  The propagation of electromagnetic fields in matter has been the subject of
intensive studies since the discovery of its rich dynamics. Impedance
measurements are one most used technique available to study material properties
as well as electromagnetic devices and circuits. This way, novelties on device
construction and circuit technology associated to new material properties
and/or unusual field dynamics generally rely on results supported by impedance
data. Recent advances on nanostructured materials explore astounding molecular
properties derived from nanoscale levels and apply them to studies foucused on
the generation of new devices. Accordingly, properties inherent to quantum
dynamics can also generate unusual circuit elements, not included on the former
development of the electromagnetic theory. On same footings, advances in field
dynamics could also determine the advent of new technologies, producing
immediate impact on our everyday life. In this work we present the results
obtained by measuring the impedance of single spires and coils of specific
geometry in the MHz range. They demonstrate that a new passive circuit element
was found, which bears out the existence of an as yet unobserved propagation
mode of the electromagnetic fields in matter. Our results also indicates that
this effect is more evident using carbon made spires.
