镧/钙锰氧化物La_<1-x>Ca_<x>MnO_<3>（x = 0-0.5）的电压-电流-温度表面的金属-绝缘体转变和电阻
Metal-insulator transition and electroresistance in lanthanum/calcium manganites La_<1-x>Ca_<x>MnO_<3> (x = 0-0.5) from voltage-current-temperature surfaces
摘要：
在钙钛矿ABX_中<3>，特别感兴趣的子集是其中A位点被镧系元素离子占据、B位点被稀土元素占据并且X是氧的族，因为这样的材料在磁场中经常表现出电阻的大变化，这是被称为“巨大”磁阻（MR）的现象。这个家族中的另外两个现象也引起了人们的注意：金属-绝缘体转变（MIT）和电阻（ER）。通过测量作为温度函数的电阻并观察梯度符号的变化来揭示MIT。ER -电阻对施加电流的依赖性-通过测量作为施加电流的函数的电阻来揭示。到目前为止，MIT和ER现象被分开处理。在这里，我们报告了在镧/钙锰氧化物中同时观察到的MIT和ER。我们通过测量宽温度范围（10-300 K）的电压-电流曲线来实现这一点，从而使我们能够在电流-温度轴上建立实验电压表面。这些数据直接导致阻力面。这种方法提供了额外的洞察电传输的现象在镧/钙锰氧化物，特别是密切联系的最大ER发生的MIT在那些情况下的顺磁性绝缘体（PMI）铁磁金属（FMM）过渡。
英文摘要：
Of the perovskites, ABX_<3>, a subset of special interest is the family in which the A site is occupied by a lanthanide ion, the B site by a rare earth and X is oxygen, as such materials often exhibit a large change in electrical resistance in a magnetic field, a phenomenon known as "colossal" magnetoresistance (MR). Two additional phenomena in this family have also drawn attention: the metal-insulator transition (MIT) and electroresistance (ER). The MIT is revealed by measuring resistance as a function of temperature, and observing a change in the sign of the gradient. ER - the dependence of the resistance on applied current - is revealed by measuring resistance as a function of applied current. Up until now, the phenomena of MIT and ER have been treated separately. Here we report simultaneous observation of the MIT and ER in the lanthanum/calcium manganites. We accomplish this by measuring voltage-current curves over a wide temperature range (10-300 K) allowing us to build up an experimental voltage surface over current-temperature axes. These data directly lead to resistance surfaces. This approach provides additional insight into the phenomena of electrical transport in the lanthanum/calcium manganites, in particular the close connection of the maximum ER to the occurrence of the MIT in those cases of a paramagnetic insulator (PMI) to ferromagnetic metal (FMM) transition.
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