JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2009, Vol. 39 ›› Issue (3): 67-70.

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The magnetic glass state in the magnetocaloric material Gd5Ge4

DONG Tong, YUAN Shu-juan, GE Jun-yi, HONG Fang, YU Li-ming, CAO Shi-xun, ZHANG Jin-cang   

  1. DONG Tong, YUAN Shu-juan, GE Jun-yi, HONG Fang, YU Li-ming, CAO Shi-xun, ZHANG Jin-cang:Department of Physics, Shanghai University, Shanghai 200444, China; YUAN Shu-juan:Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
  • Received:2008-12-31 Online:2009-06-16 Published:2009-06-16
  • About author:DONG Tong(1981-), female, born in Shandong Jinan, Graduate student, major in condensed matter physics.E-mail:dongtong0126@126.com
  • Supported by:

    National Natural Science Foundation of China(10504019, 10674092)；Shanghai Nano-technology Promotion Center and the Science ＆ Technology Commie of Shanghai Municipality (0652nm046)

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Abstract:

The metastable property of glasslike dynamics at low temperature of Gd5Ge4 was presented in contrast to the stable frozen spin glass state in cobaltite La0.88Sr0.12CoO3(LSCO). Through investigating the effect of temperature cycle on magnetization at the low temperature region after the zero field cooled procedure ofGd5Ge4andLa0.88Sr0.12CoO3respectively, it was found that the magnetization continues to increase with increasing the temperature cycle in Gd5Ge4, while there was hardly any effect on magnetization inLa0.88Sr0.12CoO3. The dc magnetization and ac susceptibility were also measured on Gd5Ge4 and La0.88Sr0.12CoO3. The peaks of ac susceptibility in Gd5Ge4 did not move to the higher temperature region with increasing frequency, which were different from the phenomena of La0.88Sr0.12CoO3. This kind of magnetic glass state in Gd5Ge4 is quite different from conventional spin glass.

Key words: magnetic glass sate, spin glass, magnetocaloric material

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