Growth, structure analysis and anisotropic superconducting properties of MgB2 single crystals

Sergey Lee; Hatsumi Mori; Takahiko Masui; Yuri Eltsev; Ayako Yamamoto; Setsuko Tajima

doi:10.1143/JPSJ.70.2255

Growth, structure analysis and anisotropic superconducting properties of MgB₂ single crystals

Sergey Lee, Hatsumi Mori, Takahiko Masui, Yuri Eltsev, Ayako Yamamoto, Setsuko Tajima

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

224 Citations (Scopus)

Abstract

Here we report the growth of sub-millimeter MgB₂ single crystals of various shapes under high pressure in Mg-B-N system. Structure refinement using a single-crysial X-ray diffraction analysis gives lattice parameters a = 3.0851(5) Å and c = 3.5201(5) Å with small reliability factors R_w = 0.025, R = 0.018), which enables us to analyze the Fourier and Fourier difference maps. The maps clearly show the B sp² orbitals and covalency of the B-B bonds. The sharp superconducting transitions at T_c = 38.1-38.3 K were obtained in both magnetization ΔT_c = 0.6 K) and resistivity (ΔT_c < 0.3 K) measurements. Resistivity measurements with magnetic fields applied parallel and perpendicular to the Mg and B sheets reveal the anisotropic nature of this compound, with upper critical field anisotropy ratio of about 2.7.

Original language	English
Pages (from-to)	2255-2258
Number of pages	4
Journal	journal of the physical society of japan
Volume	70
Issue number	8
DOIs	https://doi.org/10.1143/JPSJ.70.2255
Publication status	Published - 2001 Aug
Externally published	Yes

Keywords

Crystal growth
Crystal structure
Magnesium diboride
Superconducting anisotropy
Superconductivity

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.70.2255

Cite this

@article{3690155226394a32b4ba0bcc3c4c3073,

title = "Growth, structure analysis and anisotropic superconducting properties of MgB2 single crystals",

abstract = "Here we report the growth of sub-millimeter MgB2 single crystals of various shapes under high pressure in Mg-B-N system. Structure refinement using a single-crysial X-ray diffraction analysis gives lattice parameters a = 3.0851(5) {\AA} and c = 3.5201(5) {\AA} with small reliability factors Rw = 0.025, R = 0.018), which enables us to analyze the Fourier and Fourier difference maps. The maps clearly show the B sp2 orbitals and covalency of the B-B bonds. The sharp superconducting transitions at Tc = 38.1-38.3 K were obtained in both magnetization ΔTc = 0.6 K) and resistivity (ΔTc < 0.3 K) measurements. Resistivity measurements with magnetic fields applied parallel and perpendicular to the Mg and B sheets reveal the anisotropic nature of this compound, with upper critical field anisotropy ratio of about 2.7.",

keywords = "Crystal growth, Crystal structure, Magnesium diboride, Superconducting anisotropy, Superconductivity",

author = "Sergey Lee and Hatsumi Mori and Takahiko Masui and Yuri Eltsev and Ayako Yamamoto and Setsuko Tajima",

year = "2001",

month = aug,

doi = "10.1143/JPSJ.70.2255",

language = "English",

volume = "70",

pages = "2255--2258",

journal = "Journal of the Physical Society of Japan",

issn = "0031-9015",

publisher = "Physical Society of Japan",

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TY - JOUR

T1 - Growth, structure analysis and anisotropic superconducting properties of MgB2 single crystals

AU - Lee, Sergey

AU - Mori, Hatsumi

AU - Masui, Takahiko

AU - Eltsev, Yuri

AU - Yamamoto, Ayako

AU - Tajima, Setsuko

PY - 2001/8

Y1 - 2001/8

N2 - Here we report the growth of sub-millimeter MgB2 single crystals of various shapes under high pressure in Mg-B-N system. Structure refinement using a single-crysial X-ray diffraction analysis gives lattice parameters a = 3.0851(5) Å and c = 3.5201(5) Å with small reliability factors Rw = 0.025, R = 0.018), which enables us to analyze the Fourier and Fourier difference maps. The maps clearly show the B sp2 orbitals and covalency of the B-B bonds. The sharp superconducting transitions at Tc = 38.1-38.3 K were obtained in both magnetization ΔTc = 0.6 K) and resistivity (ΔTc < 0.3 K) measurements. Resistivity measurements with magnetic fields applied parallel and perpendicular to the Mg and B sheets reveal the anisotropic nature of this compound, with upper critical field anisotropy ratio of about 2.7.

AB - Here we report the growth of sub-millimeter MgB2 single crystals of various shapes under high pressure in Mg-B-N system. Structure refinement using a single-crysial X-ray diffraction analysis gives lattice parameters a = 3.0851(5) Å and c = 3.5201(5) Å with small reliability factors Rw = 0.025, R = 0.018), which enables us to analyze the Fourier and Fourier difference maps. The maps clearly show the B sp2 orbitals and covalency of the B-B bonds. The sharp superconducting transitions at Tc = 38.1-38.3 K were obtained in both magnetization ΔTc = 0.6 K) and resistivity (ΔTc < 0.3 K) measurements. Resistivity measurements with magnetic fields applied parallel and perpendicular to the Mg and B sheets reveal the anisotropic nature of this compound, with upper critical field anisotropy ratio of about 2.7.

KW - Crystal growth

KW - Crystal structure

KW - Magnesium diboride

KW - Superconducting anisotropy

KW - Superconductivity

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