Critical behavior of the single-crystal helimagnet MnSi

Critical behavior of the single-crystal helimagnet MnSi
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单晶螺旋磁体 MnSi 的临界行为

DOI:
10.1103/physrevb.91.024403
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发表时间:
2015-01
期刊:
影响因子:
3.7
通讯作者:
Zhang Yuheng
Zhang Yuheng
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhang Lei;Menzel Dirk;Jin Chiming;Du Haifeng;Ge Min;Zhang Changjin;Pi Li;Tian Mingliang;Zhang Yuheng

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利用圆锥态和顺磁相界面处的体直流磁化法研究了单晶螺旋状MNSI的临界行为。我们得到了临界指数$(\ensuremath{\beta}=0.242\ifmmode\pm\else\textpm\fi{}0.006,\ensuremath{\gamma}=0.915\ifmmode\pm\else\textpm\fi{}0.003$,和$\ensuremath{\delta}=4.734\ifmmode\pm\else\textpm\fi{}0.006)$,,其中自洽和可靠性由Widom标度定律和标度方程验证。MNSI的临界指数属于三临界平均场理论的普适类,它明确地表明在外加磁场诱导的一阶相变和二阶相变的交界处存在三临界现象。在临界温度下,三临界点(Tcp)被确定为${H}_{Mathm{Tcp}}\EnsureMATH3200$Oe,这与先前的报道一致[A.Bauer,M.Garst,和C.Pfleider,Phys.莱特牧师。110、177207(2013年)]。临界行为表明存在长程磁耦合,交换距离在MnSi中衰减为$J(r)\ensuremath{\approx}{r}^{\ensuremath{-}4.3}$。
The critical behavior of the single-crystal helimagnet MnSi is investigated by means of bulk dc magnetization at the boundary between the conical state and paramagnetic phase. We obtain the critical exponents $(\ensuremath{\beta}=0.242\ifmmode\pm\else\textpm\fi{}0.006,\ensuremath{\gamma}=0.915\ifmmode\pm\else\textpm\fi{}0.003$, and $\ensuremath{\delta}=4.734\ifmmode\pm\else\textpm\fi{}0.006)$, where the self-consistency and reliability are verified by the Widom scaling law and the scaling equation. The critical exponents of MnSi belong to the universality class of tricritical mean-field theory, which unambiguously indicates a tricritical phenomenon at the boundary between the first-order phase transition and the second-order one induced by the external magnetic field. The tricritical point (TCP) is determined as ${H}_{\mathrm{TCP}}\ensuremath{\approx}3200$ Oe at the critical temperature, consistent with the previous report [A. Bauer, M. Garst, and C. Pfleiderer, Phys. Rev. Lett. 110, 177207 (2013)]. The critical behavior suggests a long-range magnetic coupling with the exchange distance decaying as $J(r)\ensuremath{\approx}{r}^{\ensuremath{-}4.3}$ in MnSi.
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