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首页> 外文期刊>Physical review >Magnetic and electronic properties of Eu_(1-x)Sr_x.MnO_3 (0.3
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Magnetic and electronic properties of Eu_(1-x)Sr_x.MnO_3 (0.3

机译：Eu_（1-x）Sr_x.MnO_3（0.3

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摘要

Among versatile perovskite manganites showing colossal magnetoresistance (CMR), Eu_(1-x)Sr_xMnO_3 around x～0.4 shows the ferromagnetic metal with the lowest transition temperature (～40 K) due to the narrowest one-electron bandwidth and hence is readily subject to the drastic phase changes with variations in temperature, magnetic field, and hole doping (x). We have investigated the variation in the electronic state with x with use of single crystals. As x increases, the ferromagnetic metal at 0.38≤x≤0.47 changes to a spin-glasslike insulator at 0.48≤x≤0.5, the layered antiferromagnetic (A-type) state at 0.51≤x≤0.6, and the chained antiferromagnetic (C-type) state at 0.6 ≤ x, respectively. Due to the increased disorder upon alloying of Eu/Sr, the charge/orbital ordering with the modulation vector (0, q, 0) with q=1/2 in the orthorhombic Pbnm setting (a_0～b_0～c_0/1/2～1/2a_p, a_p being the lattice parameter of the pseudocubic lattice) cannot be formed in a long range but remains short ranged. In the vicinity of x=0.5, an application of an external magnetic field removes such short-range charge/orbital ordering (q= 1 /2) to cause an insulator to metal transition or CMR. In a broad range of x (0.55≤x≤0.59), the critical temperature for the layered antiferromagnetic state is relatively lowered and alternatively the charge/orbital ordering with q～1 /3 becomes to be visible. It has also been found that the modulation is temperature dependent; commensurate with q～1/3 upon the transition while incommensurate with q> 1/3 at low temperatures.
机译：在具有巨大磁阻（CMR）的通用钙钛矿锰铁矿中，x_0.4附近的Eu_（1-x）Sr_xMnO_3显示出由于最窄的单电子带宽而具有最低的转变温度（〜40 K）的铁磁金属，因此很容易受到剧烈的相位随温度，磁场和空穴掺杂（x）的变化而变化。我们已经研究了使用单晶时电子态随x的变化。随着x的增加，铁磁金属在0.38≤x≤0.47处变为自旋玻璃状绝缘体，在0.48≤x≤0.5处，层状反铁磁（A型）状态在0.51≤x≤0.6处，而链状反铁磁（C-类型）分别处于0.6≤x的状态。由于在Eu / Sr合金化过程中无序性增加，在正交Pbnm设置（a_0〜b_0〜c_0 / 1/2〜）中，q / 1/2的调制矢量（0，q，0）的电荷/轨道排序1 / 2a_p（a_p是伪三次晶格的晶格参数）不能在很长的范围内形成，而是保持在短范围内。在x ＝ 0.5附近，施加外部磁场消除了这种短程电荷/轨道有序（q ＝ 1/2），从而使绝缘体发生金属转变或CMR。在x的较大范围（0.55≤x≤0.59）内，层状反铁磁态的临界温度相对降低，或者可以看出q / 1/3的电荷/轨道有序。还已经发现，调制是温度相关的。转变时与q〜1/3相称，而在低温下与q> 1/3相称。

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