Anisotropic superconducting properties of MgB2 single crystals probed by in-plane electrical transport measurements

Yu Eltsev; S. Lee; K. Nakao; N. Chikumoto; S. Tajima; N. Koshizuka; M. Murakami

Anisotropic superconducting properties of MgB₂ single crystals probed by in-plane electrical transport measurements

Yu Eltsev, S. Lee, K. Nakao, N. Chikumoto, S. Tajima, N. Koshizuka, M. Murakami

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

Abstract

We report on the study of the electronic anisotropy of the MgB2 superconductor using the in-plane resistivity measurements in the magnetic field applied perpendicular and parallel to Mg and B planes of MgB₂ single crystals. The results show the temperature dependent anisotropy of the upper critical field with the anisotropy ratio γ = H_c2∥/H_c2⊥ increasing from 2.2 close to T_c up to about 3 below 30 K. Our estimation of the in-plane and out-of-plane coherence length of about ξ_ab(0) = 68 Å and ξ_c(0) = 23 Å and the electronic mean-free path l_ab = 240 ̊, and l_c = 60 ̊, respectively, indicates MgB₂ single crystal approaches the clean limit type-II superconductor.

Original language	English
Article number	140501
Pages (from-to)	1405011-1405014
Number of pages	4
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	65
Issue number	14
Publication status	Published - 2002 Apr 1
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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Anisotropic superconducting properties of MgB₂ single crystals probed by in-plane electrical transport measurements. / Eltsev, Yu; Lee, S.; Nakao, K.; Chikumoto, N.; Tajima, S.; Koshizuka, N.; Murakami, M.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 65, No. 14, 140501, 01.04.2002, p. 1405011-1405014.

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

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abstract = "We report on the study of the electronic anisotropy of the MgB2 superconductor using the in-plane resistivity measurements in the magnetic field applied perpendicular and parallel to Mg and B planes of MgB2 single crystals. The results show the temperature dependent anisotropy of the upper critical field with the anisotropy ratio γ = Hc2∥/Hc2⊥ increasing from 2.2 close to Tc up to about 3 below 30 K. Our estimation of the in-plane and out-of-plane coherence length of about ξab(0) = 68 {\AA} and ξc(0) = 23 {\AA} and the electronic mean-free path lab = 240 ̊, and lc = 60 ̊, respectively, indicates MgB2 single crystal approaches the clean limit type-II superconductor.",

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T1 - Anisotropic superconducting properties of MgB2 single crystals probed by in-plane electrical transport measurements

AU - Eltsev, Yu

AU - Lee, S.

AU - Nakao, K.

AU - Chikumoto, N.

AU - Tajima, S.

AU - Koshizuka, N.

AU - Murakami, M.

PY - 2002/4/1

Y1 - 2002/4/1

N2 - We report on the study of the electronic anisotropy of the MgB2 superconductor using the in-plane resistivity measurements in the magnetic field applied perpendicular and parallel to Mg and B planes of MgB2 single crystals. The results show the temperature dependent anisotropy of the upper critical field with the anisotropy ratio γ = Hc2∥/Hc2⊥ increasing from 2.2 close to Tc up to about 3 below 30 K. Our estimation of the in-plane and out-of-plane coherence length of about ξab(0) = 68 Å and ξc(0) = 23 Å and the electronic mean-free path lab = 240 ̊, and lc = 60 ̊, respectively, indicates MgB2 single crystal approaches the clean limit type-II superconductor.

AB - We report on the study of the electronic anisotropy of the MgB2 superconductor using the in-plane resistivity measurements in the magnetic field applied perpendicular and parallel to Mg and B planes of MgB2 single crystals. The results show the temperature dependent anisotropy of the upper critical field with the anisotropy ratio γ = Hc2∥/Hc2⊥ increasing from 2.2 close to Tc up to about 3 below 30 K. Our estimation of the in-plane and out-of-plane coherence length of about ξab(0) = 68 Å and ξc(0) = 23 Å and the electronic mean-free path lab = 240 ̊, and lc = 60 ̊, respectively, indicates MgB2 single crystal approaches the clean limit type-II superconductor.

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