NMR study of magnetic properties of Eu1?em class="a-plus-plus">x Sr x MnO3 (0 ?x ?0.5)

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• 作者：Kenji Shimizu (1)
  Masanori Yamaguchi (1)
  Shujuan Yuan (2)
  Shixun Cao (2)
  
• 关键词：Manganites ; Phase separation ; Eu1?x Sr x MnO3 ; Spin ; echo NMR
• 刊名：Journal of the Korean Physical Society
• 出版年：2013
• 出版时间：August 2013
• 年：2013
• 卷：63
• 期：3
• 页码：636-639
• 全文大小：172KB
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• 作者单位：Kenji Shimizu (1)
  Masanori Yamaguchi (1)
  Shujuan Yuan (2)
  Shixun Cao (2)
  
  1. Department of Physics, Faculty of Science, University of Toyama, Toyama, 930-8555, Japan
  2. Department of Physics, Shanghai University, Shanghai, China
  
• ISSN：1976-8524

文摘

The perovskite manganite EuMnO3 is known to be a compound with a narrow e g-band width due to small ionic radius of Eu3+ compared to La3+. The Eu1 ?em class="a-plus-plus">x Sr x MnO3 compounds show complex magnetic properties, depending on the Sr concentration x. We have carried out 55Mn spin-echo nuclear magnetic resonance (NMR) measurements on polycrystalline Eu1?em class="a-plus-plus">x Sr x MnO3 (0 ?x?0.5) compounds at 4.2 or 1.4 K in order to clarify the microscopic local magnetic state of the Mn ions. NMR spectra have been observed in the frequency range from ?50 MHz to ?00 MHz. For the A-type antiferromagnetic EuMnO3, the resonance frequency is about 260 MHz, which is much lower than that observed for Mn3+ in La1?em class="a-plus-plus">x Sr x MnO3. For 0.1 ?x ?0.4, the resonance lines corresponding to Mn4+ and Mn3+ have been observed at about 315 MHz and 390 MHz, respectively. Furthermore, the spectra originating from Mn2+ have been observed around 590 MHz for 0.1 ?x ?0.4. For Eu0.5Sr0.5MnO3, the NMR spectrum spreads widely with several distinct peaks in the frequency range from 250 MHz to 410 MHz, which shows that the compound is in an inhomogeneous state due to competition between the antiferromagnetic and the ferromagnetic states.