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. 2015 Mar 3;112(11):3285–3289. doi: 10.1073/pnas.1421174112

Fig. 3.

Fig. 3.

Compressional resonances in three unconventional superconductors. Resonance modes dominated by the scalar moduli are shown for (A) PuCoGa5, (B) CeCoIn5, and (C) YBa2Cu3O6.60. Although all three materials show a discontinuity at Tc and all stiffen immediately below Tc, only PuCoGa5 shows the dramatic softening above Tc.