Doping evolution of the anisotropic upper critical fields in the iron-based superconductor  Ba1−xKxFe2As2

Tanatar, Makariy; Liu, Yong; Jaroszynski,, J.; Brooks, J.; Lograsso, Thomas; Lograsso, Thomas; Prozorov, Ruslan

Doping evolution of the anisotropic upper critical fields in the iron-based superconductor Ba1−xKxFe2As2

File

IS_J_9508.pdf (674.65 KB)

Date

2017-11-01

Authors

Tanatar, Makariy

Liu, Yong

Jaroszynski,, J.

Brooks, J.

Lograsso, Thomas

Prozorov, Ruslan

Authors

Person

Lograsso, Thomas

Ames Laboratory Division Director

Organizational Units

Organizational Unit

Ames National Laboratory

Organizational Unit

Physics and Astronomy

Physics and astronomy are basic natural sciences which attempt to describe and provide an understanding of both our world and our universe. Physics serves as the underpinning of many different disciplines including the other natural sciences and technological areas.

Organizational Unit

Materials Science and Engineering

Materials engineers create new materials and improve existing materials. Everything is limited by the materials that are used to produce it. Materials engineers understand the relationship between the properties of a material and its internal structure — from the macro level down to the atomic level. The better the materials, the better the end result — it’s as simple as that.

Department

Ames National LaboratoryPhysics and AstronomyMaterials Science and Engineering

Abstract

In-plane resistivity measurements as a function of temperature and magnetic field up to 35 T with precise orientation within the crystallographic ac plane were used to study the upper critical field Hc2 of the hole-doped iron-based superconductor Ba1−xKxFe2As2. Compositions of the samples studied spanned from under- doped x=0.17 (Tc=12 K) and x=0.22 (Tc=20 K), both in the coexistence range of stripe magnetism and superconductivity, through optimal doping x=0.39 (Tc=38.4 K) and x=0.47 (Tc=37.2 K), to overdoped x=0.65 (Tc=22 K) and x=0.83 (Tc=10 K). We find notable doping asymmetry of the shapes of the anisotropic Hc2(T), suggesting the important role of paramagnetic limiting effects in the H∥a configuration in overdoped compositions and multiband effects in underdoped compositions.