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On the Paramagnetic-Like Susceptibility Peaks at Zero Magnetic Field in Single Crystals
Shiu-Ming Huang1,2, Pin-Cing Wang1, Kuo-Yi Hung1
1Department of Physics, National Sun Yat-Sen University, 80424 Kaohsiung, Taiwan.
Abstract:
A weakly temperature-dependent paramagnetic-like susceptibility peak at zero magnetic field is observed in with only marginal amount of ferromagnetic impurities. The ferromagnetic hysteresis loop and the magnetic moment splitting between zero-field-cooled and field-cooled processes indicate ferromagnetism in the samples. The paramagnetic-like susceptibility peak height is proportional to the remanent magnetic moment of hysteresis loops. High-resolution transmission electron microscope image supports that the observed ferromagnetic feature originates from lattice distortion. These results imply that the weakly temperature-dependent paramagnetic-like susceptibility peak originates from weak lattice distortion and/or superparamagnetism.
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