Anisotropic superconducting properties of MgB2 single crystals

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

doi:10.1016/S0921-4534(02)01383-7

Anisotropic superconducting properties of MgB₂ single crystals

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

研究成果: Article › 査読

4 被引用数 (Scopus)

抄録

In-plane electrical transport properties of MgB₂ single crystals grown under a high pressure of 4-6 GPa and temperature of 1400-1700 °C in the Mg-B-N system have been measured. For all specimens we found a sharp superconducting transition around 38.1-38.3 K with ΔT_c(10-90%) within 0.2-0.3 K. Estimated resistivity value at 40 K is about 1 μΩ cm and the resistivity ratio ρ(273 K)/ρ(40 K) = 4.9±0.3. Results of measurements in magnetic field up to 5.5 T perpendicular to Mg and B planes (H_⊥) and up to 9 T in parallel orientation (H_∥) show temperature dependent anisotropy of the upper critical field with anisotropy ratio γ = H_c2∥/H_c2⊥ increasing from 2.2 close to T_c up to about 3 below 30 K. Strong deviation of the angular dependence of H_c2 from the anisotropic mass model has been also found.

本文言語	English
ページ（範囲）	61-64
ページ数	4
ジャーナル	Physica C: Superconductivity and its applications
巻	378-381
号	PART 1
DOI	https://doi.org/10.1016/S0921-4534(02)01383-7
出版ステータス	Published - 2002 10月 1
外部発表	はい

ASJC Scopus subject areas

電子材料、光学材料、および磁性材料
凝縮系物理学
エネルギー工学および電力技術
電子工学および電気工学

文献へのアクセス

10.1016/S0921-4534(02)01383-7

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引用スタイル

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title = "Anisotropic superconducting properties of MgB2 single crystals",

abstract = "In-plane electrical transport properties of MgB2 single crystals grown under a high pressure of 4-6 GPa and temperature of 1400-1700 °C in the Mg-B-N system have been measured. For all specimens we found a sharp superconducting transition around 38.1-38.3 K with ΔTc(10-90%) within 0.2-0.3 K. Estimated resistivity value at 40 K is about 1 μΩ cm and the resistivity ratio ρ(273 K)/ρ(40 K) = 4.9±0.3. Results of measurements in magnetic field up to 5.5 T perpendicular to Mg and B planes (H⊥) and up to 9 T in parallel orientation (H∥) show temperature dependent anisotropy of the upper critical field with anisotropy ratio γ = Hc2∥/Hc2⊥ increasing from 2.2 close to Tc up to about 3 below 30 K. Strong deviation of the angular dependence of Hc2 from the anisotropic mass model has been also found.",

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author = "Yu Eltsev and S. Lee and K. Nakao and N. Chikumoto and S. Tajima and N. Koshizuka and M. Murakami",

note = "Funding Information: This work is supported by the New Energy and Industrial Technology Development Organization (NEDO) as Collaborative Research and Development of Fundamental Technologies for Superconductivity Applications. ",

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AU - Eltsev, Yu

AU - Lee, S.

AU - Nakao, K.

AU - Chikumoto, N.

AU - Tajima, S.

AU - Koshizuka, N.

AU - Murakami, M.

N1 - Funding Information: This work is supported by the New Energy and Industrial Technology Development Organization (NEDO) as Collaborative Research and Development of Fundamental Technologies for Superconductivity Applications.

PY - 2002/10/1

Y1 - 2002/10/1

N2 - In-plane electrical transport properties of MgB2 single crystals grown under a high pressure of 4-6 GPa and temperature of 1400-1700 °C in the Mg-B-N system have been measured. For all specimens we found a sharp superconducting transition around 38.1-38.3 K with ΔTc(10-90%) within 0.2-0.3 K. Estimated resistivity value at 40 K is about 1 μΩ cm and the resistivity ratio ρ(273 K)/ρ(40 K) = 4.9±0.3. Results of measurements in magnetic field up to 5.5 T perpendicular to Mg and B planes (H⊥) and up to 9 T in parallel orientation (H∥) show temperature dependent anisotropy of the upper critical field with anisotropy ratio γ = Hc2∥/Hc2⊥ increasing from 2.2 close to Tc up to about 3 below 30 K. Strong deviation of the angular dependence of Hc2 from the anisotropic mass model has been also found.

AB - In-plane electrical transport properties of MgB2 single crystals grown under a high pressure of 4-6 GPa and temperature of 1400-1700 °C in the Mg-B-N system have been measured. For all specimens we found a sharp superconducting transition around 38.1-38.3 K with ΔTc(10-90%) within 0.2-0.3 K. Estimated resistivity value at 40 K is about 1 μΩ cm and the resistivity ratio ρ(273 K)/ρ(40 K) = 4.9±0.3. Results of measurements in magnetic field up to 5.5 T perpendicular to Mg and B planes (H⊥) and up to 9 T in parallel orientation (H∥) show temperature dependent anisotropy of the upper critical field with anisotropy ratio γ = Hc2∥/Hc2⊥ increasing from 2.2 close to Tc up to about 3 below 30 K. Strong deviation of the angular dependence of Hc2 from the anisotropic mass model has been also found.

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