Domain structure of the antiferromagnetic insulating state in Nd0.5Sr0.5MnO3
Domain structure of the antiferromagnetic insulating state in Nd0.5Sr0.5MnO3
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Nd0.5Sr0.5MnO3 反铁磁绝缘态的磁畴结构
DOI：
10.1063/1.1421457
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
D. Paul
中科院分区：
文献类型：
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作者：
I. Shklyarevskiy;M. Shvedun;S. Gnatchenko;P. V. Bentum;P. C. M. Cristianen;J. Maan;K. Kamenev;G. Balakrishnan;D. Paul
在较宽的温度和磁场范围内，研究了Nd0.5Sr0.5MnO_3铁磁金属(FMM)到反铁磁绝缘体(AFI)相变的光学反射率。在FMM−AFI相变过程中观察到了AFI态的磁畴结构的形成。结果表明，所观察到的两类磁区是能量等效态。根据实验结果和对称性分析，我们认为这些微区是晶体孪晶。Nd0.5Sr0.5MnO_3中AFI态的孪生磁区结构在反射的非偏振光中是可见的，这是由于磁区中表面的不同倾斜。还研究了相变附近形成的两相磁畴结构FMM+AFI。研究发现，没有形成热力学平衡的两相条形磁畴结构。磁介质态的消失是由于界面壁具有较大的能量，从而导致了条状结构周期。
Optical reflectivity studies of the ferromagnetic metal (FMM) to antiferromagnetic insulator (AFI) phase transition are performed on Nd0.5Sr0.5MnO3 manganite in a wide temperature and magnetic field range. The formation of a domain structure in the AFI state during the FMM−AFI phase transition is observed. It is shown that the two types of domains observed are energetically equivalent states. On the basis of the experimental results and symmetry analysis we conclude that these domains are crystal twins. The twin domain structure of the AFI state in the Nd0.5Sr0.5MnO3 is visible in reflected unpolarized light due to a different tilting of the surface in the domains. The two-phase domain structure FMM+AFI formed in the vicinity of the phase transition is also studied. It is found that a thermodynamically equilibrium two-phase stripe domain structure does not develop. The absence of the magnetic intermediate state is due to the large energy of the interphase wall, which results in the stripe structure period...