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首页> 外文OA文献 >Identification of spin wave resonances and crystal field levels in simple chromites RCrO3 (R = Pr, Sm, Er) at low temperatures in the THz spectral region
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Identification of spin wave resonances and crystal field levels in simple chromites RCrO3 (R = Pr, Sm, Er) at low temperatures in the THz spectral region

机译：自旋波共振和晶体场跃迁的识别  简单的铬铁矿RCrO3（R = pr，sm，Er）在太赫兹的超低温度下  光谱区域

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We report on THz absorption spectroscopy combined with high magnetic fieldsof polycrystalline RCrO3 (R= Pr, Sm, Er) aiming understanding spin waveresonances at their low temperature magnetic phases. Our measurements show thatthe temperature, and the implicit anisotropies at which the Cr3+ spinreorientation at TSR takes place, are determinant on the ferromagnetic-like(FM) and the antiferromagnetic-like (AFM) spin modes being optically active. Itis found that they are dependent on Rare Earth 4f moment and ion size. We alsostudied temperature and field dependence of crystal field levels in the samespectroscopic region. Pr3+ non-Kramers emerges at 100 K and Zeeman splits. Anobserved absence of spin wave resonances in PrCrO3 is attributed to Pr3+remaining paramagnetic. In SmCrO3 near cancelation of the spin and orbitalmoments is proposed as the possible reason for not detecting Sm3+ ground statetransitions. Here, the FM and AFM resonant modes harden when the temperaturedecreases and split linearly on applied fields at 5 K and below. In ErCrO3 theEr3+ Kramers doublet becomes active at about the TSR onset. Each line furtherexperiences Zeeman splitting under magnetic fields while an spin reversalinduced by a 2.5 T field, back to the Gamma4 (Fz) from the Gamma1 phase at 2 K,produces a secondary splitting. The 5 K AFM and FM excitations in ErCrO3 have aconcerted frequency-intensity temperature dependence and a shoulder pointing tothe Er3+ smaller ion size also disrupting the two magnetic sublatticeapproximation . Both resonances reduce to one when the temperature is loweredto 2 K in the Gamma1 representation.
机译：我们报告了Thz吸收光谱与多晶RCRO3（R = PR，SM，ER）的高磁场结合，旨在了解其低温磁相的旋转波浪。我们的测量表明，温度和隐式各向异性发生在TSR的CR3 +纺丝剂发生的内隐，是铁磁样（FM）和反铁磁性（AFM）旋转模式在光学活性的决定因素。 ITIS发现它们依赖于稀土4F时刻和离子尺寸。我们在SAMESSECTOPOPIC区域中的晶体场水平的恒温和场依赖性。 Pr3 +非克拉姆斯出现在100 k和塞曼分裂。在PRCRO3中缺乏旋转波共振的缺失归因于PR3 +剩余的顺磁性。在Smcro3附近取消旋转和OrbitalMoments作为未检测到SM3 +地面陈述的可能原因。这里，FM和AFM谐振模式在温度分泌并在施加的田地上线性地分开在5 k及以下时。在Ercro3中，Theer3 + Kramers Doublet在TSR发作时变得有效。每条线梗塞栖息在磁场下分裂，同时由2.5吨字段突出的旋转，从2 k处从伽马1相回到γ4（FZ），产生二级分裂。 ercro3中的5 k AFM和FM激发具有焦点的频率强度温度依赖性，并且肩部指向ER3 +较小的离子大小也破坏了两个磁性Sublatticapproximation。当温度降低到伽马1表示中时，两个共振减少到一个。

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