Microscopic phase separation and two types of quasiparticles in lightly doped La2-xSrxCuO4 observed by electron paramagnetic resonance (in English)
Abstract
In the low doping range of x from 0.01 to 0.06 in La2-xSrxCuO4 , we observed two electron paramagnetic resonance (EPR) signals: a narrow and a broad one. The narrow line is ascribed to metallic regions in the material, and its intensity increases exponentially upon cooling below ~ 150 K. The activation energy deduced ∆ = 460(50) K is nearly the same as that found in the doped superconducting regime by Raman and neutron scattering. Obtained results provide evidence of the microscopic phase separation and two type of quasiparticles in lightly doped La2-xSrxCuO4.
Supporting agencies: This work is supported by SNSF under the grant 7IP062595, AS are partially supported by INTAS-01-0654 and CRDF REC-007.
About the Authors
A. Shengelaya
Physik-Institut der Universität Zürich
Switzerland
Switzerland
Zürich CH-8057
M. Bruun
Physik-Institut der Universität Zürich
Switzerland
Switzerland
Zürich CH-8057
K. A. Müller
Physik-Institut der Universität Zürich
Switzerland
Switzerland
Zürich CH-8057
A. Safina
Kazan State University
Russian Federation
Russian Federation
Kazan, 420008
K. Conder
ETH Zürich and PSI
Switzerland
Switzerland
CH-5232 Villigen PSI
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Review
For citations:
Shengelaya A., Bruun M., Müller K.A., Safina A., Conder K. Microscopic phase separation and two types of quasiparticles in lightly doped La2-xSrxCuO4 observed by electron paramagnetic resonance (in English). Magnetic Resonance in Solids. 2004;6(1):191-197.
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