Effects of La non-magnetic impurities on the spin resonance of CeCoIn$_{5}$

Details Effects of La non-magnetic impurities on the spin resonance of CeCoIn$_{5}$ Effects of La non-magnetic impurities on the spin resonance of CeCoIn$_{5}$

2011-01-05

arxiv.org/abs/1101.1018v1

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures

Scientific paper

The influence of La non magnetic impurities on the spin dynamics of CeCoIn$_{5}$ was studied by inelastic neutron scattering. In La-substituted systems, the spin resonance peak (observed at $\Omega_{res}=0.55 meV$ in the pure system) is shifted to lower energies but the ratio $\Omega_{res}/k_{B}T_{c}$ remains unchanged. The excitation broadens till it reaches 0.3 meV equal to the value of the quasi-elastic signal in the normal state. The evolution of La substitution is compared with the evolution of the magnetic resonance in Ni and Zn substituted YBa$_{2}$Cu$_{3}$O$_{7}$.

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