Superconducting gaps of nanocrystalline MgB2

B. Lorenz; O. Perner; J. Eckert; C. W. Chu

doi:10.1016/j.physc.2007.03.253

Superconducting gaps of nanocrystalline MgB₂

B. Lorenz
, O. Perner
, J. Eckert
, C. W. Chu

Executive Vice President

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

1 Citation (Scopus)

Abstract

The superconducting gap structure of nanocrystalline MgB₂ is investigated by heat capacity measurements. It is shown that the larger σ-gap decreases as a consequence of defects and impurities introduced by the specifics of the high-energy ball milling synthesis process. This explains the reduction of the critical temperature. The smaller π-gap slightly increases as compared to bulk MgB₂ indicating an enhanced interband scattering in the nanocrystalline samples.

Original language	English
Pages (from-to)	553-554
Number of pages	2
Journal	Physica C: Superconductivity and its Applications
Volume	460-462 I
Issue number	SPEC. ISS.
DOIs	https://doi.org/10.1016/j.physc.2007.03.253
Publication status	Published - 2007 Sept 1

All Science Journal Classification (ASJC) codes

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

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10.1016/j.physc.2007.03.253

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title = "Superconducting gaps of nanocrystalline MgB2",

abstract = "The superconducting gap structure of nanocrystalline MgB2 is investigated by heat capacity measurements. It is shown that the larger σ-gap decreases as a consequence of defects and impurities introduced by the specifics of the high-energy ball milling synthesis process. This explains the reduction of the critical temperature. The smaller π-gap slightly increases as compared to bulk MgB2 indicating an enhanced interband scattering in the nanocrystalline samples.",

author = "B. Lorenz and O. Perner and J. Eckert and Chu, \{C. W.\}",

note = "Funding Information: This work was supported by the T.L.L. Temple Foundation, the J.J. and R. Moores Endowment, the Air Force Office of Scientific Research in the Strategic Partnership for Research in Nanotechnology, the State of Texas through TCSUH and at LBNL by the DOE.",

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doi = "10.1016/j.physc.2007.03.253",

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AU - Lorenz, B.

AU - Perner, O.

AU - Eckert, J.

AU - Chu, C. W.

N1 - Funding Information: This work was supported by the T.L.L. Temple Foundation, the J.J. and R. Moores Endowment, the Air Force Office of Scientific Research in the Strategic Partnership for Research in Nanotechnology, the State of Texas through TCSUH and at LBNL by the DOE.

PY - 2007/9/1

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N2 - The superconducting gap structure of nanocrystalline MgB2 is investigated by heat capacity measurements. It is shown that the larger σ-gap decreases as a consequence of defects and impurities introduced by the specifics of the high-energy ball milling synthesis process. This explains the reduction of the critical temperature. The smaller π-gap slightly increases as compared to bulk MgB2 indicating an enhanced interband scattering in the nanocrystalline samples.

AB - The superconducting gap structure of nanocrystalline MgB2 is investigated by heat capacity measurements. It is shown that the larger σ-gap decreases as a consequence of defects and impurities introduced by the specifics of the high-energy ball milling synthesis process. This explains the reduction of the critical temperature. The smaller π-gap slightly increases as compared to bulk MgB2 indicating an enhanced interband scattering in the nanocrystalline samples.

UR - https://www.scopus.com/pages/publications/34548283685

UR - https://www.scopus.com/pages/publications/34548283685#tab=citedBy

U2 - 10.1016/j.physc.2007.03.253

DO - 10.1016/j.physc.2007.03.253

M3 - Article

AN - SCOPUS:34548283685

SN - 0921-4534

VL - 460-462 I

SP - 553

EP - 554

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - SPEC. ISS.

ER -

Superconducting gaps of nanocrystalline MgB₂

Abstract

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