Publication Date

8-27-2018

Department

Ames Laboratory; Materials Science and Engineering; Physics and Astronomy

Campus Units

Ames Laboratory, Materials Science and Engineering, Physics and Astronomy

OSTI ID+

1471219

Report Number

IS-J 9720

DOI

10.1103/PhysRevB.98.054516

Journal Title

Physical Review B

Volume Number

98

Issue Number

5

First Page

054516

Abstract

We report magnetic force microscopy (MFM) measurements on the iron-based superconductor Ba1−xKxFe2As2. By measuring locally the Meissner repulsion with the magnetic MFM tip, we determine the absolute value of the in-plane magnetic penetration depth (λab) in underdoped, optimally doped, and overdoped samples. The results suggest an abrupt increase of λab as doping is increased from xopt, which is potentially related to the presence of a quantum critical point. The response of superconducting vortices to magnetic forces exerted by the MFM tip for x=0.19 and 0.58 is compatible with previously observed structural symmetries at those doping levels.

DOE Contract Number(s)

1897/14; AC02-07CH11358

Language

en

Department of Energy Subject Categories

36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Publisher

Iowa State University Digital Repository, Ames IA (United States)

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