Linear resistivity in κ-(BEDT-TTF)<sub>2</sub>Cu(NCS)<sub>2</sub>
ORAL
Abstract
Many materials show strong electronic correlations where superconductivity competes with insulating states. Examples include cuprates, pnictides or heavy fermions as well as the low dimensional molecular compounds that are the subject of this presentation.
Our study focuses more specifically on the superconducting phase in two-dimensional molecular materials (κ-(BEDT-TTF)2X family) where we have observed in a wide range of magnetic fields and temperature an unexpected linear in temperature variation of the resistivity for the 2D molecular superconductor κ-(BEDT-TTF)2Cu(NCS)2 .This behavior is retained under pressure (P) and observed only below Tc0(P) where Tc0(P) is the zero magnetic field critical temperature at the pressure P.
Such a linear behavior is the subject of an intense activity in the framework of unconventional superconductivity: it has been observed in cuprates1, quasi-1D molecular conductors of the TMTSF family2 and even in twisted bilayer graphene3. In some of these compounds, this linear behavior of the resistivity ρ(T)=r0+AT has recently been attributed to a so-called Planckian diffusion of the carriers with a universal behavior of the slope A, in contrast to the expected quadratic behavior ρ(T)=r'0+BT2 associated to electron-electron interaction in the Fermi liquid theory.
In this presentation, we will present a careful analysis of the data in the title compound in the framework of this universal Planckian mechanism.
References:
Our study focuses more specifically on the superconducting phase in two-dimensional molecular materials (κ-(BEDT-TTF)2X family) where we have observed in a wide range of magnetic fields and temperature an unexpected linear in temperature variation of the resistivity for the 2D molecular superconductor κ-(BEDT-TTF)2Cu(NCS)2 .This behavior is retained under pressure (P) and observed only below Tc0(P) where Tc0(P) is the zero magnetic field critical temperature at the pressure P.
Such a linear behavior is the subject of an intense activity in the framework of unconventional superconductivity: it has been observed in cuprates1, quasi-1D molecular conductors of the TMTSF family2 and even in twisted bilayer graphene3. In some of these compounds, this linear behavior of the resistivity ρ(T)=r0+AT has recently been attributed to a so-called Planckian diffusion of the carriers with a universal behavior of the slope A, in contrast to the expected quadratic behavior ρ(T)=r'0+BT2 associated to electron-electron interaction in the Fermi liquid theory.
In this presentation, we will present a careful analysis of the data in the title compound in the framework of this universal Planckian mechanism.
References:
- [1]A. Legros, S. Benhabib, W. Tabis, et al. Universal T-linear resistivity and Planckian dissipation in overdoped cuprates. Nature Phys. 15, 142–147 (2019).
[2]Doiron-Leyraud, N., René de Cotret, S., Sedeki, A. et al. Linear-T scattering and pairing from antiferromagnetic fluctuations in the (TMTSF)2X organic superconductors. Eur. Phys. J. B 78, 23–36 (2010).
[3]Polshyn, H., Yankowitz, M., Chen, S. et al. Large linear-in-temperature resistivity in twisted bilayer graphene. Nat. Phys. 15, 1011–1016 (2019).
–
Presenters
-
Chaima Essghaier
Universite Paris-Saclay
Authors
-
Chaima Essghaier
Universite Paris-Saclay
-
Pascale Auban Senzier
Universite Paris Saclay - LPS
-
Claude Pasquier
Universite Paris Saclay - LPS