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A-site ordered state in manganites with perovskite-like structure based on optimally doped compounds Ln0.70Ba0.30Mno3（Ln=Pr,Nd）

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Journal of Rare Earths 2019年第11期37卷 1242-1249页

作者： S.V.Trukhanov VA Khomchenko D.V.Karpinsky M.V.Silibin A.V.Trukhanov L.S.Lobanovsky H.Szymczak C.E.Botez i.o.troyanchuk National University of Science and Technology MiSiS 119049 MoscowLeninsky Av.4Russia South Ural State University 454080 ChelyabinskLenin Av.76Russia Scientific-Practical Materials Research Centre of NASB 220072 MinskBelarus CFisUC Department of PhysicsUniversity of Coimbra3004-516 CoimbraPortugal National Research University of Electronic Technology"MiET 124498 ZelenogradMoscowRussia institute for Bionic Technologies and Engineering I.M.Sechenov First Moscow State Medical University2-4 Bolshaya Pirogovskaya St.119991 MoscowRussia institute of Physics Polish Academy of Sciences02-668 WarsawPoland The University of Texas at El Paso El PasoTX 79968-0515USA

in this paper,we report on the crystal structure and magnetic properties of the nano structured Baordered phases of rare-earth manganites obtained from the optimally doped solid solutions Ln0.70Ba0.30Mno3(Ln=Pr,Nd).The materials were studied by X-ray diffraction,scanning electron microscopy,energy dispersive spectroscopy and SQUiD-magnetometry *** is found that states with different degrees of cation ordering in the A-sublattice of the ABo3 perovskite can be obtained by employing special conditions of chemical *** particular,reduction of the parent compounds results in the formation of a nanocomposite containing ferrimagnetic anion-deficient ordered phase *** of the composite does not change an average size of the nanocrystallites,but drastically alters their phase composition to stabilize ferromagnetic stoichiometric ordered phase LnBaMn2o6 and ferromagnetic superstoichiometric disordered phase Ln0.90Ba0.10Mno3+δ.it is shown that the magnetic properties of the materials are determined by the joint action of chemical(cation ordering)and external(surface tension)pressures.

关键词： ionic order Magnetic transition Perovskite Manganite Rare earths

Ferromagnetic Antiresonance and Giant Microwave Magneto-impedance in Polycrystalline La0.49Sr0.51Mno3

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Chinese Physics Letters 2008年第3期25卷 1124-1127页

作者：柳文军舒启清 S. M. BHAGAT i. o. troyanchuk College of Materials Science and Engineering Shenzhen University Shenzhen 518060 Shenzhen Key Laboratory of Special Functional Materials Shenzhen 518060 Department of Physics University of Maryland College Park Maryland 20742-4111 USA institute of Solid State and Semiconductor Physics National Academy of Sciences of Belarus P. Brovki Street 17 Minsk 220072 Belarus

The ferromagnetic antiresonance （FMAR） phenomenon, i.e., the minimum of the microwave absorption, in polycrystalline La0.49Sr0.51Mno3 is observed near Curie temperature TC = 282 K. Temperature-dependences of magnetization μ0M are obtained from the FMAR. The results show that as μ0H = 0, by fitting the scaling law M ∝ （TC -T）^β to temperature-dependences of μ0M at the different microwave frequencies, it yields TC=281.2 K and β = 0.47. However, temperature-dependences of μ0M under different μ0H are not in agreement with the scaling law. Due to FMAR, about 40% giant microwave magneto-impedance at 11.9 GHz can occur under a low field μ0H = 0.03 T.

关键词： MAGNEToRESiSTANCE MANGANiTES LA0.7SR0.3MNo3

多晶La_(0.49)Sr_(0.51)Mno_3中的铁磁反共振

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深圳大学学报（理工版） 2006年第4期23卷 314-319页

作者：舒启清柳文军 Bhagat S M Lofland S E troyanchuk i o 深圳大学材料学院深圳市特种功能材料重点实验室深圳518060 马里兰大学物理系白俄罗斯科学院固体物理研究所

采用谐振腔微扰技术测量了多晶La_(0.49)Sr_(0.51)Mno_3的微波吸收(PMA),观察到在居里温度TC或奈尔温度TN附近发生PMA呈现极小值即铁磁反共振(FMAR)现象.基于朗道-利弗希茨-吉尔伯特模型,磁化强度μ0M对温度的依赖关系可以从FMAR得到.... 详细信息

采用谐振腔微扰技术测量了多晶La_(0.49)Sr_(0.51)Mno_3的微波吸收(PMA),观察到在居里温度TC或奈尔温度TN附近发生PMA呈现极小值即铁磁反共振(FMAR)现象.基于朗道-利弗希茨-吉尔伯特模型,磁化强度μ0M对温度的依赖关系可以从FMAR得到.发现当外加直流磁场μ0H=0时,不同微波频率下得到的磁化强度μ0M对温度的依赖关系与标度律符合.然而,当μ0H≠0且μ0Ho_3是一种由铁磁(FM)和反铁磁(AFM)等多态微区组成的密切合物,是一个包含多个状态和取向互不相同的畴壁的复杂系统;②在μ0H增强或温度下降的过程中,都存在导致PMA增加或减少的两种机制的竞争.

关键词：多晶La0.49Sr0.51Mno3 微波吸收铁磁反共振标度律密切合物

多晶La_(0.49)Sr_(0.51)(Mn_(1-x)Nb_x)o_3的磁电阻研究

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深圳大学学报（理工版） 2005年第4期22卷 297-302页

作者：柳文军朱德亮舒启清马晓翠 troyanchuk i o 深圳大学理学院白俄罗斯科学院固体物理研究所

采用四探针法测量多晶La0.49Sr0.51(Mn1-xNbx)o3(x=0,0.05,0.15和0.25)在磁场下的电阻率温度曲线.实验结果显示:①在0.45T磁场下,对于x=0和x=0.25的样品,几乎观察不到磁电阻(Magnetoresistance,MR)效应,而对于x=0.05和x=0.15的样品,磁电阻效应较明显.这种差异可能与样品中铁磁相是否占主导作用有关;②比较x=0.05和x=0.15这两种样品的MR机制,前者可能与载流子在弱连接晶界上的自旋相关散射有关,且其主要是非本征的;而后者主要是本征的.

关键词：多晶La0.49Sr0.51(Mn1-xNbx)o3 庞磁电阻自旋极化电子输运

Thermodynamic potential and phase diagram for multiferroic bismuth ferrite(BiFeo_(3))

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npj Computational Materials 2017年第1期3卷 284-293页

作者： Dmitry V.Karpinsky Eugene A.Eliseev Fei Xue Maxim V.Silibin Alexandra Franz Maya D.Glinchuk igor o.troyanchuk Sergey A.Gavrilov Venkatraman Gopalan Long-Qing Chen Anna N.Morozovska Scientific-Practical Materials Research Centre of NAS of Belarus P.Brovki str.19 Minsk 220072Belarus National Research University of Electronic Technology“MiET” Bld.1Shokin sq.ZelenogradMoscow 124498Russia institute for Problems of Materials Science National Academy of Sciences of UkraineKrzhizhanovsky str.3 Kyiv 03680Ukraine Department of Materials Science and Engineering Pennsylvania State UniversityUniversity Park State CollegePA 16802USA Helmholtz Center Berlin Hahn-Meitner-Platz 1Berlin 14109Germany institute of Physics National Academy of Sciences of Ukraine46pr.Nauky Kyiv 03028Ukraine

We construct a Landau-Ginzburg thermodynamic potential,and the corresponding phase diagram for pristine and slightly doped bismuth ferrite,a ferroelectric antiferromagnet at room *** potential is developed based on new X-ray and neutron diffraction experiments complementing available *** demonstrate that a strong biquadratic antiferrodistortive-type coupling is the key to a quantitative description of Bi_(1−x)La_(x)Feo_(3) multiferroic phase diagram including the temperature stability of the antiferromagnetic,ferroelectric,and antiferrodistortive phases,as well as for the prediction of novel intermediate structural ***,we show that“rotomagnetic”antiferrodistortive-antiferromagnetic coupling is very important to describe the ferroelectric polarization and antiferrodistortive tilt behavior in the R3c phase of BiFeo_(3).The Landau-Ginzburg thermodynamic potential is able to describe the sequence of serial and trigger-type phase transitions,the temperature-dependent behavior of the order parameters,and the corresponding susceptibilities to external *** can also be employed to predict the corresponding ferroelectric and antiferrodistortive properties of Bi_(1−x)La_(x)Feo_(3) thin films and nanoparticles by incorporating the gradient and surface energy terms that are strongly dependent on the shape,size,and preparation method.

关键词： ferrite ferroelectric diagram

多晶La_(0.49)Sr_(0.51)(Mn_(1-x)Nb_x)o_3的电输运特性研究

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深圳大学学报（理工版） 2004年第4期21卷 339-343页

作者：柳文军舒启清马晓翠杜建设李逢明 troyanchuk i.o 深圳大学理学院深圳518060 白俄罗斯科学院固体物理研究所

测量了B位掺杂的钙钛矿结构锰氧化物La0 49Sr0 51(Mn1-xNbx)o3(x=0,0 05,0 15和0 25)的电阻率和磁化强度的温度特性.实验结果表明,当Nb5+部分替代B位的Mn4+离子时,电阻率-温度特性由原来单一的半导体型转变成了高温时的半导体(绝缘体)... 详细信息

测量了B位掺杂的钙钛矿结构锰氧化物La0 49Sr0 51(Mn1-xNbx)o3(x=0,0 05,0 15和0 25)的电阻率和磁化强度的温度特性.实验结果表明,当Nb5+部分替代B位的Mn4+离子时,电阻率-温度特性由原来单一的半导体型转变成了高温时的半导体(绝缘体)型和低温时的类金属型.随Nb掺杂量增大,电阻率迅速升高3～5个数量级,半导体(绝缘体)-类金属转变温度降低.在掺杂Nb的样品中,只观察到顺磁-铁磁转变,而未观察到铁磁-反铁磁转变.上述实验结果的一种可能解释是掺杂改变了磁有序时电子自旋的排列和空间取向,从而改变载流子被自旋热涨落的散射作用和载流子转移的随机性.

关键词： La0.49Sr0.51(Mn1-xNb2)o3 电阻率半导体-金属转变磁化强度