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

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

21 Citations (Scopus)

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 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.

Original language	English
Pages (from-to)	61-64
Number of pages	4
Journal	Physica C: Superconductivity and its applications
Volume	378-381
Issue number	PART 1
DOIs	https://doi.org/10.1016/S0921-4534(02)01383-7
Publication status	Published - 2002 Oct 1
Externally published	Yes

Keywords

Anisotropy
MgB
Single crystal
Upper critical field

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.1016/S0921-4534(02)01383-7

Cite this

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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.",

keywords = "Anisotropy, MgB, Single crystal, Upper critical field",

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. ",

year = "2002",

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T1 - Anisotropic superconducting properties of MgB2 single crystals

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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