A metallic phase in lightly doped La${}_{2-x}$Sr${}_x$CuO${}_4$ observed by electron paramagnetic resonance

Abstract

In the low doping range of $x$ from 0.01 to 0.06 in La${}_{2-x}$Sr${}_x$CuO${}_4$, a narrow electron paramagnetic resonance (EPR) line has been investigated. This line is distinct from the known broad line, both due to probing Mn${}^{2+}$ ions. The narrow line is ascribed to metallic regions in the material, and its intensity increases exponentially upon cooling below $\sim$ 150 K. The activation energy deduced $\Delta$ = 460(50) K is nearly the same as that found in the doped superconducting regime by Raman and neutron scattering. The intensity of the narrow EPR line follows the same temperature dependence as the resistivity anisotropy in lightly doped La${}_{2-x}$Sr${}_x$CuO${}_4$ single crystals.

arXiv comment4 pages, 4 figures

References in corpus (7)

• Electrical Resistivity Anisotropy from Self-Organized One-Dimensionality in High-Temperature Superconductors
• Nodal metallic behavior of lightly-doped La${}_{2-x}$Sr${}_x$CuO${}_4$
• The attainable superconducting Tc in a model of phase coherence by percolation
• Why stripes? Spontaneous formation of inhomogeneous structures due to elastic interactions
• Finite-wavevector Jahn-Teller-pairing and superconductivity in the cuprat es
• Charge ordering and long-range interactions in layered transition metal oxides
• Raman Scattering versus Infrared Conductivity: Evidence for one-dimensional Conduction in La_{2-x}Sr_{x}CuO_{4}

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