# Strange metal behaviour from charge density fluctuations in cuprates

## TL;DR

This paper proposes that charge density fluctuations are the microscopic mechanism behind the strange metallic state in cuprates, explaining their anomalous electron and transport properties above the pseudogap temperature.

## Contribution

It provides a microscopic explanation linking charge density fluctuations to strange metal behavior in cuprates, supported by experimental and theoretical analysis.

## Key findings

- Charge density fluctuations extend above T* in cuprates.
- These fluctuations can account for strange metal phenomenology.
- Charge density fluctuations are likely the microscopic origin of the strange metallic state.

## Abstract

Besides the mechanism responsible for high critical temperature superconductivity, the grand unresolved issue of the cuprates is the occurrence of a strange metallic state above the so-called pseudogap temperature $T^*$. Even though such state has been successfully described within a phenomenological scheme, the so-called Marginal Fermi-Liquid theory, a microscopic explanation is still missing. However, recent resonant X-ray scattering experiments identified a new class of charge density fluctuations characterized by low characteristic energies and short correlation lengths, which are related to the well-known charge density waves. These fluctuations are present over a wide region of the temperature-vs-doping phase diagram and extend well above $T^*$. Here we investigate the consequences of charge density fluctuations on the electron and transport properties and find that they can explain the strange metal phenomenology. Therefore, charge density fluctuations are likely the long-sought microscopic mechanism underlying the peculiarities of the metallic state of cuprates.