Magnetic field dependence and bottlenecklike behavior of the ESR spectra in YbRh2Si2

Magnetic field dependence and bottlenecklike behavior of the ESR spectra in YbRh2Si2
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YbRh2Si2 中 ESR 光谱的磁场依赖性和瓶颈行为

DOI:
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发表时间:
2009
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通讯作者:
S. Oseroff
S. Oseroff
中科院分区:
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文献类型:
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作者:
J. Duque;E. M. Bittar;C. Adriano;C. Giles;L. Holanda;R. Lora;P. Pagliuso;C. Rettori;C. A. Pérez;R. Hu;C. Petrovic;S. Maquilon;Z. Fisk;D. Huber;S. Oseroff

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在近藤晶格(TK ~(25)K)YbRh_2Si_2单晶化合物中,在不同磁场或频率(4.1≤ν≤34.4 GHz)下的电子自旋共振(ESR)实验证实了在4.2 μ T ~(20)K下观察到的g_(?)c ~(?)3.55的各向异性Dysonian共振,并且没有超精细成分。然而,我们的研究不同地揭示了:(i)H c的ESR谱显示出强场依赖的自旋-晶格弛豫,(ii)弱场和温度依赖的有效g值,(iii)超过15%的Lu掺杂的ESR强度的急剧抑制,以及(iv)ESR数据的强样品和Lu掺杂(≤15%)依赖性。这些结果表明,一个不同的情况下,ESR信号可能与耦合Yb 3+传导电子共振集体模式具有强大的瓶颈和dynamiclike行为。2009年美国物理学会。
Electron spin resonance (ESR) experiments at different fields or frequencies (4.1≤ν≤34.4 GHz) in the Kondo lattice (TK ≃25 K) YbRh2Si2 single-crystal compounds confirmed the observation of a single anisotropic Dysonian resonance with g⊥c ≅3.55 and no hyperfine components for 4.2≲T≲20 K. However, our studies differently reveal that (i) the ESR spectra for H⊥c show strong-field-dependent spin-lattice relaxation, (ii) a weak-field and temperature-dependent effective g value, (iii) a dramatic suppression of the ESR intensity beyond 15% of Lu doping, and (iv) a strong sample and Lu-doping (≤15%) dependence of the ESR data. These results suggest a different scenario where the ESR signal may be associated to a coupled Yb3+-conduction electron resonant collective mode with a strong bottleneck and dynamiclike behavior. © 2009 The American Physical Society.