Physical Properties of Sr-Doped Double Perovskite La2NiMnO6

Abstract

A series of double perovskite manganese oxide La2−xSrxNiMnO6 (x = 0, 0.05, 0.1) samples were prepared by solid-state synthesis. The XRD patterns show that the three samples have perovskite crystal structures. The temperature dependence of the magnetization curves for La2−xSrxNiMnO6 (x = 0, 0.05, 0.1) near the Curie temperature indicates that Sr-doping weakens the ferromagnetism while enhancing the antiferromagnetism of this system, and the field-dependent magnetization curves further confirm this conclusion. The hysteresis loops, the enlarged views of the hysteresis loops at 2 K, and the Raman spectra of the three samples indicate that Sr-doping increases the antisite disorder degree, the number of antisite defects, and the antiphase boundaries, and the antiferromagnetic coupling between the antiphase boundaries and the surrounding ferromagnetic regions is enhanced. At the same time, the temperature dependence of the inverse magnetic susceptibility changes from an upward deviation from the Curie-Weiss law to a downward trend. This phenomenon can be explained by the opposing changes in the relative strength between the antisite defects and the antiferromagnetic coupling strength. After Sr-doping, the field-cooling curve and field-warming curve of the LSNMO system do not coincide, which is typical of a first-order phase transition. This phenomenon is further confirmed by the rescaling and arrott curves. The temperature dependence of the resistivity curves shows that the La2−xSrxNiMnO6 (x = 0, 0.05, 0.1) samples are all semiconductor materials. Following Sr-doping, the metal-insulator transition temperature of the system decreases, and the difference between the resistivity values measured at 0 T and 2 T increases.

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Funding

Project supported by the National Natural Science Foundation of China (Grant Nos. 11164019, 51562032, 61565013), the Science Foundation of Inner Mongolia, China (Grant No. 2015MS0109), the Inner Mongolia Science Research Fund in Higher Education Institutions, China (NJZZ11166, NJZY12202, NJZY16237), the Production and Research Joint Program of the Baotou Science and Technology Bureau, China (2014X1014-01, 2015Z2011), and the Postgraduate Scientific Research Innovation Program of Inner Mongolia, China (S201710127 (S01)).

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Correspondence to Jian-Jun Zhao.

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Wang, T., Wu, HY., Sun, YB. et al. Physical Properties of Sr-Doped Double Perovskite La2NiMnO6. J Supercond Nov Magn 33, 727–739 (2020). https://doi.org/10.1007/s10948-019-05231-4

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Keywords

  • Double perovskite
  • Antisite disorder
  • Antiphase boundaries
  • Antiferromagnetic coupling

PACS

  • 75.47.Lx
  • 91.60.Pn
  • 75.50.Ee
  • 75.60.-d