| Autor: |
Holanda, L. M., Vargas, J. M., Rettori, C., Nakatsuji, S., Kuga, K., Fisk, Z., Oseroff, S. B., Pagliuso, P. G. |
| Rok vydání: |
2009 |
| Předmět: |
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| Druh dokumentu: |
Working Paper |
| Popis: |
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. |
| Databáze: |
arXiv |
| Externí odkaz: |
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