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Metal-to-insulator transitions in 3d-band correlated oxides containing Fe compositions

International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 48-59页

作者： Yiping Yu Yuchen Cui Jiangang He Wei Mao Jikun Chen Key Laboratory of Advanced Materials and Devices for Post-Moore Chips Ministry of EducationUniversity of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Institute of Industrial Science The University of Tokyo4-6-1 KomabaMeguro-kuTokyo 153-8505Japan

Metal-to-insulator transitions (MITs),which are achieved in 3d-band correlated transitional metal oxides,trigger abrupt variations in electrical,optical,and/or magnetic properties beyond those of conventional semiconductors.Among such material families,iron(Fe:3d^(6)4s^(2))-containing oxides pique interest owing to their widely tunable MIT properties,which are associated with the various valence states of Fe.Their potential electronic applications also show promise,given the large abundance of Fe on Earth.Representative MIT properties triggered by critical temperature (TMIT) were reported for ReFe_(2)O_(4)(Fe^(2.5+)),ReBaFe_(2)O_(5)(Fe^(2.5+)),Fe_(3)O_(4)(Fe^(2.67+)),Re_(1/3)Sr_(2/3)FeO_(3)(Fe^(3.67+)),Re Cu_(3)Fe_(4)O_(12)(Fe^(3.75+)),and Ca_(1-x)Sr_(x)FeO_(3)(Fe^(4+))(where Re represents rare-earth elements).The common feature of MITs of these Fe-containing oxides is that they are usually accompanied by charge ordering transitions or disproportionation associated with the valence states of Fe.Herein,we review the material family of Fe-containing MIT oxides,their MIT functionalities,and their respective mechanisms.From the perspective of potentially correlated electronic applications,the tunability of the TMITand its resultant resistive change in Fe-containing oxides are summarized and further compared with those of other materials exhibiting MIT functionality.In particular,we highlight the abrupt MIT and wide tunability of TMITof Fe-containing quadruple perovskites,such as Re Cu3Fe4O12.However,their effective material synthesis still needs to be further explored to cater to potential applications.

关键词： metal-to-insulator transitions Fe-containing oxides charge ordering charge disproportionation

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charge ordering modulations in a Bi_(0.4)Ca_(0.6)MnO_3 film with a thickness of 110 nm

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Chinese Physics B 2012年第8期21卷 482-486页

作者：丁艳华王乙潜蔡鎔声陈允忠孙继荣 The Cultivation Base for State Key Laboratory Qingdao University College of Chemistry Chemical Engineering and Environmental EngineeringQingdao University State Key Laboratory of Magnetism and Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences

The low temperature sample stage in a transmission electron microscope is used to investigate the charge ordering behaviours in a Bi0.4Ca0.6MnO3 film with a thickness of 110 nm at 103 K. Six different types of superlattice structures are observed using the selected-area electron diffraction （SAED） technique, while three of them match well with the modulation stripes in high-resolution transmission electron microscopy （HRTEM） images. It is found that the modulation periodicity and direction are completely different in the region close to the Bi0.4Ca0.6MnO3/SrTiO3 interface from those in the region a little further from the Bi0.4Ca0.6MnO3/SrTiO3 interface, and the possible reasons for this are discussed. Based on the experimental results, structural models are proposed for these localized modulated structures.

关键词： charge ordering selected-area electron diffraction high-resolution transmission electron microscopy pulsed laser deposition

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charge ordering and Antiferromagnetic Transition in La_(0.67-x)Pr_xCa_(0.33)MnO_3 (x=0～0.67) Polycrystalline

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Journal of Rare Earths 2007年第S1期25卷 204-206页

作者：曹晓明卢遵铭王立恒李养贤 School of Material Science and Engineering Hebei University of Technology Hebei No.1 Electric Power Construction Company

Polycrystalline samples of La0.67-xPrxCa0.33MnO3(x=0～0.67) were synthesized by a conventional solid state reaction. X-ray diffraction revealed that the samples were all of single phase with an orthorhombic distorted perovskite structure. The magnetization depended on temperature measured in FC (field cooling) and ZFC (zero field cooling). It revealed that the compounds mainly underwent a ferromagnetic transition (TC) when the less Pr doped (x0.5), the ferromagnetic transition disappeared and the antiferromagnetic transition (TN) was dominant. charge ordering (TCO) also emerged when x>0.36. The transition temperatures TN and TCO would change with the Pr doping content. The phase separation could be used to explain these characters occurred in these polycrystalline samples.

关键词： charge ordering antiferromagnetic phase separation rare earths

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Destruction of charge ordering phase in La_(0.4)Ca_(0.6)MnO_3 induced by low Cr doping

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Rare Metals 2011年第3期30卷 241-246页

作者： PENG Zhensheng YANG Gang WANG Guiying TANG Yonggang GUO Huanyin MAO Qiang Anhui Key Laboratory of Spintronic and Nanometric Materials Cultivating Base Suzhou College Suzhou 234000 China Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China Hefei 230026 China Department of Electronics and Electric Engineering Suzhou College Suzhou 234000 China

Polycrystalline samples of La0.4Cao.6Mn1-xCrxO3 （x = 0.00, 0.02, 0.04, 0.06） were prepared by the solid state reaction method. The influence of Cr3＋ substitution for Mn3＋ on the magnetic property and charge ordering phase of La0.4Ca0.6MnO3 was studied through the measurements of X-ray diffraction （XRD）, magnetization-temperature （M-T） curves and electron spin resonance （ESR） spectra. The experimental results indicate that the mother＇s body of La0.4Ca0.6MnO3 has very complicated magnetic structure, exhibits charge ordering phase at 258 K, and shows long-range strongly correlated charge ordering-antiferromagnetism （CO-AFM） phase from 175 to 50 K. Spin glass state appears when the temperature decreases to about 41 K. When the Cr substitution amount is x = 0.06, the charge ordering phase of the mother＇s body is de-stroyed, because the Cr3＋ substitution for Mn3＋ destroys the spin order of CE-type antiferromagnetism, and thus leads to the melting of charge ordering. It is verified experimentally that the strong coupling between charge order and spin order exists in the charge order system of CE-type antiferromagnetism.

关键词： perovskite manganite chromium doping charge ordering spin-glass state

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Research on charge ordering and magnetic properties in La_(0.3)Ca_(0.7)Mn_(1-x)W_xO_3 system

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Rare Metals 2007年第4期26卷 317-322页

作者： PENG Zhensheng GUO Huanyin YAN Guoqing MAO Qiang Physics Department Suzhou College Suzhou 234000 China Structure Research Laboratory University of Science and Technology of China Hefei 230026 China

The perovskite manganite sample La0.3Ca0.7Mn1-xWxO3 （x = 0.08, 0.12） was prepared by the solid-state reaction method. The effect of W doping on the Mn site to La0.3Ca0.7MnO3 charge ordering phase and the changing process of magnetic properties were studied through the measurement of the M-T curve, M-H curves, and ESR curves of the sample. The results showed that when x = 0.08, the charge ordering （CO） phase exists in the system, the transition temperature Tco= 275 K, and the system exhibits PM when T 〉 275 K. The system transforms from spin-disordering paramagnetism to spin-ordering antiferromagnetism in the charge ordering state with the temperature decreasing from 275 K to 230 K. The long-range antiferromagnetism forms and AFM/CO states coexist between 230 K and 5 K. There is a little ferromagnetic component in the AFM/CO background in a low temperature range. When x = 0.12, the CO phase in the system has almost melted completely. There is a little remnant of the CO phase below 150 K. The system exhibits paramagnetism when T 〉 150 K and transforms from paramagnetism to ferromagnetism when T〈 150 K.

关键词： condensed matter physics charge ordering melting solid-state reaction method magnetic properties

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Magnetic Properties of Perovskite Manganite La_ (0.3)Ca_ (0.7)Mn_ (0.96)W_ (0.04)O_3 in charge ordering Phase

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Journal of Rare Earths 2005年第S1期23卷 251-254页

作者：彭振生郭焕银严国清毛强 MR Materials Research Laboratory Suzhou College Suzhou 234000 China Structure Research Laboratory University of Science and Technology of China Hefei 230026 China MR Materials Research Laboratory Suzhou College Suzhou 234000 China

The sample La_ 0.3Ca_ 0.7Mn_ 0.96W_ 0.04O_3 was prepared by the solid-state method. Magnetic properties of La_ 0.3Ca_ 0.7Mn_ 0.96W_ 0.04O_3 was studied through the measurement of M-T curve, M-H curves and ESR curves of the sample. The results show that: charge ordering (CO) phase forms at 265 K; the system exhibits paramagnetism when T>265 K; it exhibits long-range anti-ferromagnetism (there is a little FM component in AFM background) and the coexistence of a little FM phase and AFM/CO phase forms when Tcharge-ordering state with temperature decreasing from 265 to 225 K. The width of ESR spectrum line of the sample La_ 0.3Ca_ 0.7Mn_ 0.96W_ 0.04O_3 was measured, and the value of the line width of paramagnetic resonance ΔH_ PP increases with temperature decreasing, which indicates that ferromagnetic connection of the sample strengthens with temperature decreasing.

关键词： manganite La_ 0.3Ca_ 0.7Mn_ 0.96W_ 0.04O_3 charge ordering electron paramagnetic resonance magnetic properties

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Destruction of charge-ordering Phase and Influence on Magnetic Property Induced by W Doping at Mn Site of La0.3Ca0.7MnO3

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Journal of Rare Earths 2006年第S2期 192-196页

作者：张明玉彭振生郭焕银毛强严国清 Structure Researsh Laboratory University of Science and Technology of China Hefei 230026 China Materials Research Laboratory Suzhou College Materials Research Laboratory Suzhou College Suzhou 234000 China

The samples of La0.3Ca0.7Mn1-xWxO3 (x=0.00, 0.12, 0.15) were prepared by the solid-state reaction method. The destruction of charge-ordering phase and influence on magnetic property induced by W doping at Mn site of La0.3Ca0.7MnO3 by measuring M-T curves, M-H curves and ESR curves of the samples were studied. The results show that: When x=0.00, the charge-ordering(CO) phase forms at 262 K; the sample exhibits paramagnetism when T>262 K; it exhibits the coexistence of long-range antiferromagnetism (there is a little FM composition in AFM background) and the coexistence of AFM/CO states when Tcharge-ordering state with the temperature decreasing from 262 K (TCO) to 190 K. When x≥0.12, the CO state melts, and there exists paramagnetism-ferromagnetism(PM-FM) transition at extremely low temperature.

关键词： charge ordering melting magnetic property doping at Mn site perovskite oxide rare earths

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Electron Diffraction of La0.27Pr0.4Ca0.33MnO3 with charge ordering Phase

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Journal of Rare Earths 2006年第S2期 18-20页

作者：卢遵铭赵勇孟祥熙董斌李养贤 Tianjin 300130 China School of Material Science and Engineering Hebei University of Technology School of Material Science and Engineering Hebei University of Technology

Polycrystalline sample of La0.27Pr0.4Ca0.33MnO3 was synthesized by a conventional solid state reaction. The electron diffraction and dark-field imaging of the finely grinded sample were prepared. X-ray diffraction reveals that the sample is of single phase with an orthorhombic distorted perovskite structure. The electron diffraction evidence of the charge ordering in La0.27Pr0.4Ca0.33MnO3, obtained at room temperature (293 K), represents a [-101] zone-axis electron diffraction pattern. The diffraction pattern can be indexed with the known orthorhombic crystal structure (space group Pbnm). Sharp superlattice spots can be observed clearly in addition to the fundamental Bragg reflections. The superlattice peak, which can be attributed to the modulating of Mn3+ ions and Mn4+ ions, is the evidence of the presence of the charge ordering at room temperature.

关键词： electron diffraction charge ordering superlattice rare earths

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Tuning charge and orbital ordering in DyNiO_(3) by biaxial strain

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Chinese Physics B 2021年第11期30卷 509-514页

作者：姜丽桐金奎娟任文宁杨国桢 Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China

The first-principles calculations were used to explore the tunable electronic structure in DyNiO_(3)(DNO)under the effects of the biaxial compressive and tensile strains.We explored how the biaxial strain tunes the orbital hybridization and influences the charge and orbital ordering states.We found that breathing mode and Jahn–Teller distortion play a primary role in charge ordering state and orbital ordering state,respectively.Additionally,the calculated results revealed that the biaxial strain has the ability to manipulate the phase competition between the two states.A phase transition point has been found under tensile train.If the biaxial train is larger than the point,the system favors orbital ordering state.If the strain is smaller than the point,the system is in charge ordering state favorably.

关键词： charge ordering orbital ordering Jahn-Teller distortion biaxial strain

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charge ordering and Antiferromagnetic Transition in La0.67-xPrx Ca0.33MnO3(x=0～0.67) Polycrystalline

Charge Ordering and Antiferromagnetic Transition in La0.67-x...

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The Fifth International Conference on Rare Earth Development and Application

作者：曹晓明卢遵铭王立恒李养贤 School of Material Science and Engineering Hebei University of Technology Hebei No.1 Electric Power Construction Company

Polyerystalline samples of LaPrCaMnO (x=0～.67) were synthesized by a conventional solid state reaction.X-ray diffraction revealed that the samples were all of single phase with an orthorhombic distorted perovskite structure.The magnetization depended on temperature measured in FC (field cooling) and ZFC (zero field cooling).It re- vealed that the compounds mainly underwent a ferromagnetic transition (T) when the less Pr doped (x0.5),the ferromagnetic transition disappeared and the antiferromagnetic transition (T) was dominant.charge ordering (T) also emerged when x>0.36.The transition temperatures T and T would change with the Pr doping content.The phase separation could be used to explain these characters occurred in these polycrystal- line samples.

关键词： charge ordering antiferromagnetic phase separation rare earths

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