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Fermi Surface Variation Near Quantum Critical Point Of CeRu2(Si1-xGex )2 Studied By Resonant ARPEST. Okane.pdf

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Summary

CeRu2Si2 is a heavy-fermion compound with a paramagnetic ground state, characterized by a large specific heat coefficient and a Kondo crossover temperature of ~20-25 K. Substitution of Ge for Si induces a magnetic ground state, with antiferromagnetism for x = 0.07-0.57 and ferromagnetism for x = 0.57-1.0.

The quantum critical point (QCP) is estimated to be at xc = 0.07, where the Ce 4f electrons may transform from itinerant to localized electrons. To investigate the Fermi surface (FS) variation near the QCP, soft X-ray angle-resolved photoelectron spectroscopy (ARPES) was performed on CeRu2Si2 and CeRu2(Si0.82Ge0.18)2.

The ARPES results show that the FSs of CeRu2Si2 and CeRu2(Si0.82Ge0.18)2 are similar, with a large circular FS surrounding the Z point. However, the on-resonance ARPES images reveal a new FS, assigned to the hole FS of band 4, which includes the largest contribution of the Ce 4f electrons.

The observation of the 4f-delocalized regime in both CeRu2Si2 and CeRu2(Si0.82Ge0.18)2 indicates that the 4f-delocalized regime extends beyond the critical composition xc. The absence of FS change near xc implies that the spin-density-wave model is suitable for the quantum criticality of CeRu2(Si1-xGex)2.

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CeRu2Si2 is a heavy-fermion compound with a paramagnetic ground state, characterized by a large specific heat coefficient and a Kondo crossover temperature of...

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  • File Size: 1.24 MB
  • Pages: 2
  • Language: EN
  • Author: kana
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