Effects of magnetic and non-magnetic doping on the vortex lattice in MgB2

Elizabeth R. Louden; Soham Manni; Judah E.Van Zandt; Allan W.D. Leishman; Valentin Taufour; Sergey L. Bud'Ko; Lisa Debeer-Schmitt; Dirk Honecker; Charles D. Dewhurst; Paul C. Canfield; Morten R. Eskildsen

doi:10.1107/S160057672200468X

Effects of magnetic and non-magnetic doping on the vortex lattice in MgB₂

Elizabeth R. Louden, Soham Manni, Judah E.Van Zandt, Allan W.D. Leishman, Valentin Taufour, Sergey L. Bud'Ko, Lisa Debeer-Schmitt, Dirk Honecker, Charles D. Dewhurst, Paul C. Canfield, Morten R. Eskildsen

SANS & Spin Echo

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

2 Scopus citations

Abstract

Small-angle neutron scattering has been used to study the vortex lattice in superconducting MgB2 doped with either manganese or carbon to achieve a similar suppression of the critical temperature. Measurements were performed with the magnetic field applied along the c axis, where the vortex lattice in pure MgB2 is known to undergo a field- and temperature-driven 30° rotation transition. For Mn doping, the vortex lattice phase diagram remains qualitatively similar to that of pure MgB2, indicating only a modest effect on the vortex-vortex interaction. In contrast, the vortex lattice rotation transition is completely suppressed in the C-doped case, probably due to a change in the electronic structure which affects the two-band/two-gap nature of superconductivity in MgB2. The vortex lattice longitudinal correlation length shows the opposite behavior, remaining roughly unchanged between pure and C-doped MgB2 while it is significantly reduced in the Mn-doped case. However, the extensive vortex lattice metastability and related activated behavior, observed in conjunction with the vortex lattice transition in pure MgB2, are also seen in the Mn-doped sample. This shows that the vortex lattice disordering is not associated with a substantially increased vortex pinning.

Original language	English
Pages (from-to)	693-701
Number of pages	9
Journal	Journal of Applied Crystallography
Volume	55
DOIs	https://doi.org/10.1107/S160057672200468X
State	Published - Aug 1 2022

Funding

We thank J. Barker for help with the SANS experiments as NCNR and T. Williams for assistance collecting the X-ray Laue data. Ames Laboratory is operated for the US Department of Energy by Iowa State University. We acknowledge the support of the National Institute of Standards and Technology, US Department of Commerce, in providing the neutron research facilities used in this work. A portion of this research used resources at the High Flux Isotope Reactor and at the Spallation Neutron Source X-ray laboratory, DOE Office of Science User Facilities operated by the Oak Ridge National Laboratory. Funding for the neutron scattering was provided by the US Department of Energy, Office of Basic Energy Sciences (award No. DE-SC0005051). SM was funded by the Gordon and Betty Moore Foundations EPiQS Initiative (grant No. GBMF4411). The work at Ames was supported by the US Department of Energy, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division (contract No. AC02-07CH11358).

Funders	Funder number
U.S. Department of Energy
National Institute of Standards and Technology
U.S. Department of Commerce
Gordon and Betty Moore Foundation	GBMF4411
Office of Science
Basic Energy Sciences	DE-SC0005051
Division of Materials Sciences and Engineering	AC02-07CH11358

Keywords

MgB
doping
small-angle neutron scattering
structural transition
vortex lattices

Access to Document

10.1107/S160057672200468X

Cite this

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title = "Effects of magnetic and non-magnetic doping on the vortex lattice in MgB2",

abstract = "Small-angle neutron scattering has been used to study the vortex lattice in superconducting MgB2 doped with either manganese or carbon to achieve a similar suppression of the critical temperature. Measurements were performed with the magnetic field applied along the c axis, where the vortex lattice in pure MgB2 is known to undergo a field- and temperature-driven 30° rotation transition. For Mn doping, the vortex lattice phase diagram remains qualitatively similar to that of pure MgB2, indicating only a modest effect on the vortex-vortex interaction. In contrast, the vortex lattice rotation transition is completely suppressed in the C-doped case, probably due to a change in the electronic structure which affects the two-band/two-gap nature of superconductivity in MgB2. The vortex lattice longitudinal correlation length shows the opposite behavior, remaining roughly unchanged between pure and C-doped MgB2 while it is significantly reduced in the Mn-doped case. However, the extensive vortex lattice metastability and related activated behavior, observed in conjunction with the vortex lattice transition in pure MgB2, are also seen in the Mn-doped sample. This shows that the vortex lattice disordering is not associated with a substantially increased vortex pinning.",

keywords = "MgB, doping, small-angle neutron scattering, structural transition, vortex lattices",

author = "Louden, {Elizabeth R.} and Soham Manni and Zandt, {Judah E.Van} and Leishman, {Allan W.D.} and Valentin Taufour and Bud'Ko, {Sergey L.} and Lisa Debeer-Schmitt and Dirk Honecker and Dewhurst, {Charles D.} and Canfield, {Paul C.} and Eskildsen, {Morten R.}",

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AU - Louden, Elizabeth R.

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AU - Zandt, Judah E.Van

AU - Leishman, Allan W.D.

AU - Taufour, Valentin

AU - Bud'Ko, Sergey L.

AU - Debeer-Schmitt, Lisa

AU - Honecker, Dirk

AU - Dewhurst, Charles D.

AU - Canfield, Paul C.

AU - Eskildsen, Morten R.

PY - 2022/8/1

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N2 - Small-angle neutron scattering has been used to study the vortex lattice in superconducting MgB2 doped with either manganese or carbon to achieve a similar suppression of the critical temperature. Measurements were performed with the magnetic field applied along the c axis, where the vortex lattice in pure MgB2 is known to undergo a field- and temperature-driven 30° rotation transition. For Mn doping, the vortex lattice phase diagram remains qualitatively similar to that of pure MgB2, indicating only a modest effect on the vortex-vortex interaction. In contrast, the vortex lattice rotation transition is completely suppressed in the C-doped case, probably due to a change in the electronic structure which affects the two-band/two-gap nature of superconductivity in MgB2. The vortex lattice longitudinal correlation length shows the opposite behavior, remaining roughly unchanged between pure and C-doped MgB2 while it is significantly reduced in the Mn-doped case. However, the extensive vortex lattice metastability and related activated behavior, observed in conjunction with the vortex lattice transition in pure MgB2, are also seen in the Mn-doped sample. This shows that the vortex lattice disordering is not associated with a substantially increased vortex pinning.

AB - Small-angle neutron scattering has been used to study the vortex lattice in superconducting MgB2 doped with either manganese or carbon to achieve a similar suppression of the critical temperature. Measurements were performed with the magnetic field applied along the c axis, where the vortex lattice in pure MgB2 is known to undergo a field- and temperature-driven 30° rotation transition. For Mn doping, the vortex lattice phase diagram remains qualitatively similar to that of pure MgB2, indicating only a modest effect on the vortex-vortex interaction. In contrast, the vortex lattice rotation transition is completely suppressed in the C-doped case, probably due to a change in the electronic structure which affects the two-band/two-gap nature of superconductivity in MgB2. The vortex lattice longitudinal correlation length shows the opposite behavior, remaining roughly unchanged between pure and C-doped MgB2 while it is significantly reduced in the Mn-doped case. However, the extensive vortex lattice metastability and related activated behavior, observed in conjunction with the vortex lattice transition in pure MgB2, are also seen in the Mn-doped sample. This shows that the vortex lattice disordering is not associated with a substantially increased vortex pinning.

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