Collaborative Research: Collective Mode Spectroscopy in Unconventional Superconductors
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Collaborative Research: Collective Mode Spectroscopy in Unconventional Superconductors
John B. Ketterson, Northwestern University, DMR 0509357
Meander line
CeCoIn5
Pin Pout
CeCoIn5
We exploit a novel microwave transmission technique based on a copper-wire meander line to study the microwave absorption in CeCoIn5.
The measurement cell (shown in Fig. 1) consists of a meander line sandwiched between the two CeCoIn5 crystal platelets; the meander line itself is made from ordinary varnish-insulated Cu wire, 0.1 mm in diameter.
We have carried out a microwave study of single-crystal CeCoIn5, a
heavy-fermion material with a relatively high transition temperature, with the aim to study the spectrum of Order Parameter Collective Modes (OPCM).
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Normalized transmitted signal vs. temperature for the frequencies 2932, 5852, 6912, 8501, 9004, 10288, 15478, and 16194 MHz (curves from 1 to 8, respectively).
We have discovered a rather abrupt change in the character of the transmitted signal vs. temperature dependence at frequencies in the vicinity of 9 GHz, implying an increased absorption at higher frequencies. This corresponds to the opening of a new “dissipation channel” in CeCoIn5 at an energy in the range 35-40 eV.
We are currently performing tunneling experiments to study pairing symmetry in CeCoIn5.
Collaborative Research: Collective Mode Spectroscopy in Unconventional Superconductors
John B. Ketterson, Northwestern University, DMR 0509357