena of Correlated Materials
  • Place of Presentation: 理化学研究所・和光市
  • Year and Date: 2009-12-03
• [Presentation] Emergence of a Diffusive Metal State with No Magnetic Order near the Mott Transition in Frustrated Pyrochlore-Type Molybdates (2009)
  • Author(s): S.Iguchi
  • Organizer: RIKEN Workshop on "Emergent Phenomena of Correlated Materials"
  • Place of Presentation: 理化学研究所・和光市
  • Year and Date: 2009-12-03
• [Presentation] Emergence of a Diffusive Metal State with No Magnetic Order near the Mott Transition in Frustrated Pyrochlore-Type Molybdates (2009)
  • Author(s): S. Iguchi
  • Organizer: AIST-RIKEN joint workshop 2008
  • Place of Presentation: 沖縄県万国津梁館
  • Year and Date: 2009-03-05
• [Presentation] Emergence of a diffusive metal state with no magnetic order near the Mott transition in frustrated pyrochlore-type molybdates (2009)
  • Author(s): S. Iguchi
  • Organizer: AIST-RIKEN joint workshop 2008
  • Place of Presentation: 沖縄県万国津梁館
  • Year and Date: 2009-03-05
• [Remarks]
  • URL: http://www.cmr.t.u-tokyo.ac.jp/members/each/iguchi.html