Bose Fluids Above Tc: Incompressible Vortex Fluids and "Supersolidity"

TL;DR

This paper proposes that Bose fluids above their superfluid transition temperature exhibit an incompressible vortex fluid state with characteristic susceptibility, explaining recent experimental observations in solid helium and cuprate superconductors.

Contribution

It identifies a missing term in the vortex Hamiltonian that accounts for incompressible vortex fluid behavior above Tc, linking theory to experiments.

Findings

Incompressible vortex fluid behavior observed above Tc.

Susceptibility explained by modified vortex Hamiltonian.

Connections to experimental results in helium and cuprates.

Abstract

This paper emphasizes that non-linear rotational or diamagnetic susceptibility is characteristic of Bose fluids above their superfluid Tcs, and for sufficiently slow rotation or weak B-fields amounts to an incompressible response to vorticity. The cause is a missing term in the conventionally accepted model Hamiltonian for quantized vortices in the Bose fluid. The resulting susceptibility can account for recent observations of Chan et al on solid He, and Ong et al on cuprate superconductors.