Fermi surface of the heavy-fermion superconductor ${\mathrm{CeCoIn}}_5:$ The de Haas–van Alphen effect in the normal state

Measurements of the de Haas–van Alphen effect in the normal state of the heavy-fermion superconductor ${\mathrm{CeCoIn}}_5$ have been carried out using a torque cantilever at temperatures ranging from 20 to 500 mK and in fields up to 18 T. Angular-dependent measurements of the extremal Fermi surface areas reveal a more extreme two-dimensional sheet than is found in either ${\mathrm{CeRhIn}}_5$ or ${\mathrm{CeIrIn}}_5.$ The effective masses of the measured frequencies range from 9 to ${20m}^{*}{/m}_0.$