TY - JOUR
T1 - Superconducting gaps of nanocrystalline MgB2
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
Y1 - 2007/9/1
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 - http://www.scopus.com/inward/record.url?scp=34548283685&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=34548283685&partnerID=8YFLogxK
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 -