Retraction: Bulk superconductivity and fully gapped superconducting state in Ba-doped phenanthrene [Phys. Rev. B 85, 214520 (2012)]

Figure 1

Comparison of measured and simulated x-ray diffraction profiles showing (a) (I) the data collected on a laboratory diffractometer using a $\mathrm{Mo}-K_{\alpha }$ source (same as in Fig. 1 of our paper), (II) high-resolution synchrotron diffraction pattern of the same sample, collected on beamline ID31, European Synchrotron Radiation Facility (ESRF), Grenoble ($\lambda =0.399837\AA$), (III) a simulated pattern calculated for hcp lanthanum [space group $P{6}_3/mmc,a=3.77$ and $c=12.159\AA$ (Ref. 2)] with a March-preferred orientation and anisotropic peak broadening applied in the (0 0 4) direction (March coefficient $=$ 0.9), and (IV) a simulated pattern calculated for phenanthrene ($P{2}_1,a=8.462,b=6.164,c=9.479\AA$, and $\beta =98.{07}^{\circ }$) with a March-preferred orientation in the (2 0 0) and (0 0 1) directions (March coefficients 0.35 and 0.58, respectively). (b) Zoom of the highest intensity peaks showing the clear similarities between the high-resolution pattern and that of hcp lanthanum.

Figure 2

Temperature dependence of (a) the specific heat $C/T$ and (b) the electronic specific heat $\Delta C/T=C/T\left(0\mathrm{T}\right)-C/T(H>H_{c2})$, where $H_{c2}$ is the upper critical field for the present sample and for hcp lanthanum.[3] Here, for the present sample, the atomic weight of elemental La is used rather than the molecular weight of Ba-doped phenanthrene.