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首页> 外文期刊>Bulletin of the American Physical Society >APS -APS March Meeting 2017 - Event - Quasi-1D heavy fermion magnet Yb$_2$Pt$_2$Pb in Magnetic Field
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APS -APS March Meeting 2017 - Event - Quasi-1D heavy fermion magnet Yb$_2$Pt$_2$Pb in Magnetic Field

机译:APS -APS 2017年3月会议-活动-准1维重型费米子磁体Yb $ _2 $ Pt $ _2 $ Pb在磁场中

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The Yb$^{3+}$ ions in Yb$_2$Pt$_2$Pb form large, seemingly classical Ising magnetic moments, with the large spin-orbit coupling of the 4f-electrons and the crystal electric field forming a $J=pm 7/2$ Yb ground state doublet [1]. However, from this unlikely host, emerges a continuum of quantum excitations -- spinons on one dimensional chains -- in good agreement with the behavior expected for nearly isotropic, $S=pm 1/2$, d-electron magnetic moments [2]. These spinons, in a system with orbitally dominated magnetic constituents, are robust and at low temperatures exist up to 2.3 T, when all Yb magnetic moments become saturated. In magnetic fields larger than 0.5 T, the spinon gap is closed, modifying the quantum continuum through the formation of a fermi surface and spinon bound states between the Yb chains. The ground state doublet nature of the Yb ions ensures that at all fields, transverse excitations are virtually nonexistent, giving unprecedented access to only the longitudinal excitation channel without the presence of spin waves or other transverse damping mechanisms.ewline[1] M. S. Kim, extit{et al.}, extit{Phys. Rev. B.} extbf{77}, 144425 (2008); K. Iwakawa extit{et al.}, extit{J. Phys. Soc. Jpn.} extbf{81}, SB058 (2012);Y. Shimura extit{et al.}, extit{J. Phys. Soc. Jpn.} extbf{81} 103601 (2012); M. S. Kim and M. C. Aronson, extit{Phys. Rev. Lett} extbf{110}, 017201 (2013); W. Miiller extit{et al.}, extit{Phys. Rev. B} extbf{93}, 104419 (2016).[2] L. S. Wu extit{et al.}, extit{Science} extbf{352}, 1206 (2016).
机译:Yb $ _2 $ Pt $ _2 $ Pb中的Yb $ ^ {3 +} $离子形成看似经典的Ising磁矩,并带有4f电子的大自旋轨道耦合和晶体电场,形成$ J = pm 7/2 $ Yb基态双峰[1]。然而,从这个不太可能的宿主中,出现了一个连续的量子激发-一维链上的自旋子-与几乎各向同性,$ S = pm 1/2 $,d电子磁矩的预期行为相吻合[2] 。当所有Yb磁矩都饱和时,在具有轨道支配磁性成分的系统中,这些自旋是坚固的,并且在低温下存在的温度高达2.3T。在大于0.5 T的磁场中,自旋间隙被封闭,通过形成费米表面和Yb链之间的自旋束缚态来改变量子连续体。 Yb离子的基态二重态性质确保了在所有场上几乎都不存在横向激发,从而空前地仅进入纵向激发通道而没有自旋波或其他横向阻尼机制。ewline[1] MS Kim,extit {et al。},退出{Phys。修订版B.} extbf {77},144425(2008); K. Iwakawa extit {et al。},extit {J。物理Soc。 Jpn。} extbf {81},SB058(2012);是。 Shimura extit {et al。},extit {J。物理Soc。 Jpn。} extbf {81} 103601(2012); M. S. Kim和M. C. Aronson,现成{Phys。 Revt Lett} extbf {110},017201(2013); W. Miiller退出{et al。},退出{Phys。修订版B} extbf {93},104419(2016)。[2] L.S. Wu extit {et al。},extit {Science} extbf {352},1206(2016)。

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