D-和L-丙氨酸的低温磁相变——磁场变化下的比热和直流磁化率

引用本文: 王文清, 沈新春, 龚. D-和L-丙氨酸的低温磁相变——磁场变化下的比热和直流磁化率[J]. 物理化学学报, 2010, 26(10): 2597-2603. doi: 10.3866/PKU.WHXB20100912 shu

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

D-和L-丙氨酸的低温磁相变——磁场变化下的比热和直流磁化率

基金项目:
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)

摘要:

为了解D-和L-丙氨酸单晶晶格在极低温下是否存在磁手性相变, 在2-20K 下改变磁场强度(0, 1, 3,5 T)测定其比热. 实验结果表明比热和温度之间的函数关系很好地符合C(T)=aT ³+b/T ²方程, 其中aT ³项为晶格声子的贡献, 可由公式C_V=(12/5)π⁴R(T/θ_D)³来描述(θ_D 为德拜温度), b/T ²项为磁场对比热的贡献. 实验发现, 在220K 范围内D-和L-丙氨酸单晶在不同磁场强度下均存在Boson 峰(在C_p /T ³-T 曲线中表现为一个最大值). 磁的贡献导致D-和L-丙氨酸单晶的四条C_p /T ³-T 曲线在2-12K 时不重合, 且在12-20K 时消失, 此即Schottky 反常. 零磁场下,D-和L-丙氨酸的Boson 峰分别为9.44 和10.86 K; 德拜温度分别为151.5 和152.7 K. 结合磁场强度1T 下的直流磁化率测定, 发现在温度低于5K 时,D-和L-丙氨酸单晶有相反的磁化率行为, 反映了核自旋和电子自旋弱相互作用的手性表现.

关键词:

English

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)

国家自然科学基金(20452002)资助

Abstract:

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.

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沈阳化工大学材料科学与工程学院沈阳 110142

D-和L-丙氨酸的低温磁相变——磁场变化下的比热和直流磁化率

English

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

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

D-和L-丙氨酸的低温磁相变——磁场变化下的比热和直流磁化率

English

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

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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