Evidence for the existence of Kondo coupled resonant modes in heavy fermions

Evidence for the existence of Kondo coupled resonant modes in heavy fermions
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重费米子中近藤耦合谐振模式存在的证据

DOI:
--
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发表时间:
2009
期刊:
arXiv: Strongly Correlated Electrons
影响因子:
--
通讯作者:
P. Pagliuso
P. Pagliuso
中科院分区:
--
文献类型:
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作者:
L. Holanda;J. M. Vargas;C. Rettori;S. Nakatsuji;K. Kuga;Z. Fisk;S. Oseroff;P. Pagliuso

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电子自旋共振(ESR)可以在微观上探测不同材料中的传导电子(ce)和局域磁矩(LM)自旋系统。在基于轻元素或具有增强的泡利磁化率的金属系统中观察到ce自旋共振(CESR)。LM ESR通常见于具有顺磁性离子和局部d或f电子的化合物中。在这里,我们报告了一个显着的和前所未有的ESR信号在重费米子(HF)超导体beta-YbAlB 4 [1],其表现为CESR在高温下,并获得Yb 3 + LM ESR在低温下的特性。这种在同一ESR谱中的双重行为作为对近藤准粒子的原位独特观察,产生了一种新的ESR响应,称为近藤耦合共振模式(KCRM)。接近量子临界点(QCP)可能有利于KCRM的观察,其在β-YbAlB 4中的双重特性可能揭示QCP处的4f电子性质。
Electron Spin Resonance (ESR) can microscopically probe both conduction electrons (ce) and local moment (LM) spin systems in different materials. A ce spin resonance (CESR) is observed in metallic systems based on light elements or with enhanced Pauli susceptibility. LM ESR is frequently seen in compounds with paramagnetic ions and localized d or f electrons. Here we report a remarkable and unprecedented ESR signal in the heavy fermion (HF) superconductor beta-YbAlB4[1] which behaves as a CESR at high temperatures and acquires characteristics of the Yb3+ LM ESR at low temperature. This dual behavior in same ESR spectra strikes as an in situ unique observation of the Kondo quasiparticles giving rise to a new ESR response called Kondo coupled resonant mode (KCRM). The proximity to a quantum critical point (QCP) may favor the observation of a KCRM and its dual character in beta-YbAlB4 may unveil the 4f-electrons nature at the QCP.
重费米子体系β-YbA1B_4的量子临界性和超导性
DOI: --
发表时间: 2009
期刊:
影响因子: --
作者:
Ando M;et.al.;E. Saitoh;Tatsuya Higashi;Satoru Nakatsuji
通讯作者: Satoru Nakatsuji
DOI: --
发表时间: 2006
期刊: J. Phys. Soc. Jpn. 75
影响因子: --
作者:
Takahiro Maehira;Takashi Hotta;藤井敏之;福井隆裕・初貝安弘;Takashi Hotta;N. Hatakenaka;福井隆裕・初貝安弘;Takashi Hotta and Hisatomo Harima;S. Matsuo;Katsunori Kubo and Takashi Hotta
通讯作者: Katsunori Kubo and Takashi Hotta