Negative Magnetoresistance in the Variable-Range-Hopping Transport of Strongly Underdoped La_{2-x}Sr_xCuO_4

• Authors: A Malinowski , M Cieplak , M Berkowski , S Guha
• Languages of publication: EN

Abstracts

EN

The in-plane transport of strongly underdoped La_{2-x}Sr_xCuO_4 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-hopping law may not be neglected and that the density of states at the Fermi level can be effectively expressed as g(E-E_F)=N_0 (E-E_F)^p, with a small exponent p of the order of 0.1. In the magnetic field parallel to CuO_2 planes one of the variable-range-hopping parameter,ρ_0, increases by about 20-25%, while the other one, T_0, decreases by about 10-15%, resulting in the decrease in total resistivity. This effect may be related to the decrease of the tunneling barrier between different antiferromagnetic clusters in the presence of magnetic field.

Keywords

EN

74.72.-h; 74.25.Fy; 73.43.Qt

Discipline

• 74.72.-h: Cuprate superconductors
• 73.43.Qt: Magnetoresistance(see also 75.47.-m Magnetotransport phenomena; materials for magnetotransport in magnetic properties and materials)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2006
• Volume: 109
• Issue: 4-5
• Pages: 611-615

Dates

published

2006-04

received

2005-09-25

Contributors

author

A Malinowski

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland

author

M Cieplak

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland

author

M Berkowski

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland

author

S Guha

• Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08885, USA

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Identifiers

DOI

10.12693/APhysPolA.109.611