Many-body electronic structure in the pyrochlore superconductor <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>Cs</mml:mi> <mml:msub> <mml:mi>Bi</mml:mi> <mml:mn>2</mml:mn> </mml:msub> </mml:mrow> </mml:math> and spin-li

The authors present here the first atomic-scale investigation of the pyrochlore superconductor CsBi${}_{2}$ and the spin liquid Pr${}_{2}$Ir${}_{2}$O${}_{7}$ using scanning tunneling microscopy at 300 mK. The many-body electronic structure, including strong-coupling superconductivity and homogeneous Kondo-lattice resonance, are imaged. They further find unusual excitations, including vortex core states with threefold symmetry and site-dependent Zeeman splitting of the Kondo resonance, which provide atomic insight into the interplay between geometrical frustration and many-body phenomena in this pyrochlore lattice.