Microscopic Evidence for Preformed Cooper Pairs in Pressure-Tuned Organic Superconductors near Mott Transition

TL;DR

This study provides evidence that preformed Cooper pairs exist in pressure-tuned organic superconductors near the Mott transition, showing a pseudogap state that diminishes with pressure and magnetic field, indicating unconventional pairing above the superconducting transition.

Contribution

It demonstrates the presence of preformed Cooper pairs in organic superconductors near the Mott transition, distinct from conventional fluctuations, and explores their behavior under pressure and magnetic fields.

Findings

Pseudogap-like suppression of spin excitations near Mott transition

Pseudogap behavior is suppressed by pressure and magnetic field

Preformed Cooper pairs exist up to twice the critical temperature

Abstract

A weird electronic state accompanied with an anomalous superconducting precursor and/or exotic orders, called the pseudogap state, arises prior to a superconducting condensate in underdoped cuprates that are situated near Mott transition. Another way to make the system approach the Mott transition is the variation of bandwidth or correlation strength, which gives a new dimension to exploring this exotic state. Here we report nuclear magnetic resonance (NMR) studies on layered organic superconductors with half-filled bands whose widths are pressure-tuned near the Mott transition. The system situated on the verge of the Mott transition shows a pseudogap-like anomalous suppression of spin excitations on cooling from well above the superconducting critical temperature $T_{\mathrm{c}}$. The pressure variation of the NMR relaxation rate shows that the pseudogap-like behavior is rapidly suppressed by applying pressure. The NMR experiments under various magnetic fields varied up to 18 T proves the absence of symmetry breaking orders that compete with superconductivity, such as charge orders, in the metallic phase. Remarkably, the pseudogap-like behavior above $T_{\mathrm{c}}$ and the superconducting condensate fade out in parallel under ascending magnetic fields with similar field-orientation dependence, indicating a superconducting precursor is the predominant origin of the pseudogap. Our further investigation of different materials, which take different "distances" from the Mott transition by chemical pressure, confirms that the superconducting precursor is not the conventional amplitude fluctuations arising from low dimensionality but unconventional preformation of Cooper pairs enhanced near the Mott transition. These findings conclude that preformed Cooper pairs persist up to twice as high as $T_{\mathrm{c}}$ on the verge of the bandwidth-controlled Mott transition.