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Enhanced orbital fluctuations in Mg-doped MnV_2O_4 single crystals

机译：增强Mg掺杂MNV_2O_4单晶的轨道波动

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摘要

We investigated the magnetic and structural transitions of Mn1-xMgxV2O4 (x = 0, 0.05, 0.1, 0.15) single crystals with a normal spinel structure. These crystals all exhibit a cubic-to-tetragonal structural transition at T-S caused by the orbital ordering of V3+ ions, which is followed by a ferrimagnetic ordering transition at T-M. We found that T-M is equal to T-S for x = 0.1, but the ferrimagnetic transition is shifted to lower temperature by Mg doping and T-S and T-M can be separated clearly for x = 0.15. Moreover, a certain degree of orbital fluctuations was brought about by the ferrimagnetic transition at T-M, but suppressed below T*, leading to another transition from weak orbital fluctuations to further orbital ordering at T*. The orbital fluctuations were caused by the anomalous interchain interaction J(c) and can be also enhanced by the substitution of Mg for Mn due to the decrease of the distance between V3+ ions along the c direction R-c(v-v), which results in the increase of J(c).
机译：我们研究了具有正常尖晶石结构的Mn1-XMGXV2O4（X = 0,0.5,0.1,0.15）单晶的磁性和结构转变。这些晶体均在由V3 +离子的轨道排序引起的T-S中表现出立方对四方结构转变，然后在T-m处进行亚铁磁性排序转变。我们发现T-M等于X <= 0.1的T-S，但是使用Mg掺杂和T-S和T-M表示X = 0.15的X = 0.15分离X = 0.15的X = 0.15的X = 0.15分离X = 0.15的温度等于T-S等于T-S。此外，通过T-M的亚铁磁性过渡引起一定程度的轨道波动，但抑制在T *以下，导致从弱射轨道波动到T *进一步轨道排序的另一个过渡。由异常的间隔相互作用J（c）引起的轨道波动，并且由于沿着C方向RC（VV）的V3 +离子之间的距离降低，也可以通过MN的差异来增强MG，这导致增加j（c）。

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  • 来源
    《Physical review》 |2019年第22期|224418.1-224418.6|共6页
  • 作者

    Liu Qing-Yuan; Liu Zi-Yi; Zhou Xue-Bo; Yajima Takeshi; Uwatoko Yoshiya; Cheng Jin-Guang; Tao Lei; Liu Zhi-Guo; Huo Ming-Xue; Wang Xian-Jie; Sui Yu;

  • 作者单位

    Harbin Inst Technol Sch Phys Harbin 150001 Heilongjiang Peoples R China;

    Harbin Inst Technol Sch Phys Harbin 150001 Heilongjiang Peoples R China|Chinese Acad Sci Beijing Natl Lab Condensed Matter Phys Beijing 100190 Peoples R China|Chinese Acad Sci Inst Phys Beijing 100190 Peoples R China;

    Harbin Inst Technol Sch Phys Harbin 150001 Heilongjiang Peoples R China;

    Univ Tokyo Inst Solid State Phys Kashiwanoha 5-1-5 Kashiwa Chiba 2778581 Japan;

    Univ Tokyo Inst Solid State Phys Kashiwanoha 5-1-5 Kashiwa Chiba 2778581 Japan;

    Chinese Acad Sci Beijing Natl Lab Condensed Matter Phys Beijing 100190 Peoples R China|Chinese Acad Sci Inst Phys Beijing 100190 Peoples R China|Songshan Lake Mat Lab Dongguan 523808 Guangdong Peoples R China;

    Harbin Inst Technol Lab Space Environm & Phys Sci Harbin 150001 Heilongjiang Peoples R China;

    Harbin Inst Technol Sch Phys Harbin 150001 Heilongjiang Peoples R China;

    Harbin Inst Technol Lab Space Environm & Phys Sci Harbin 150001 Heilongjiang Peoples R China;

    Harbin Inst Technol Sch Phys Harbin 150001 Heilongjiang Peoples R China;

    Harbin Inst Technol Sch Phys Harbin 150001 Heilongjiang Peoples R China|Harbin Inst Technol Lab Space Environm & Phys Sci Harbin 150001 Heilongjiang Peoples R China;

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