Bose Fluids Above Tc

TL;DR

This paper discusses how Bose fluids above their critical temperature exhibit unique non-linear susceptibilities due to missing terms in traditional models, explaining recent experimental observations in solid helium and cuprate superconductors.

Contribution

It identifies missing terms in the conventional Hamiltonian for Bose fluids, providing a new explanation for observed susceptibilities above Tc.

Findings

Non-linear rotational susceptibility observed above Tc

Incompressible response to vorticity in Bose fluids

Model modifications explain recent experimental results

Abstract

This paper emphasizes that non-linear rotational or diamagnetic susceptibility is characteristic of Bose fluids above their superfluid Tcs. For sufficiently slow rotation or, for superconductors, weak B-fields this amounts to an incompressible response to vorticity. The cause is that there are terms missing 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.