“Spin-polarized tunneling spectroscopic studies of the intrinsic heterogeneity and pseudogap phenomena in colossal magnetoresistive manganite La0.7Ca0.3MnO3” C. R. Hughes, J. Shi, A. D. Beyer, and N.-C. Yeh, Phys. Rev. B 82, 13441 (2010). [arXiv:1004.1448]
http://journals.aps.org/prb/abstract/10.1103/PhysRevB.82.134441