Carrier-induced Magnetic Circular Dichloism in the Magnetoresistive Pyrochlore Tl_2Mn_2O_7(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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概要

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• Infrared magnetic circular dichloism (MCD), or equivalently magneto-optical Kerr effect, has been measured on the Tl_2Mn_2O_7 pyrochlore, which is well known for exhibiting a large magnetoresistance around the Curie temperature T_c∿120K. A circularly polarized, infrared synchrotron radiation is used as the light source. A pronounced MCD signal is observed exactly at the plasma edge of the reflectivity near and below T_c. However, contrary to the conventional behavior of MCD for ferromagnets, the observed MCD of Tl_2Mn_2O_7 grows with the applied magnetic field, and not scaled with the internal magnetization. It is shown that these results can be basically understood in terms of a classical magnetoplasma resonance. The absence of a magnetization-scaled MCD indicates a weak spin-orbit coupling of the carriers in Tl_2Mn_2O_7. We discuss the present results in terms of the microscopic electronic structures of Tl_2Mn_2O_7.

• 社団法人日本物理学会の論文
• 2005-03-15

著者

• Kimura S

  Department Of Physics Faculty Of Science Kobe University

• Nanba T

  Graduate School Of Science And Technology Kobe University

• NANBA Takao

  Graduate School of Science and Technology, Kobe University

• OKAMURA Hidekazu

  Graduate School of Science and Technology, Kobe University

• KIMURA Shinichi

  UVSOR Facility, Institute for Molecular Science

• KORETSUNE Toshihisa

  Graduate School of Science and Technology, Kobe University

• IMAI Hideto

  Fundamental Research Laboratories, NEC Corporation

• SHIMAKAWA Yuichi

  Fundamental Research Laboratories, NEC Corporation

• KUBO Yoshimi

  Fundamental Research Laboratories, NEC Corporation

• Kimura Shinichi

  Department Of Physics And Graduate School Of Science And Technology Kobe University

• Kunii S

  Graduate School Of Science And Technology Niigata University

• Namiki T

  Department Of Physics Tokyo Metropolitan University

• Nanba Takao

  Department Of Physics Faculty Of Science Kobe University

• Nanba Takao

  Graduate School Of Science And Technology Kobe University

• Shimakawa Y

  Nec Corp. Ibaraki Jpn

• Shimakawa Yuichi

  Fundamental Res. Labs. Nec Corp.

• Okamura Hidekazu

  Graduate School Of Science And Technology Kobe University

• Nanba Takao

  Faculty Of Science Kobe University

• Kubo Yoshimi

  Fundamental Res. Labs. Nec Corp.

• Koretsune Toshihisa

  Graduate School Of Science And Technology Kobe University

• Imai Hideto

  Fundamental Research Laboratories Nec Corporation

• Kimura Shinichi

  Uvsor Facility Institute For Molecular Science

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