欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
研究了退火对磁场诱导下高定向热解石墨（HOPG）输运特性的影响，结果表明，退火后HOPG的R—T曲线明显变得光滑，且退火后电阻率增大了近50％，相应温度下的磁电阻效应均减小约40％。分析认为，这是由于HOPG内部存在层错与所含杂质缺陷引起的。磁场下电阻率随温度的变化表明，外加磁场对低温下的金属导电行为存在抑制作用，随着外加磁场的增加，低温下的金属导电行为受到抑制，在H=5．57×10^4A／m时，低温下的绝缘体一金属转变（I—M）被完全抑制，呈半导体性质。随着磁场的继续增加，在磁场高于H=9．24×10^5A／m时再次出现绝缘体-金属转变，即再入型金属导电行为，且退火对这一转变过程没有影响，表明这种绝缘体-金属转变是由外加磁场诱导产生的。
英文摘要：
This paper studies the effect of annealing on the transport properties for the highly oriented pyrolytic graphite. Found that the annealing procedure could smooth the R-T curve of HOPG,doubling its resistivity,reducing its magnetoresistance by 40%. These could be attributed to the stacking-fault and impurities in the HOPG sample. Temperature dependence of the basal-plane resistivity reveals that the magnetic field restrains the metallic behavior ofHOPG at low temperatures. The metallic behavior disappears under H= 5.57 ×10^4 A/m and a reentrant metallic behavior appears under H = 9.24×10^5 A/m with no dependence on the sample annealing, indicates that the I-M transition is a magnetic field induced phenomenon.
同期刊论文项目
同项目期刊论文
Observation of twin-like composition modulation and phase seperation with long-range order induced b
Magnetization reversal and Yb3+/Cr3+ spin ordering at low temperature for perovskite YbCrO2 chromite
Three-dimensional superconductivity in nominal composition Fe1.03Se with Tc up to 10.9K induced by i
Ferromagnetic signal and unconventional Kondo-like effect in the superconductiong Y1-xPrxBa2Cu3O7-de
Effects of ferroelectric-poling-induced strain on the quantum correction to low-temperature resistiv
Evidence of possible quantum orbital transfer and step-like transport jump in phase-separated mangan
Magnatic field induced phase transition and transport properties in phase separated Eu0.5Sr0.5MnO3 s
Weak exchange effect and large refrigerant capacity in a bulk metallic glass Gd0.32Tb0.26Co0.20Al0.2
Effects of Ca substitution on the magnetic properties in La1-xCaxMn0.90Cu0.10O3 (x=0.05-0.30) mangan
The research on the mechanism of formation and property of MnZn ferrite nanocrystallite in different
Multiferroic composites in nano-microscale with non-solid solution by Co-ferrite and (K0.5Na0.5)NbO3
PeckCryst: a program for structure determination from powder diffraction data using a particle swarm
期刊信息
位置：