Eletron Spin Resonance (ESR) experiments of Fe-doped YbAlB4 heavy fermion compounds

• DOI: 10.5196/physicae.proceedings.xejp.20
• Publication Date: 2011-07-22T12:26:08Z
• Authors: L.M. Holanda; P.G. Pagliuso; C. Rettori; S. Nakatsuji; K. Kuga

In this work we have performed Electron Spin Resonance (ESR) experiments on single crystals of Fe-doped YbAlB4 heavy fermion compounds. We explored the ESR measurements in X-band (η = 9,4 GHz). For β-YbAlB4, for and found a remarkable signal that behaves as conduction electron spin resonance (CESR) at high temperatures acquires characteristics Yb(3+) local moment low temperature. This behavior was not α-YbAlB4. The striking unique dual observed same spectra β-YbAlB4 associated to results α-YbAlB4 allowed us propose qualitative scenario may explain origin HF systems. speculate systems strongly coupled 4f c-e give “Kondo modes”, which behave CESR or LM ESR, depending strength Jf s . Moreover, near QCP propitious conditions present such signal.