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Strong phonon-magnon coupling of an O/Fe(001) surface

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Science China(Physics,Mechanics & Astronomy) 2020年第11期63卷 115-119页

作者： Yan Zhu YanFei Pan jiyu fan ChunLan Ma Jun Hu XinYuan Wei KaiCheng Zhang HongBin Zhang College of Science Nanjing University of Aeronautics and AstronauticsNanjing 210016China Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application School of Mathematics and PhysicsSuzhou University of Science and TechnologySuzhou 215009China College of Physics Optoelectronics and EnergySoochow UniversitySuzhou 215006China State Key Laboratory of Surface Physics and Key Laboratory for Computational Physical Sciences(MOE)&Department of Physics Fudan UniversityShanghai 200433China College of Mathematics and Physics Bohai UniversityJinzhou 121013China Institute of Materials Science Technical University of DarmstadtDarmstadt 64287Germany

Using density functional calculations,we elucidate the interaction between magnons and phonons on Fe(001)and O/Fe(001)*** effective Heisenberg exchange parameters between neighbor sites(Ji)were derived by fitting the ab initio spin spiral dispersion relation to a classical Heisenberg *** bulk Fe,J5bhas a larger amplitude than *** magnons were softer on the Fe(001)surface than in bulk,but were strengthened on the O/Fe(001)surface through strong interactions between the O and Fe *** four calculated high-energy phonon modes of O/Fe(001)excellently agreed with the experimental *** J1in O/Fe(001)decreased significantly with increasing phonon ***-magnon coupling occurred more easily on O/Fe(001)than on Fe(001).The softening of the magnon on the O/Fe(001)with phonon amplitude was attributed to the reduced amplitude of longitudinal *** moment of the Fe atom of the second layer(Fe2)was especially sensitive to phonon amplitude,regardless of the motion direction of the Fe2 atoms.

关键词： phonon-magnon coupling density functional theory(DFT) spin spiral O/Fe(001)

Magnetic properties and critical behavior of quasi-2D layered Cr_(4)Te_(5)thin film

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Frontiers of physics 2023年第1期18卷 141-151页

作者： Hao Liu jiyu fan Huan Zheng Jing Wang Chunlan Ma Haiyan Wang Lei Zhang Caixia Wang Yan Zhu Hao Yang Department of Applied Physics College of PhysicsNanjing University of Aeronautics and AstronauticsNanjing 211106China Key Laboratory of Aerospace Information Materials and Physics(NUAA) MIITNanjing 211106China Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application School of Mathematics and PhysicsSuzhou University of Science and TechnologySuzhou 215009China School of Materials Engineering Purdue UniversityWest LafayetteIN 47907USA High Magnetic Field Laboratory Chinese Academy of SciencesHefei 230031China College of Physics Science and Technology Yangzhou UniversityYangzhou 225002China

Quasi-2D layered Cr4Te5 thin film has attracted great attention because it possesses the high Curie temperature close to room temperature and relatively large saturation ***,the magnetic interactions and the nature of magnetic phase transition in the Cr4Te5 film have not been explored *** this paper,we focused on the critical behavior of its magnetic phase transition through the epitaxial Cr4Te5 film fabricated by pulsed laser deposition(PLD).The final critical exponentsβ=0.359(2)andγ=1.54(2)were obtained by linear extrapolation together with ArrottNoakes equation of state,and their accuracy was confirmed by using the Widom scaling relation and scaling *** find that some magnetic disorders exist in the Cr4Te5 film system,which is related to Cr4Te5 critical behavior why its critical behavior is quite far from any conventional universality ***,we also determined that the Cr4Te5 film exhibits a quasi-2D long-range magnetic ***,the itinerant ferromagnets of Cr4Te5 films were confirmed by the Takahashi’s self-consistent renormalization theory of spin *** work provides a new idea for understanding the mechanism of magnetic interactions in similar 2D layered films.

关键词： interaction film critical

Field-induced anisotropic magnetic phase transitions and tricritical phenomena in GdCr_(6)Ge_(6)

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Science China(Physics,Mechanics & Astronomy) 2023年第9期66卷 109-118页

作者： Zan Du Azizur Rahman Jiangpeng Song Jun Zhao Wei Liu jiyu fan Chunlan Ma Min Ge Yimin Xiong Li Pi Lei Zhang Yuheng Zhang Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Department of Physics University of Science and Technology of ChinaHefei 230026China Institutes of Physical Science and Information Technology Anhui UniversityHefei 230601China Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Anhui UniversityHefei 230601China Department of Applied Physics Nanjing University of Aeronautics and AstronauticsNanjing 210016China Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application School of Physical Science and TechnologySuzhou University of Science and TechnologySuzhou 215009China Department of Physics School of Physics and Optoelectronics EngineeringAnhui UniversityHefei 230601China Hefei National Laboratory Hefei 230028China High Magnetic Field Laboratory of Anhui Province Hefei 230031China

The interaction between complex magnetic structures and non-trivial band structures in ternary rare-earth GdCr_(6)Ge_(6) induces exotic and abundant electro-magnetic *** this work,we perform a systematical investigation on critical behaviors and magnetic properties of the single-crystal GdCr_(6)Ge_(6).The temperature,field,and angle dependence of magnetization unveils strong magnetic anisotropy along the c-axis and isotropic characteristic in the *** exponentsβ=0.252(1),γ=0.905(9),δ=4.606(3)for H//ab,andβ=0.281(3),γ=0.991(8),δ=4.541(5)for H//c are obtained by the modified Arrott plot method(MAP)and critical isotherm(CI)*** determined exponents for both directions are consistent with the theoretical prediction of a tricritical mean-field *** on detailed magnetization measurements and universality scaling,comprehensive magnetic phase diagrams of GdCr6Ge6for H//ab and H//c are constructed,which reveal that the external field induces a ferromagnetic(FM)transition for H//ab while a ferrimagnetic(FIM)one for H//*** tricritical points are determined for H//ab(11.2 K,266.3 Oe)and H//c(11.3 K,3.3 kOe)on the phase diagrams,*** field-induced anisotropic magnetic configurations and multiple phases are clarified,where the moments of Gd and Cr form FM coupling for H//ab while FIM one for H//c via the interaction between Gd and Cr sublattices.

关键词： field-induced phase transition RT_(6)X_(6)compounds critical analysis tricritical phenomenon anisotropic interaction

Field-induced anisotropic magnetic phase transitions and tricritical phenomena in GdCr6Ge6

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Science China(Physics,Mechanics & Astronomy) 2023年

作者： Zan Du Azizur Rahman Jiangpeng Song Jun Zhao Wei Liu jiyu fan Chunlan Ma Min Ge Yimin Xiong Li Pi Lei Zhang Yuheng Zhang High Magnetic Field Laboratory of Anhui Province Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory Hefei Institutes of Physical ScienceChinese Academy of Sciences Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China Department of Physics University of Science and Technology of China Institutes of Physical Science and Information Technology Anhui University Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Anhui University Department of Applied Physics Nanjing University of Aeronautics and Astronautics Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application School of Physical Science and TechnologySuzhou University of Science and Technology Department of Physics School of Physics and Optoelectronics Engineering Anhui University Hefei National Laboratory

The interaction between complex magnetic structures and non-trivial band structures in ternary rare-earth GdCr6Ge6induces exotic and abundant electro-magnetic phenomena. In this work, we perform a systematical investigation on critical behaviors and magnetic properties of the single-crystal GdCr6Ge6. The temperature, field, and angle dependence of magnetization unveils strong magnetic anisotropy along the c-axis and isotropic characteristic in the ab-plane. Critical exponents β = 0.252（1）, γ =0.905（9）, δ = 4.606（3） for H//ab, and β = 0.281（3）, γ = 0.991（8）, δ = 4.541（5） for H//c are obtained by the modified Arrott plot method（MAP） and critical isotherm（CI） analysis. The determined exponents for both directions are consistent with the theoretical prediction of a tricritical mean-field model. Based on detailed magnetization measurements and universality scaling, comprehensive magnetic phase diagrams of GdCr6Ge6for H//ab and H//c are constructed, which reveal that the external field induces a ferromagnetic（FM） transition for H//ab while a ferrimagnetic（FIM） one for H//c. Two tricritical points are determined for H//ab（11.2 K, 266.3 Oe） and H//c（11.3 K, 3.3 kOe） on the phase diagrams, respectively. The field-induced anisotropic magnetic configurations and multiple phases are clarified, where the moments of Gd and Cr form FM coupling for H//ab while FIM one for H//c via the interaction between Gd and Cr sublattices.

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风采再现——记上海朱家角课植园的扩建

建筑施工 2007年第6期29卷 450-452页

作者：范季玉尹豪俊上海市园林工程有限公司 200083

通过对上海市朱家角课植园的扩建(植园部分),在充分挖掘历史文化、深入研究基地现状、收集大量资料的前提下,用"复园"与"改园"有机结合的手法,再现一座江南私家园林,达到了理想的设计效果。

关键词：课植园扩建复园改园朱家角私家园林

MgS(X^1Σ^+)和MgS_2(X^1A_1)基态的平衡结构与光谱常数

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河南师范大学学报（自然科学版） 2013年第6期41卷 65-67页

作者：蒋利娟付喆范吉钰梁彦天新乡学院物理与电子工程系河南新乡453003 河南省工业学校郑州450011

运用QCISD,QCISD(T),CCSD,CCSD(T)等方法,6-311G,6-311++G(d,p),6-311G(df),6-311++G(3df,3pd),aug-cc-pvdz,aug-cc-pvtz等基组对MgS基态X1Σ+的平衡结构进行优化计算.得出运用CCSD/6-311G(df)方法的结果与实验值最接近;然后用此方法对MgS基态X1Σ+进行谐振频率计算,谐振频率为ωe=537.962 4cm-1,并用最小二乘法把扫描计算的单点能拟合为Murrell-Sorbie函数,由势能函数参数计算与MgS基态X1Σ+相对应的光谱常数,结果与实验数据较为一致.运用CCSD/6-311G方法计算了MgS2(X1 A1)基态的平衡结构与光谱常数.这些数据为MgS团簇的应用研究提供了理论依据.

关键词：平衡结构光谱常数 Murrell—Sorbie函数

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封口膜的红外光谱研究

合成树脂及塑料 2018年第2期35卷 18-23页

作者：王维常明杜林楠范济瑜关胜琴于宏伟齐齐哈尔大学轻工与纺织学院黑龙江省齐齐哈尔市161006 石家庄学院化工学院河北省石家庄市050035

采用变温红外光谱技术,分别研究了封口膜(Parafilm)的一维变温红外光谱和二阶导数变温红外光谱。研究发现:Parafilm主要存在着甲基的不对称伸缩振动峰、亚甲基的不对称伸缩振动峰、亚甲基的对称伸缩振动峰、亚甲基的变角振动峰(δ_(CH_... 详细信息

采用变温红外光谱技术,分别研究了封口膜(Parafilm)的一维变温红外光谱和二阶导数变温红外光谱。研究发现:Parafilm主要存在着甲基的不对称伸缩振动峰、亚甲基的不对称伸缩振动峰、亚甲基的对称伸缩振动峰、亚甲基的变角振动峰(δ_(CH_2))、甲基的不对称变角振动峰(δ_(asCH_3))、甲基的对称变角振动峰、C—C骨架伸缩振动峰和亚甲基的面内摇摆振动峰,最终确定Parafilm的主要结构是聚异丁烯,其临界温度(由结晶转变为无规的温度)为40℃;以Parafilm的δ_(CH_2)和δ_(asCH_3)为对象,进一步研究了相关二维红外光谱;拓展了变温红外光谱技术及二维红外光谱技术在高分子包装材料结构方面的研究范围。

关键词：聚异丁烯封口膜红外光谱结构

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大学物理在线教学中的关键问题及思考

物理与工程 2022年第6期32卷 71-74,79页

作者：樊济宇马海霞南京航空航天大学物理学院应用物理系江苏南京210016

本文总结近一年来全国高校开展网络化教学所存在的普遍性问题,包括教学过程、教学管理、学生自主性、教学资源的运用等几个方面,并结合多年的理论学习和教学经验给出相应的策略。唯有尽快纠正当前网络化教学中的不足和缺失,在推迟开学... 详细信息

本文总结近一年来全国高校开展网络化教学所存在的普遍性问题,包括教学过程、教学管理、学生自主性、教学资源的运用等几个方面,并结合多年的理论学习和教学经验给出相应的策略。唯有尽快纠正当前网络化教学中的不足和缺失,在推迟开学的情况下才能真正实现停课不停学,并按照教学计划保质保量完成教学任务。在文章的最后,笔者提出疫情结束后线上教学和线下教学长期有效结合等对大学物理课程教学改革的相应思考与建议。

关键词：大学物理在线教学教学改革

La位Dy替代对La_(0.67-x)Dy_xSr_(0.33)MnO_3体系磁性的影响

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郑州大学学报（理学版） 2005年第4期37卷 42-45页

作者：徐素军樊济宇童伟中国人民解放军防空兵指挥学院信息控制系郑州450052 中国科学技术大学结构分析实验室合肥230026

研究了La0.67-xDyxSr0.33MnO3磁结构的变化规律,结果表明,所有样品在居里温度TC处发生顺磁-铁磁相变,掺杂样品在TN 详细信息

研究了La0.67-xDyxSr0.33MnO3磁结构的变化规律,结果表明,所有样品在居里温度TC处发生顺磁-铁磁相变,掺杂样品在TN

关键词：铁磁-反铁磁奈耳温度亚晶格磁畴旋转