Nonlinear<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>c</mml:mi></mml:math>-axis transport in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Bi</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>Sr</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>CaCu</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mtext>O</mml:mtext><mml:mrow><mml:mn>8</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>from two-barrier tunneling

TL;DRAbstract

Motivated by the peculiar features observed through intrinsic tunneling spectroscopy of ${\text{Bi}}_{2}{\text{Sr}}_{2}{\text{CaCu}}_{2}{\text{O}}_{8+\ensuremath{\delta}}$ mesas in the normal state, we have extended the normal-state two-barrier model for the $c$-axis transport [M. Giura et al., Phys. Rev. B 68, 134505 (2003)] to the analysis of $dI/dV$ curves. We have found that the purely normal-state model reproduces all the following experimental features: (a) the parabolic $V$ dependence of $dI/dV$ in the high-$T$ region (above the conventional pseudogap temperature), (b) the emergence and the nearly voltage-independent position of the ``humps'' from this parabolic behavior by lowering the temperature, and (c) the crossing of the absolute $dI/dV$ curves at a characteristic voltage ${V}^{\ifmmode\times\else\texttimes\fi{}}$. Our findings indicate that conventional tunneling can be at the origin of most of the uncommon features of the $c$-axis transport in ${\text{Bi}}_{2}{\text{Sr}}

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