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Cryogenic Magnetic Transition of D- and L-Alanine: Magnetic Field Dependence of Specific Heat and DC Magnetic Susceptibility
Wang Wen-Qing1; Shen Xin-Chun1; Gong Yan1,2
2010-10-01
Source PublicationACTA PHYSICO-CHIMICA SINICA
ISSN1000-6818
Volume26Issue:10Pages:2597-2603
AbstractTo 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)= aT(3)+b/T-2. The first aT(3) term is from the lattice phonon contribution with C-V=(12/5)pi R-4(T/Theta(D))(3) (Theta(D) is the Debye temperature). The second b/T-2 term 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 Cp/T-3 versus T plots in the low temperature region from 2-20 K at different fields. The four Cp/T-3 versus T curves show a split between D- and L-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 Theta(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.
KeywordMagnetic Transition D- And L-alanine Heat Capacity Dc Magnetic Susceptibility Boson Peak Debye Temperature
DOI10.3866/PKU.WHXB20100912
Indexed BySCI
Language英语
WOS IDWOS:000282220200002
PublisherPEKING UNIV PRESS
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Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/70094
Collection中国科学院化学研究所
Corresponding AuthorWang Wen-Qing
Affiliation1.Peking Univ, Beijing Natl Lab Mol Sci, Dept Appl Chem, Coll Chem & Mol Engn, Beijing 100871, Peoples R China
2.Beijing Inst Fash Technol, Sch Mat Sci & Engn, Beijing 100029, Peoples R China
Recommended Citation
GB/T 7714
Wang Wen-Qing,Shen Xin-Chun,Gong 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.
APA Wang Wen-Qing,Shen Xin-Chun,&Gong Yan.(2010).Cryogenic Magnetic Transition of D- and L-Alanine: Magnetic Field Dependence of Specific Heat and DC Magnetic Susceptibility.ACTA PHYSICO-CHIMICA SINICA,26(10),2597-2603.
MLA Wang Wen-Qing,et al."Cryogenic Magnetic Transition of D- and L-Alanine: Magnetic Field Dependence of Specific Heat and DC Magnetic Susceptibility".ACTA PHYSICO-CHIMICA SINICA 26.10(2010):2597-2603.
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