Dependence of the absolute value of the penetration depth in (Ba1-xKx)Fe2As2 on doping

被引：8

作者：

Almoalem, Avior ^{[1
]}

Yagil, Alon ^{[1
]}

Cho, Kyuil ^{[2
,3
]}

Teknowijoyo, Serafim ^{[2
,3
]}

Tanatar, Makariy A. ^{[2
,3
]}

Prozorov, Ruslan ^{[2
,3
]}

Liu, Yong ^{[2
]}

Lograsso, Thomas A. ^{[2
,4
]}

Auslaender, Ophir M. ^{[1
]}

机构：

[1] Technion Israel Inst Technol, Dept Phys, IL-32000 Haifa, Israel

[2] Ames Lab, Ames, IA 50011 USA

[3] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

[4] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA

来源：

PHYSICAL REVIEW B | 2018年 / 98卷 / 05期

基金：

以色列科学基金会;

关键词：

Barium compounds - Potassium compounds - Magnetic force microscopy - Iron compounds - Iron-based Superconductors;

D O I：

10.1103/PhysRevB.98.054516

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report magnetic force microscopy (MFM) measurements on the iron-based superconductor (Ba1-xKx)Fe2As2. By measuring locally the Meissner repulsion with the magnetic MFM tip, we determine the absolute value of the in-plane magnetic penetration depth (lambda(ab)) in underdoped, optimally doped, and overdoped samples. The results suggest an abrupt increase of lambda(ab) as doping is increased from x(opt), 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.

引用

页数：7

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