Charge-carrier density collapse in La0.67Ca0.33MnO3 and La0.67Sr0.33MnO3 epitaxial thin films W. Westerburg, F. Martin, P. J.M. van Bentum, J. A.A.J. Perenboom and G. Jakob Eur. Phys. J. B, 14 3 (2000) 509-513 Published online: 15 April 2000 DOI: 10.1007/s100510051059