中国物理B ›› 2001, Vol. 10 ›› Issue (4): 345-348.doi: 10.1088/1009-1963/10/4/318

• • 上一篇    

STRUCTURE, MAGNETIC PROPERTIES AND GIANT MAGNETORESISTANCE OF YMn6Sn6-xGax (x=0-0.6) COMPOUNDS

张绍英, 赵鹏, 李润伟, 孙继荣, 成昭华, 张宏伟, 沈保根   

  1. State Key Laboratory of Magnetism, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China
  • 收稿日期:2000-11-23 出版日期:2001-04-15 发布日期:2005-07-11
  • 基金资助:
    Project supported by the State Key Project of Fundamental Research and the National Natural Science Foundation of China (Grant No. 19804017).

STRUCTURE, MAGNETIC PROPERTIES AND GIANT MAGNETORESISTANCE OF YMn6Sn6-xGax (x=0-0.6) COMPOUNDS

Zhang Shao-ying (张绍英), Zhao Peng (赵鹏), Li Run-wei (李润伟), Sun Ji-rong (孙继荣), Cheng Zhao-hua (成昭华), Zhang Hong-wei (张宏伟), Shen Bao-gen (沈保根)   

  1. State Key Laboratory of Magnetism, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2000-11-23 Online:2001-04-15 Published:2005-07-11
  • Supported by:
    Project supported by the State Key Project of Fundamental Research and the National Natural Science Foundation of China (Grant No. 19804017).

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摘要： Structure, magnetic and transport properties of YMn6Sn6-xGax (0≤x≤0.6) compounds with a HfFe6Ge6-type structure were investigated. It was found that the Ga substitution leads to a contraction of the unit-cell volume. A transition from an antiferromagnetic to a ferromagnetic (or ferrimagnetic) state can be observed for samples (0.1≤x≤0.2) with increasing temperature. The antiferro-ferromagnetic transition for samples with x≤0.2 can also be induced by an external field. The required field is very low, and decreases with increasing Ga concentration. More Ga concentration (x≥0.3) leads to the samples being ferromagnetic in the whole temperature range below the Curie temperature. The Ga substitution weakens the interlayer magnetic coupling between the Mn spins. Corresponding to the metamagnetic transition, a magnetoresistance as large as 32% under a field of 5 T was observed at 5 K for the sample with x=0.2.

Abstract: Structure, magnetic and transport properties of YMn6Sn6-xGax (0≤x≤0.6) compounds with a HfFe6Ge6-type structure were investigated. It was found that the Ga substitution leads to a contraction of the unit-cell volume. A transition from an antiferromagnetic to a ferromagnetic (or ferrimagnetic) state can be observed for samples (0.1≤x≤0.2) with increasing temperature. The antiferro-ferromagnetic transition for samples with x≤0.2 can also be induced by an external field. The required field is very low, and decreases with increasing Ga concentration. More Ga concentration (x≥0.3) leads to the samples being ferromagnetic in the whole temperature range below the Curie temperature. The Ga substitution weakens the interlayer magnetic coupling between the Mn spins. Corresponding to the metamagnetic transition, a magnetoresistance as large as 32% under a field of 5 T was observed at 5 K for the sample with x=0.2.

Key words: structure, magnetic properties, magnetoresistance

中图分类号:  (Giant magnetoresistance)

  • 75.47.De
75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))