Large magnetodielectric effects in orthorhombic HoMnO3 and YMnO3

B. Lorenz, Y. Q. Wang, Y. Y. Sun, C. W. Chu

研究成果: Article同行評審

209 引文 斯高帕斯(Scopus)

摘要

We have found a remarkable increase (up to 60%) of the dielectric constant with the onset of magnetic order at 42 K in the metastable orthorhombic structures of YMnO3 and HoMnO3 that proves the existence of a strong magnetodielectric coupling in the compounds. Magnetic, dielectric, and thermodynamic properties show distinct anomalies at the onset of the incommensurate magnetic order and thermal hysteresis effects are observed around the lock-in transition temperature at which the incommensurate magnetic order locks into a temperature independent wave vector. The Mn3+ spins and Ho3+ moments both contribute to the magnetodielectric coupling. A large magnetodielectric effect was observed in HoMnO3 at low temperature where the dielectric constant can be tuned by an external magnetic field resulting in a decrease of up to 8% at 7 T. By comparing data for YMnO3 and HoMnO3 the contributions to the coupling between the dielectric response and Mn and Ho magnetic moments are separated.

原文English
文章編號212412
頁(從 - 到)1-4
頁數4
期刊Physical Review B - Condensed Matter and Materials Physics
70
發行號21
DOIs
出版狀態Published - 2004 12月

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學

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