Anomalous transport properties and role of spin chiralities in a triangular-lattice conductive magnet

2011 Fiscal Year Final Research Report

• Project/Area Number: 22840036
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: Tokyo Metropolitan University
• Principal Investigator: TAKATSU Hiroshi 首都大学東京, 理工学研究科, 助教 (60585602)
• Project Period (FY): 2010 – 2011
• Keywords: 三角格子 / カイラリティ / 幾何学的フラストレート磁性 / 単結晶育成 / 中性子散乱

Research Abstract

We have studied the spin and electronic structures of the triangular-lattice(TL) antiferromagnet PdCrO_2, in order clarify the role of spin chiralities for the Hall effect of TL magnetic systems. Using high quality single crystals, we revealed by neutron scattering experiments that PdCrO_2 has a non-coplanar spin structure which gives rise to finite spin chiralities in a local site. The angle-dependent magneto resistance shows the periodic enhancement of the electrical resistivity with a metal-nonmetal crossover, interplayed with the two-dimensional electronic structure. The results suggest the possibility that the spin chirality plays a crucial role for anomalous transport properties of this material.

Research Products

• [Journal Article] Absence of Anomalous Negative Lattice-Expansion for Polycrystalline Sample of Tb_2Ti_2O_7 (2012)
  • Author(s): K. Goto, H. Takatsu, T. Taniguchi, H. Kadowaki
  • Journal Title: J. Phys. Soc. Jpn Volume: 81 Pages: 015001
  • Peer Reviewed
• [Journal Article] Quantum spin fluctuations in the spin-liquid state of Tb_2Ti_2O_7 (2012)
  • Author(s): H. Takatsu, H. Kadowaki, T. J. Sato, J. W. Lynn, Y. Tabata, T. Yamazaki, and K. Matsuhira
  • Journal Title: J. Phys. Condens Volume: 24 Pages: 052201
  • Peer Reviewed
• [Journal Article] Single crystal growth of the metallic triangular-lattice antiferromagnet PdCrO_ (2010)
  • Author(s): H. Takatsu, and Y. Maeno
  • Journal Title: J. Cryst Volume: 312 Pages: 3461
  • Peer Reviewed
• [Journal Article] Unconventional Anomalous Hall Effect in the Metallic Triangular-Lattice Magnet PdCrO_2 (2010)
  • Author(s): H. Takatsu, S. Yonezawa, S. Fujimoto, and Y. Maeno
  • Journal Title: Phys. Rev. Lett Volume: 105 Pages: 137201
  • Peer Reviewed
• [Presentation] 三角格子反強磁性体PdCrO_2の導電性と磁気秩序 (2011)
  • Author(s): 高津浩,門脇広明,吉沢英樹, Collin Broholm, Yang Zhao, Mark Green,米澤進吾,前野悦輝,金廷恩,辻成希,高田昌樹
  • Organizer: 日本物理学会、2011年秋季大会
  • Place of Presentation: 富山大学(五福キャンパス)
  • Year and Date: 2011-09-21
• [Presentation] 三角格子反強磁性体PdCrO_2の異常ホール効果 (2010)
  • Author(s): 高津浩
  • Organizer: 第39回化合物新材料研究会
  • Place of Presentation: 東京大学・物性研究所(柏キャンパス)
  • Year and Date: 2010-12-15
• [Presentation] 導電性二次元三角格子酸化物PdMO_2(M=Co, Cr)の巨大な磁気抵抗 (2010)
  • Author(s): 高津浩,石川洵,米澤進吾,前野悦輝,門脇広明, Xiofeng Xu, Patrick Rourke, Nigel Hussey
  • Organizer: 日本物理学会、2010年秋季大会
  • Place of Presentation: 大阪府立大学(中百舌鳥キャンパス)
  • Year and Date: 2010-09-25
• [Presentation] 三角格子反強磁性体PdCrO_2の低温磁気構造 (2010)
  • Author(s): 高津浩,太田真秀,門脇広明,吉沢英樹,米澤進吾,前野悦輝,金廷恩,辻成希,高田昌樹
  • Organizer: 日本物理学会、第66回年次大会
  • Place of Presentation: 新潟大学(五十嵐キャンパス)
  • Year and Date: 2010-03-25