Anomalous transport properties of the conductive triangular-lattice magnet and a non-magnetic simple metal

2013 Fiscal Year Final Research Report

• Project/Area Number: 24740240
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• 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): 2012-04-01 – 2014-03-31
• Keywords: 磁性 / 強相関電子系

Research Abstract

We have studied the anomalous transport properties of the conductive triangular-lattice antiferromagnet PdCrO2 and nonmagnetic PdCoO2. We revealed that PdCrO2 consists of the noncoplanar spin structure, leading to a finite scalar spin chirality at a local site. This structure is probably related to the emergence of the unconventional anomalous Hall effect of this compound. For PdCoO2, we discovered the extremely large magnetoresistance that can reach up to 35000% of the zero field resistivity. Based on the semiclassical calculation, we revealed that the observed large magnetoresistance of PdCoO2 is closely related to the Lorentz-force-driven orbital motion of the high-mobility charge carries.

Research Products

• [Journal Article] Magnetic structure of the conductive triangular-lattice antiferromagnet PdCrO_2 (2014)
  • Author(s): H. Takatsu, G. Nenert, H. Kadowaki, H. Yoshizawa, M. Enderle, S. Yonezawa, Y. Maeno, J. Kim, N. Tsuji, M. Takata, Y. Zhao, M. Green, and C. Broholm
  • Journal Title: Physical Review B Volume: 89 Pages: 104408
  • Peer Reviewed
• [Journal Article] "巨大な磁気抵抗効果を示す単純金属"工業材料2014年1月号【特集】次代を拓く―工業材料キーワード32 (2014)
  • Author(s): 米澤進吾、高津浩
  • Journal Title: 日刊工業材料新聞 Volume: 1月号
• [Journal Article] Electronic Structure of the Metallic Antiferromagnet PdCrO_2 Measured by Angle-Resolved Photoemission Spectroscopy (2013)
  • Author(s): J. A. Sobota, K. Kim, H. Takatsu, M. Hashimoto, S.-K. Mo, Z. Hussain, T. Oguchi, T. Shishidou, Y. Maeno, B. I, Min, and Z. X. Shen
  • Journal Title: Physical Review B Volume: 88 Pages: 125109
  • Peer Reviewed
• [Journal Article] Extremely Large Magnetoresistance in the Nonmagnetic Metal PdCoO_2 (2013)
  • Author(s): H. Takatsu, J. J. Ishikawa, S. Yonezawa, H. Yoshino, T. Shishidou, T. Oguchi, K. Murata, and Y. Maeno
  • Journal Title: Physical Review Letters Volume: 111 Pages: 056601
  • Peer Reviewed
• [Journal Article] Quantum Oscillations and High Carrier Mobility in the Delafossite PdCoO_2 (2012)
  • Author(s): C. W. Hicks, A. S. Gibbs, A. P. Mackenzie, H. Takatsu, Y. Maeno, and Edward A. Yelland
  • Journal Title: Physical Review Letters Volume: 109 Pages: 116401
  • Peer Reviewed
• [Presentation] パイロクロア磁性体Nd_2Ir_2O_7の異常な負の熱膨張 (2013)
  • Author(s): 高津浩、渡邊邦彦、後藤和基、門脇広明
  • Organizer: 日本物理学会、2013年秋大会
  • Place of Presentation: 徳島大学(常三島キャンパス)
  • Year and Date: 20130925-28
• [Presentation] Anomalous Hall effect of the itinerant antiferromagnet (2012)
  • Author(s): H. Takatsu, K. Matsuyama, S. Tomiyoshi and H. Kadowaki
  • Organizer: The international conference on Highly Frustrated Magnetism
  • Place of Presentation: McMaster University (Canada, Toronto)
  • Year and Date: 20120604-08
• [Remarks] 雑誌論文の項で挙げた主要論文[3]はPhysical Review Letters誌のEditors' suggestionに選えらばれ、Physics誌にもSynopsisとして解説記事"The 35000% Solution "が掲載された。
  • URL: http://physics.aps.org/synopsis-for/10.1103/PhysRevLett.111.056601