Competition and/or Coexistence of Antiferromagnetism and Superconductivity in CeRhIn$_5$ and CeCoIn$_5$

Details Competition and/or Coexistence of Antiferromagnetism and Superconductivity in CeRhIn$_5$ and CeCoIn$_5$ Competition and/or Coexistence of Antiferromagnetism and Superconductivity in CeRhIn$_5$ and CeCoIn$_5$

2009-08-27

arxiv.org/abs/0908.3980v1

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 7 figures, Manuscript for Proceedings of the International Conference on Quantum Criticality and Novel Phases (QCNP09

Scientific paper

The Ce compounds CeCoIn$_5$ and CeRhIn$_5$ are ideal model systems to study the competition of antiferromagnetism (AF) and superconductivity (SC). Here we discuss the pressure--temperature and magnetic field phase diagrams of both compounds. In CeRhIn$_5$ the interesting observation is that in zero magnetic field a coexistence AF+SC phase exist inside the AF phase below the critical pressure $p_{\rm c}^\star \approx 2$ GPa. Above $p_{\rm c}^\star$ AF is suppressed in zero field but can be re-induced by applying a magnetic field. The collapse of AF under pressure coincides with the abrupt change of the Fermi surface. In CeCoIn$_5$ a new phase appears at low temperatures and high magnetic field (LTHF) which vanishes at the upper critical field $H_{\rm c2}$. In both compounds the paramagnetic pair breaking effect dominates at low temperature. We discuss the evolution of the upper critical field under high pressure of both compounds and propose a simple picture of the glue of reentrant magnetism to the upper critical field in order to explain the interplay of antiferromagnetic order and superconductivity.

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