High pressure synthesis of late rare earth RFeAs(O,F) superconductors; R = Tb and Dy

TL;DR

This paper reports the high-pressure synthesis of new TbFeAs(O,F) and DyFeAs(O,F) superconductors with critical temperatures around 45-46 K and very high critical fields over 100 T, expanding the family of rare earth high-temperature superconductors.

Contribution

It demonstrates that high pressure can be used to synthesize late rare earth RFeAs(O,F) superconductors, which were previously difficult to produce.

Findings

Critical temperatures of 45-46 K for Tb and Dy compounds.

Critical fields exceeding 100 T.

Successful synthesis at 1100-1150°C and 10-12 GPa.

Abstract

New TbFeAs(O,F) and DyFeAs(O,F) superconductors with critical temperatures Tc= 46 and 45 K and very high critical fields over 100 T have been prepared at 1100- 1150C and 10-12 GPa, demonstrating that high pressure may be used to synthesise late rare earth derivatives of the recently reported RFeAs(O,F) (R = La - Nd, Sm, Gd) high temperature superconductors.