Experimental Detection of the Gravitomagnetic London Moment

TL;DR

This paper reports the first laboratory detection of a measurable gravitomagnetic field generated by a rotating superconductor, supporting theories that link superconductivity with gravitomagnetic effects and opening new avenues for testing general relativity.

Contribution

It provides experimental evidence for a gravitomagnetic London moment in superconductors, a phenomenon previously only theorized, demonstrating a new method to explore gravitational effects in quantum materials.

Findings

Detected a gravitomagnetic field proportional to angular acceleration.

Observed acceleration fields of about 10^-4 g outside the superconductor.

Confirmed the theoretical prediction of a gravitomagnetic London moment.

Abstract

It is well known that a rotating superconductor produces a magnetic field proportional to its angular velocity. The authors conjectured earlier, that in addition to this so-called London moment, also a large gravitomagnetic field should appear to explain an apparent mass increase of Niobium Cooper-pairs. This phenomenon was indeed observed and induced acceleration fields outside the superconductor in the order of about 10^-4 g were found. The field appears to be directly proportional to the applied angular acceleration of the superconductor following our theoretical motivations. If confirmed, a gravitomagnetic field of measurable magnitude was produced for the first time in a laboratory environment. These results may open up a new experimental window on testing general relativity and its consequences using coherent matter.