Behavior of vortices near twin boundaries in underdoped Ba(Fe 1-xCox)2As2

B. Kalisky; J. R. Kirtley; J. G. Analytis; J. H. Chu; I. R. Fisher; K. A. Moler

doi:10.1103/PhysRevB.83.064511

Behavior of vortices near twin boundaries in underdoped Ba(Fe _1-xCo_x)₂As₂

B. Kalisky, J. R. Kirtley, J. G. Analytis, J. H. Chu, I. R. Fisher, K. A. Moler

Research output: Contribution to journal › Article › peer-review

Abstract

We use scanning superconducting quantum interference device (SQUID) microscopy to investigate the behavior of vortices in the presence of twin boundaries in the pnictide superconductor Ba(Fe_1-xCo _x)₂As₂. We show that the vortices avoid pinning on twin boundaries. Individual vortices move in a preferential way when manipulated with the SQUID: They tend to not cross a twin boundary, but rather to move parallel to it. This behavior can be explained by the observation of enhanced superfluid density on twin boundaries in Ba(Fe_1-xCo _x)₂As₂. The observed repulsion from twin boundaries may be a mechanism for enhanced critical currents observed in twinned samples in pnictides and other superconductors.

Original language	English
Article number	064511
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	83
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.83.064511
State	Published - 11 Feb 2011
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Behavior of vortices near twin boundaries in underdoped Ba(Fe 1-xCox)2As2",

abstract = "We use scanning superconducting quantum interference device (SQUID) microscopy to investigate the behavior of vortices in the presence of twin boundaries in the pnictide superconductor Ba(Fe1-xCo x)2As2. We show that the vortices avoid pinning on twin boundaries. Individual vortices move in a preferential way when manipulated with the SQUID: They tend to not cross a twin boundary, but rather to move parallel to it. This behavior can be explained by the observation of enhanced superfluid density on twin boundaries in Ba(Fe1-xCo x)2As2. The observed repulsion from twin boundaries may be a mechanism for enhanced critical currents observed in twinned samples in pnictides and other superconductors.",

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AU - Kalisky, B.

AU - Kirtley, J. R.

AU - Analytis, J. G.

AU - Chu, J. H.

AU - Fisher, I. R.

AU - Moler, K. A.

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N2 - We use scanning superconducting quantum interference device (SQUID) microscopy to investigate the behavior of vortices in the presence of twin boundaries in the pnictide superconductor Ba(Fe1-xCo x)2As2. We show that the vortices avoid pinning on twin boundaries. Individual vortices move in a preferential way when manipulated with the SQUID: They tend to not cross a twin boundary, but rather to move parallel to it. This behavior can be explained by the observation of enhanced superfluid density on twin boundaries in Ba(Fe1-xCo x)2As2. The observed repulsion from twin boundaries may be a mechanism for enhanced critical currents observed in twinned samples in pnictides and other superconductors.

AB - We use scanning superconducting quantum interference device (SQUID) microscopy to investigate the behavior of vortices in the presence of twin boundaries in the pnictide superconductor Ba(Fe1-xCo x)2As2. We show that the vortices avoid pinning on twin boundaries. Individual vortices move in a preferential way when manipulated with the SQUID: They tend to not cross a twin boundary, but rather to move parallel to it. This behavior can be explained by the observation of enhanced superfluid density on twin boundaries in Ba(Fe1-xCo x)2As2. The observed repulsion from twin boundaries may be a mechanism for enhanced critical currents observed in twinned samples in pnictides and other superconductors.

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M3 - مقالة

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JO - Physical Review B - Condensed Matter and Materials Physics

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Behavior of vortices near twin boundaries in underdoped Ba(Fe _1-xCo_x)₂As₂

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