Evolution of the spin resonance of CeCoIn${}_5$ as a function of magnetic field and La substitution

Abstract

We report the evolution of the spin resonance in CeCoIn${}_5$ as a function of magnetic field and lanthanum substitution. In both cases, the resonance peak position shifts to lower energy and the lineshape broadens. For La doping, it is found that the ratio ${\Omega }_{res}/k_B{T}_c$ is almost constant as a function of $x$. Under magnetic field the decrease of the excitation energy is similar for H// [1,$\bar{1}$,0] and [1,1,1] and faster than the decrease of $T_c(H)$. The Zeeman effect found for the field applied along [1,$\bar{1}$,0] corresponds to the ground state magnetic moment.

Proc. Int. Workshop Neutron Applications on Strongly Correlated Electron Systems, 2011

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Cited by in corpus (3)

• Robust Upward Dispersion of the Neutron Spin Resonance in the Heavy Fermion Superconductor Ce${}_{1-x}$Yb${}_x$CoIn${}_5$
• From Ising resonant fluctuations to static uniaxial order in antiferromagnetic and weakly superconducting CeCo(In${}_{1-x}$Hg${}_x$)${}_5$ ($x$=0.01)
• Magnetic neutron scattering studies on the Fe-based superconductor system Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$