Magnetization and 11B NMR study of Mg1-xAlxB2 superconductors

M. Pissas; G. Papavassiliou; M. Karayanni; M. Fardis; I. Maurin; I. Margiolaki; Kosmas Prassides; C. Christides

Magnetization and ¹¹B NMR study of Mg_1-xAl_xB₂ superconductors

M. Pissas, G. Papavassiliou, M. Karayanni, M. Fardis, I. Maurin, I. Margiolaki, Kosmas Prassides, C. Christides

研究成果: Article › 査読

抄録

We demonstrate the magnetic-field distribution of the pure vortex state in lightly doped Mg_1-xAl_xB₂ (x ≤0.025) powder samples, by using ¹¹B nuclear magnetic resonance in magnetic fields of 23.5 and 47 kOe. The magnetic-field distribution at T=5 K is Al-doping dependent, revealing a considerable decrease of anisotropy in respect to pure MgB₂. This result correlates nicely with magnetization measurements and is consistent with σ-band hole driven superconductivity for MgB₂.

本文言語	English
論文番号	184514
ページ（範囲）	1845141-1845145
ページ数	5
ジャーナル	Physical Review B - Condensed Matter and Materials Physics
巻	65
号	18
出版ステータス	Published - 2002 5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

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AU - Pissas, M.

AU - Papavassiliou, G.

AU - Karayanni, M.

AU - Fardis, M.

AU - Maurin, I.

AU - Margiolaki, I.

AU - Prassides, Kosmas

AU - Christides, C.

PY - 2002/5/1

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N2 - We demonstrate the magnetic-field distribution of the pure vortex state in lightly doped Mg1-xAlxB2 (x ≤0.025) powder samples, by using 11B nuclear magnetic resonance in magnetic fields of 23.5 and 47 kOe. The magnetic-field distribution at T=5 K is Al-doping dependent, revealing a considerable decrease of anisotropy in respect to pure MgB2. This result correlates nicely with magnetization measurements and is consistent with σ-band hole driven superconductivity for MgB2.

AB - We demonstrate the magnetic-field distribution of the pure vortex state in lightly doped Mg1-xAlxB2 (x ≤0.025) powder samples, by using 11B nuclear magnetic resonance in magnetic fields of 23.5 and 47 kOe. The magnetic-field distribution at T=5 K is Al-doping dependent, revealing a considerable decrease of anisotropy in respect to pure MgB2. This result correlates nicely with magnetization measurements and is consistent with σ-band hole driven superconductivity for MgB2.

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Magnetization and 11B NMR study of Mg1-xAlxB2 superconductors

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ASJC Scopus subject areas

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Magnetization and ¹¹B NMR study of Mg_1-xAl_xB₂ superconductors