CeCoIn5 ("Cerium-Cobalt-Indium 5") is a heavy-fermion superconductor with a layered crystal structure, with somewhat two-dimensional electronic transport properties.
Closely related to CeCoIn5 is the heavy-fermion material CeRhIn5, which has the same crystal structure and which orders antiferromagnetically below 4K, but does not become superconducting at ambient pressure.
[8][9] Growth of single-crystalline CeCoIn5 has been very successful soon after the discovery of the material, and large single crystals of CeCoIn5, such as required for inelastic neutron scattering, have been prepared.
The upper critical magnetic field Hc2 of the superconducting state of CeCoIn5 is anisotropic, in accordance with the crystal structure and other physical properties.
For magnetic fields applied along the [100] direction, Hc2 amounts to approximately 11.6 T, and Hc2 for fields along the [001] directions to 4.95 T.[10] The superconducting order parameter has d-wave symmetry, as established by several experiments,[11][12] such as scanning tunneling microscopy (STM) and spectroscopy (STS).