Negative Magnetoresistance in the Variable-Range-Hopping Transport of Strongly Underdoped La2-xSrxCuO4

Negative Magnetoresistance in the Variable-Range-Hopping Transport of Strongly Underdoped La2−xSrxCuO4

The in-plane transport of strongly underdoped La2−xSrxCuO4 films was examined in the magnetic fields up to 14 T and in temperatures down to 1.6 K. While at high temperatures the samples display metallic-like resistivity, the low-T transport is governed by variable-range-hopping mechanism. Careful analysis shows that the temperature dependence of pre-exponential factor in Mott’s variable-range-h...

Orbital Magnetoresistance in the La2−xSrxCuO4 System

Measurements of resistivity, Hall effect, and magnetoresistance have been made on seven c–axis oriented thin–film specimens of La2−xSrxCuO4 with values of x from 0.048 to 0.275, and one specimen that also contains Nd. The orbital magnetoresistance is found not to be proportional to the square of the tangent of the Hall angle except for values of x near 0.15 above about 80K. For smaller values o...

Microscopic Charge Inhomogeneities in Underdoped La2 xSrxCuO4: Local Structural Evidence

We present local structural evidence for the existence of charge inhomogeneities at low temperature in underdoped and optimally doped La2 xSrxCuO4. The inhomogeneities disappear for x 0.2. The evidence for the charge inhomogeneities comes from an anomalous increase in the inplane Cu–O bond length distribution in the underdoped samples as well as evidence for CuO6 octahedral tilt inhomogeneities...

Field-Induced Thermal Metal-to-Insulator Transition in Underdoped La2 xSrxCuO4

Field-Induced Thermal Metal-to-Insulator Transition in Underdoped La2 xSrxCuO4 D. G. Hawthorn, R.W. Hill, C. Proust,* F. Ronning, Mike Sutherland, Etienne Boaknin, C. Lupien, M. A. Tanatar, Johnpierre Paglione, S. Wakimoto, H. Zhang, Louis Taillefer, T. Kimura, M. Nohara, H. Takagi, and N. E. Hussey Department of Physics, University of Toronto, Toronto, Ontario, Canada Department of Advanced Ma...

Paraconductivity of underdoped La2-xSrxCuO4 thin-film superconductors using high magnetic fields