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庞磁电阻材料和稀磁半导体中Griffiths 相有关物理问题研究
  • 项目名称：庞磁电阻材料和稀磁半导体中Griffiths 相有关物理问题研究
  • 项目类别：面上项目
  • 批准号：10574049
  • 申请代码：A040207
  • 项目来源：国家自然科学基金
  • 研究期限：2006-01-01-2008-12-31
  • 项目负责人：袁松柳
  • 负责人职称：教授
  • 依托单位：华中科技大学
  • 批准年度：2005
中文摘要：

Mn基钙钛矿氧化物和稀磁半导体，因磁有序和（金属或半导体）导电性以一种独特的结合方式共存于其中，使得这些材料表现出独特的物理性质而备受人们关注。本项目拟通过电子输运、磁化率、电子顺磁共振、磁化强度、比热等实验，寻求Griffiths相（即顺磁背景上偏析出短程铁磁有序的磁集团）存在的迹象，探讨Griffiths相形成的规律以及随温度和磁场的变化行为，研究该相的形成对电子输运和磁性质等的影响，在此基础上对Griffiths相有关的物理问题进行研究。通过这些研究，拟就下列主要问题予以澄清或赋予新的物理图像(a) 对上述两类磁性材料，提出模型以解释长程磁有序发生前磁化率随温度的变化偏离居里－外斯定律的原因；(b) 将Griffiths理论同双交换机理相结合以解释Mn基钙钛矿氧化物磁转变附近观察到的各种不寻常的物理性质，(c) 提出模型以解释稀磁半导体铁磁性的起因。

中文主题词： Mn基钙钛矿;稀磁半导体;Griffiths相;铁磁集团;渗流
成果综合统计
成果类型
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  • 期刊论文
  • 会议论文
  • 专利
  • 获奖
  • 著作
  • 57
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期刊论文
Tuning colossal magnetoresistance response at room temperature by La2/3+ySr1/3+yMn1-yCryO3
Electrical transport behavior and magnetoresistance properties of (1-x)La2/3Ca1/3MnO3/xSb(2)O(5) com
Phase transformation and magnetic properties of NdxFe60.5-xPt39.5 (x=0, 0.5, 1.0, 1.5) alloys
Giant magnetoresistance and unusual hysteresis behavior in La0.67Ca0.33MnO3/xCuO (x=20%) composite
Enhancement of magnetoresistance in La-2/Ca-3(1)/3MnO3/xCuMn(2)O(4) nanocomposites
Electrical transport and magnetoresistance properties in (1-x)La2/3Ca1/3MnO3/xSb(2)O(5) composites
The effect of transition element doping on the electronic and magnetic properties of La1.4Sr1.6Mn2O7
Ferromagnetism in Fe-doped ZnO bulk samples
Synthesis and magnetic properties of vanadium doped anatase TiO2 nanoparticles
Magnetism in Mn and Co doped ZnO bulk samples
Effects of sintering temperature and atmosphere on magnetism in Mn-doped TiO2 bulk samples
Effect of grain boundary on electrical, magnetic and magnetoresistance properties in La2/3Ca1/3MnO3/
Effect of sintering temperature on electrical transport of La0.67Ca0.33MnO3 granular system with 4%
Magnetic properties in Fe-doped NiO synthesized by co-precipitation
Electrical transport and magnet oresist ance in La0.67Ca0.33MnO3/MgO composites
Electrical transport and giant magnetoresistance in (1-x)La0.67Ca0.33MnO3/xCuO composites,
Exchange bias training effect in NiFe2O4/NiO nanocomposites
Exchange bias effect in a granular system of NiFe2O4 nanoparticles embedded in an antiferromagnetic
Effects of Pr on the structure and magnetic properties of FePt alloys
Structural study and magnetoresistance effect of epitaxial La0.67Sr0.33MnO3-( and Pr0.7Ca0.3MnO3-( m
Enhanced low-field magnetoresistance in the absence of Mn content in polycrystalline La0.67Ca0.33MnO
Effect of 6s lone pair of Bi3+ on electrical transport properties of (La1-xBix)0.67Ca0.33MnO3
Ferromagnetism in manganese and cobalt co-doped ZnO bulk samples
Enhancement of room temperature magnetoresistance in (1-x)La0.67Sr0.33MnO3/x Sb2O5 composites
Electrical transport and magnetoresistance in La2/3Ca1/3MnO3/CuO composites
Suppression of charge order and exchange bias effect in Nd0.5Ca0.5MnO3 nanocrystalline
ELECTRICAL TRANSPORT AND PERCOLATION IN STRUCTURAL PHASE-SEPARATED MANGANITES La1-xBaxMnO3
Preparation and characterization of CBN ternary compounds
Comparison of the magnetic and electrical transport properties of La2/3Ca1/3Mn1-xCrxO3 and La2/3+xCa
Electrical transport and magnetoresistance in La0.67Ca0.33MnO3/BaTiO3 composites
Low field magnetoresistance observed in polycrystalline La0.67Ca0.33Mn1-xO3 sintered at low temperat
La2/3Ca1/3MnO3/Sb2O5复合体系的电子输运和磁电阻行为
Study on the bonding state for carbon–boron nitrogen with different ball milling time
Metastable structure and properties of (La0.73Bi0.27)0.67Ca0.33MnO3
A-site substitution effects on the magnetic and transport properties in La1.4-zYzSr1.6-yBayMn2O7
Monte Carlo study of Griffiths phase in randomly site diluted Ising magnetic system
Electrical transport properties and magnetoresistance of (1-x)La2/3Ca1/3MnO3/xCr(2)O(3) composites
Fe3C cluster confined in single-walled carbon nanotubes: A first-principles study
Hysteresis phenomena in (La0.83Bi0.17)0.67Ca0.33MnO3
Effect of sintering temperature on electrical transport in La0.67Ca0.33MnO3/BaTiO3 composites
Effect of Mg doping on the transport properties and magnetoresistance of La2/3Ca1/3MnO3 prepared in
铜含量对La2/3Sr1/3MnO3的电输运及磁电阻的影响
Synthesis and exchange bias effect of CuFe2O4/NiO nanocomposites
Structure and magnetic properties in Mn doped SnO2 nanoparticles synthesized by chemical co-precipit
Exchange bias and the origin of room temperature ferromagnetism in Fe-doped NiO bulk samples
Magnetic studies on Mn doped TiO2 bulk samples
Effect of annealing conditions on the magnetism of Vanadium-doped TiO2 powders
Electrical transport and magnetic properties in La0.67Ca0.33MnO3 and CuFe2O4 composites
Effect of Coulomb blockade on the low-temperature resistivity minimum of nanomanganite La2/3Ca1/3MnO
Giant magnetore si stance in La0.67Ca0.33MnO3 granular system with CuO addition
Electrical and magnetic properties of bilayer manganites Li1.4Sr1.6Mn1.96TE0.04O7 (TE = mn, fe, ti,
La_(0.67)Sr_(0.33)MnO_3/MgO颗粒系统的电输运和磁电阻
EGCG抗癌分子相关机理研究进展
La0．67Ca0．33MnO3／MgO复合体系中的电输运和磁电阻效应
（1-x）La2／3Ca1／3MnO3／xSb2O5复合体系的电子输运和磁电阻行为
Mn和Co掺杂ZnO块材样品的磁性
Ca和Ba掺杂对La（4／3）Sr（5／3）Mn2O7的磁电阻效应的影响
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