Microwave performance of high-density bulk MgB2

A. T. Findikoglu; A. Serquis; L. Civale; X. Z. Liao; Y. T. Zhu; M. E. Hawley; F. M. Mueller; V. F. Nesterenko; Y. Gu

doi:10.1063/1.1590739

Microwave performance of high-density bulk MgB₂

A. T. Findikoglu, A. Serquis, L. Civale, X. Z. Liao, Y. T. Zhu, M. E. Hawley, F. M. Mueller, V. F. Nesterenko, Y. Gu

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

8 Citations (Scopus)

Abstract

We have performed microwave measurements on superconducting hot-isostatically pressed (HIPed) bulk MgB₂using a parallel-plate resonator technique. The high density and strength of the HIPed material allowed preparation of samples with mirror-like surfaces for microwave measurements. The microwave effective surface resistance R_s decreased by about 40% at 20 K when the root-mean-square surface roughness was reduced from 220 to 110 nm through surface polishing and ion milling. The R_s was independent of surface microwave magnetic field at least up to 4 Oe and below 30 K. We attribute this behavior, and the overall low R_s (∼0.8 mΩ at 10 GHz and 20 K), to the high density of our samples and the absence of weak links between grains.

Original language	English
Pages (from-to)	108-110
Journal	Applied Physics Letters
Volume	83
Issue number	1
Online published	30 Jun 2003
DOIs	https://doi.org/10.1063/1.1590739
Publication status	Published - 7 Jul 2003
Externally published	Yes

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title = "Microwave performance of high-density bulk MgB2",

abstract = "We have performed microwave measurements on superconducting hot-isostatically pressed (HIPed) bulk MgB2 using a parallel-plate resonator technique. The high density and strength of the HIPed material allowed preparation of samples with mirror-like surfaces for microwave measurements. The microwave effective surface resistance Rs decreased by about 40% at 20 K when the root-mean-square surface roughness was reduced from 220 to 110 nm through surface polishing and ion milling. The Rs was independent of surface microwave magnetic field at least up to 4 Oe and below 30 K. We attribute this behavior, and the overall low Rs (∼0.8 mΩ at 10 GHz and 20 K), to the high density of our samples and the absence of weak links between grains.",

author = "Findikoglu, {A. T.} and A. Serquis and L. Civale and Liao, {X. Z.} and Zhu, {Y. T.} and Hawley, {M. E.} and Mueller, {F. M.} and Nesterenko, {V. F.} and Y. Gu",

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T1 - Microwave performance of high-density bulk MgB2

AU - Findikoglu, A. T.

AU - Serquis, A.

AU - Civale, L.

AU - Liao, X. Z.

AU - Zhu, Y. T.

AU - Hawley, M. E.

AU - Mueller, F. M.

AU - Nesterenko, V. F.

AU - Gu, Y.

PY - 2003/7/7

Y1 - 2003/7/7

N2 - We have performed microwave measurements on superconducting hot-isostatically pressed (HIPed) bulk MgB2 using a parallel-plate resonator technique. The high density and strength of the HIPed material allowed preparation of samples with mirror-like surfaces for microwave measurements. The microwave effective surface resistance Rs decreased by about 40% at 20 K when the root-mean-square surface roughness was reduced from 220 to 110 nm through surface polishing and ion milling. The Rs was independent of surface microwave magnetic field at least up to 4 Oe and below 30 K. We attribute this behavior, and the overall low Rs (∼0.8 mΩ at 10 GHz and 20 K), to the high density of our samples and the absence of weak links between grains.

AB - We have performed microwave measurements on superconducting hot-isostatically pressed (HIPed) bulk MgB2 using a parallel-plate resonator technique. The high density and strength of the HIPed material allowed preparation of samples with mirror-like surfaces for microwave measurements. The microwave effective surface resistance Rs decreased by about 40% at 20 K when the root-mean-square surface roughness was reduced from 220 to 110 nm through surface polishing and ion milling. The Rs was independent of surface microwave magnetic field at least up to 4 Oe and below 30 K. We attribute this behavior, and the overall low Rs (∼0.8 mΩ at 10 GHz and 20 K), to the high density of our samples and the absence of weak links between grains.

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DO - 10.1063/1.1590739

M3 - RGC 21 - Publication in refereed journal

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JO - Applied Physics Letters

JF - Applied Physics Letters

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