物理学报Issue(24)：247501-0-247501-8,9.DOI:10.7498/aps.64.247501
双模随机晶场对纳米管上Blume-Cap el模型磁化强度和相变的影响∗
Effects of bimo dal random crystal field on the magnetization and phase transition of Blume-Cap el mo del on nanotub e
摘要
Abstract
Recently, the physical properties and applications of the magnetic nanotube have attracted a great deal of theoretical and experimental attention. The magnetization and phase transition of spin-1 Blume-Capel model on a cylindrical Ising nanotube with bimodal random crystal fields are investigated by using the effective field theory. Employing numerical calculations, we obtain the phase diagrams and the magnetization, which depend on the temperature and the parameters of random crystal fields. Our obtained results are as follows. (i) Changing the probability (p) and the ratio of the crystal fields (α), the bimodal random crystal fields may describe different doped atoms acting on spins. Especially, for p=0.5, choosingα=0,−1.0,−0.5 and 0.5, the bimodal random crystal fields can respectively degrade four typical distributions of random crystal fields, i. e., the distribution of diluted crystal fields, the distribution of symmetry staggered crystal fields, the distribution of non-symmetry staggered crystal fields, and the distribution of same-direction crystal field. (ii) The system exhibits different magnetic properties and phase transition behaviors in the diluted, staggered and same-direction crystal field. The diluted and staggered crystal fields may reduce the magnetization of the system, resulting in the ground state saturation value of magnetization, which is less than 1, while the same-direction crystal fields cannot result in a similar behavior. (iii) The system shows several phase transition temperatures, i.e., first-order and second-order phase transitions and reentrant phenomenon as the parameters of bimodal random crystal fields change. The tricritical point and reentrant phenomenon do exist for certain values of the probability, the negative crystal field and the ratio of the crystal fields in the system. The relevant experiment is needed to verify the above-mentioned theoretical results.关键词
随机晶场/Blume-Capel模型/纳米管/有效场理论Key words
random crystal field/Blume-Capel model/nanotube/effective field theory引用本文复制引用
李晓杰,刘中强,王春阳,徐玉良,孔祥木..双模随机晶场对纳米管上Blume-Cap el模型磁化强度和相变的影响∗[J].物理学报,2015,(24):247501-0-247501-8,9.基金项目
国家自然科学基金(批准号:11275112,11302118)、教育部博士点专项科研基金(批准号:20123705110004)和山东省自然科学基金(批准号：ZR2011AM018, ZR2013AQ015)资助的课题.* Project supported by the National Natural Science Foundations of China (Grant Nos.11275112,11302118), the Specialized Research Fund for the Doctoral Program of Higher Education, China (Grant No.20123705110004), and the Natural Science Foundations of Shandong Province, China (Grant Nos. ZR2011AM018, ZR2013AQ015) （批准号:11275112,11302118）
