Dr. Anaelle Legros
, John Hopkins University
[Host: Utpal Chatterjee]
: The perfectly linear temperature dependence of the resistivity observed as T→0 in a variety of metals close to a quantum critical point is a major puzzle of condensed matter physics. In cuprates, this phenomenon is observed in the vicinity of the pseudogap critical point p*. Using high magnetic fields to suppress superconductivity, one can access the normal state properties down to T→0 close to this critical point. I will present high-field magneto-transport measurements of two hole-doped cuprates, near their respective p*, supporting that T-linear resistivity as T→0 is a generic property of cuprates, associated with a universal scattering rate. We measured the low-T resistivity of Bi2Sr2CaCu2O8+δ just above p*  and found that it exhibits a T-linear dependence, quantitatively similar to other very different cuprates. We also observed, using the Drude formula, that in various cuprates showing this low-T phenomenon the slope of this T-linear resistivity is given by a universal relation implying a specific scattering rate for charge carriers: 1/�� = αh/2πkBT (corresponding to what is called the Planckian limit ), where h is Planck’s constant, kB is the Boltzmann constant and α a constant of order unity. Finally, we directly measured the scattering rate in La1.6−xNd0.4SrxCuO4, just above p* and in the low-T limit, using angle-dependent magneto-resistance measurements : these experiments reveal an inelastic scattering rate which is isotropic and linear in temperature, and whose magnitude is consistent with Planckian dissipation.
 Legros et al., Nat. Phys. 15, 142 (2019)
 Zaanen, SciPost Phys. 6, 061 (2019)
 Grissonnanche et al., Nature 595, 667 (2021)
Condensed Matter Seminar
Thursday, December 9, 2021
Online, Room via Zoom
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