Citation: WANG Wen-Qing, SHEN Xin-Chun, NG Yan. Cryogenic Magnetic Transition of D- and L-Alanine: Magnetic Field Dependence of Specific Heat and DC Magnetic Susceptibility[J]. Acta Physico-Chimica Sinica, ;2010, 26(10): 2597-2603. doi: 10.3866/PKU.WHXB20100912 shu

Cryogenic Magnetic Transition of D- and L-Alanine: Magnetic Field Dependence of Specific Heat and DC Magnetic Susceptibility

1.
1. Beijing National Laboratory for Molecular Sciences, Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China;
2. School of Materials Science&Engineering, Beijing Institute of Fashion Technology, Beijing 100029, P. R. China

Received Date: 19 March 2010
Available Online: 27 September 2010
Fund Project: 国家重点基础研究发展规划项目(973) (2004-973-36) (973) (2004-973-36)国家自然科学基金(20452002)资助 (20452002)

To understand the intrinsic asymmetries of D- and L-alanine crystal lattices, the magnetic field dependence of zero-field and 1, 3, and 5 T on the heat capacity were measured from 2 to 20 K. The obtained heat capacity data shows linear behavior that follows: C(T)=aT³+b/T². The first aT³term is from the lattice phonon contribution with C_V=(12/5)π⁴R(T/θ_D)³(θ_D is the Debye temperature). The second b/T ²term in the fitting formula is the magnetic contribution. In this experiment, the obtained C_p data for the D- and L-alanine single crystals show a Boson peak, which is seen as a maximum in the C_p /T ³versus T plots in the low temperature region from 2-20 K at different fields. The four C_p /T ³versus T curves show a split between D-andL-alanine from 2-12 K and this is due to the magnetic contribution. This is absent between 12 and 20 K, which indicates the Schottky anomaly. The temperature of the Boson peak is 9.44 K for D-alanine and 10.86 K for L-alanine, and θ_D is 151.5 and 152.7 K for D-alanine and L-alanine in zero-field, respectively. DC magnetic susceptibility data show the chiral behavior in nuclear spin-electron spin hyperfine interaction at very low temperature.
- Magnetic transition,
- D- and L-alanine,
- Heat capacity,
- DC magnetic susceptibility,
- Boson peak,
- Debye temperature
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