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Citation: SHEN Xin-Chun, WANG Wen-Qing, NG Yan, ZHANG Yan. Dynamical Spin Chirality and Magnetoelectric Effect of α-Glycine[J]. Acta Physico-Chimica Sinica, ;2008, 24(12): 2153-2158. doi: 10.1016/S1872-1508(08)60081-9 shu

Dynamical Spin Chirality and Magnetoelectric Effect of α-Glycine

1.
Beijing National Laboratory for Molecular Sciences, Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China; School of Medicine, Tsinghua University, Beijing 100084, P. R. China; School of Physics, Peking University, Beijing 100871, P. R. China

Received Date: 7 July 2008
Available Online: 3 November 2008

Dynamical spin chirality of α-glycine crystal at 301-302 K was investigated by DC (direct current)-magnetic susceptibility measurement at temperatures ranging from2 to 315 Kunder the external magnetic fields (H=±1 T) parallel to the b axis. The α-glycine crystallizes in space group P21/n with four molecules in a cell, which has centrosymmetric charge distribution. The bifurcated hydrogen bonds N+(3)—H(8)…O(1) and N+(3)—H(8)…O(2) are stacked along the b axis with different bond intensities and angles, which formanti-parallel double layers. Atomic force spectroscopy result at 303 K indicated that the surface molecular structures of α-glycine formed a regular flexuous framework in the b axis direction. The strong temperature dependence is related to the reorientation of NH+3 group and the electron spin flip-flop of (N+H) mode. Under the opposite external magnetic field of 1 T and -1 T, the electron spins of N+(3)—H(8)…O(1) and N+(3)—H(8)…O(2) flip-flop at 301-302 K. These results suggested a mechanism of the magnetoelectric effect based on the dynamical spin chirality of (N +H), which induced the electric polarization to produce the onset of pyroelectricity of α-glycine around 304 K.
- α-Glycine,
- Dynamical spin chirality,
- Magnetoelectric effect,
- Pyroelectricity,
- DC-magnetic susceptibility,
- Atomic force spectroscopy
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