Heat capacity and critical behavior of hexagonalYMnO3
Heat capacity and critical behavior of hexagonalYMnO3
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DOI：
10.1103/physrevb.72.064434
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发表时间：
2005-08
影响因子：
3.7
通讯作者：
M. Tachibana;J. Yamazaki;H. Kawaji;T. Atake
中科院分区：
文献类型：
--
作者：
M. Tachibana;J. Yamazaki;H. Kawaji;T. Atake
We report heat capacity $({C}_{p})$ measurements on high-quality single crystals of hexagonal $\mathrm{Y}\mathrm{Mn}{\mathrm{O}}_{3}$, a ferroelectric and frustrated triangular antiferromagnetic (AF) compound. The obtained values of the critical exponent $\ensuremath{\alpha}$ and amplitude ratio ${A}^{+}∕{A}^{\ensuremath{-}}$ for the AF transition are in good agreement with the standard three-dimensional Heisenberg universality class, and not with a chiral universality class associated with the 120\ifmmode^\circ\else\textdegree\fi{} spin structure. The low-temperature ${C}_{p}$ deviation from the Debye law can be adequately fitted with a single Einstein contribution, indicating that there is no evidence of the anomalous magnetic contributions reported earlier. We also suggest that there is no intrinsic linear term in the low-temperature ${C}_{p}$. These results are consistent with conventional long-range AF ordering in $\mathrm{Y}\mathrm{Mn}{\mathrm{O}}_{3}$.
We report heat capacity $({C}_{p})$ measurements on high-quality single crystals of hexagonal $\mathrm{Y}\mathrm{Mn}{\mathrm{O}}_{3}$, a ferroelectric and frustrated triangular antiferromagnetic (AF) compound. The obtained values of the critical exponent $\ensuremath{\alpha}$ and amplitude ratio ${A}^{+}∕{A}^{\ensuremath{-}}$ for the AF transition are in good agreement with the standard three-dimensional Heisenberg universality class, and not with a chiral universality class associated with the 120\ifmmode^\circ\else\textdegree\fi{} spin structure. The low-temperature ${C}_{p}$ deviation from the Debye law can be adequately fitted with a single Einstein contribution, indicating that there is no evidence of the anomalous magnetic contributions reported earlier. We also suggest that there is no intrinsic linear term in the low-temperature ${C}_{p}$. These results are consistent with conventional long-range AF ordering in $\mathrm{Y}\mathrm{Mn}{\mathrm{O}}_{3}$.