Abstract
We present specific heat measurements on single crystals which show an unexpected change in the field dependence of the electronic specific heat () from linear at to nonlinear at . We consider several possible explanations for this change and propose, as a possible interpretation, a phase transition in the symmetry of the order parameter from nodal (e.g., wave) at to gapped (e.g., wave) at . Such a phase transition could be an explanation for the previous conflicting experimental results on the pairing symmetry in the electron-doped cuprates.
- Received 30 January 2004
DOI:https://doi.org/10.1103/PhysRevLett.93.067001
©2004 American Physical Society