Doping evolution of the electronic specific heat coefficient in slightly-doped La2-xSrxCuO4 single crystals

Details Doping evolution of the electronic specific heat coefficient in slightly-doped La2-xSrxCuO4 single crystals Doping evolution of the electronic specific heat coefficient in slightly-doped La2-xSrxCuO4 single crystals

2008-08-27

arxiv.org/abs/0808.3671v1

J. Phys.: Conf. Ser. 150, 052118 (2009).

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, accepted for publication in Journal of Physics: Conference Series (LT25 proceeding)

Scientific paper

10.1088/1742-6596/150/5/052118

Detailed doping dependence of the electronic specific heat coefficient gamma is studied for La2-xSrxCuO4 (LSCO) single crystals in the slightly-doped regime. We find that gamma systematically increases with doping, and furthermore, even for the samples in the antiferromagnetic (AF) regime, gamma already acquires finite value and grows with x. This suggests that finite electronic density of states (DOS) is created in the AF regime where the transport shows strong localization at low temperatures, and this means the system is not a real insulator with a clear gap even though it still keeps long range AF order.

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