Magnetic-Field-Induced Localization of Quasiparticles in Underdoped La$_{2-x}$Sr$_x$CuO$_4$ Single Crystals

Details Magnetic-Field-Induced Localization of Quasiparticles in Underdoped La$_{2-x}$Sr$_x$CuO$_4$ Single Crystals Magnetic-Field-Induced Localization of Quasiparticles in Underdoped La$_{2-x}$Sr$_x$CuO$_4$ Single Crystals

2003-01-20

arxiv.org/abs/cond-mat/0301339v2

Phys. Rev. Lett. 90, 117004 (2003)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, final version published in PRL

Scientific paper

10.1103/PhysRevLett.90.117004

Magnetic-field-induced ordering of electrons around vortices is a striking phenomenon recently found in high-$T_c$ cuprates. To identify its consequence in the quasiparticle dynamics, the magnetic-field ($H$) dependence of the low-temperature thermal conductivity $\kappa$ of La$_{2-x}$Sr$_x$CuO$_4$ crystals is studied for a wide doping range. It is found that the behavior of $\kappa(H)$ in the sub-Kelvin region changes drastically across optimum doping, and the data for underdoped samples are indicative of unusual magnetic-field-induced localization of quasiparticles; this localization phenomenon is probably responsible for the unusual "insulating normal state" under high magnetic fields.

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