Very high upper critical fields in MgB2 produced by selective tuning of impurity scattering. Gurevich, A, Patnaik, S, Braccini, V, Kim, K., Mielke, C, Song, X, Cooley, L., Bu, S., Kim, D., Choi, J., Belenky, L., Giencke, J, Lee, M., Tian, W, Pan, X., Siri, A, Hellstrom, E., Eom, C., & Larbalestier, D. SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 17(2, S):278-286, FEB, 2004. doi abstract bibtex We report a significant enhancement of the upper critical field H-c2 of different MgB2 samples alloyed with nonmagnetic impurities. By studying films and bulk polycrystals with different resistivities rho, we show a clear trend of an increase in H-c2 as rho increases. One particular high resistivity film had a zero-temperature H-c2(0) well above the H-c2 values of competing non-cuprate superconductors such as Nb3Sn and Nb-Ti. Our high-field transport measurements give record values H-c2(perpendicular to) (0) approximate to34 T and H-c2(parallel to) (0) approximate to49 T for high resistivity films and H-c2(0) approximate to 29 T for untextured bulk polycrystals. The highest H-c2 film also exhibits a significant upward curvature of H-c2 (T) and a temperature dependence of the anisotropy parameter gamma (T) = H-c2(parallel to)/H-c2(perpendicular to) opposite to that of single crystals: gamma (T) decreases as the temperature decreases, from gamma (T-c) approximate to 2 to gamma (0) approximate to 1.5. This remarkable H-c2 enhancement and its anomalous temperature dependence are a consequence of the two-gap superconductivity in MgB2, which offers special opportunities for further H-c2 increases by tuning of the impurity scattering by selective alloying on Mg and B sites. Our experimental results can be explained by a theory of two-gap superconductivity in the dirty limit. The very high values of H-c2(T) observed suggest that MgB2 can be made into a versatile, competitive high-field superconductor.
@article{ ISI:000189103100028,
Author = {Gurevich, A and Patnaik, S and Braccini, V and Kim, KH and Mielke, C and
Song, X and Cooley, LD and Bu, SD and Kim, DM and Choi, JH and Belenky,
LJ and Giencke, J and Lee, MK and Tian, W and Pan, XQ and Siri, A and
Hellstrom, EE and Eom, CB and Larbalestier, DC},
Title = {{Very high upper critical fields in MgB2 produced by selective tuning of
impurity scattering}},
Journal = {{SUPERCONDUCTOR SCIENCE \& TECHNOLOGY}},
Year = {{2004}},
Volume = {{17}},
Number = {{2, S}},
Pages = {{278-286}},
Month = {{FEB}},
Abstract = {{We report a significant enhancement of the upper critical field H-c2 of
different MgB2 samples alloyed with nonmagnetic impurities. By studying
films and bulk polycrystals with different resistivities rho, we show a
clear trend of an increase in H-c2 as rho increases. One particular high
resistivity film had a zero-temperature H-c2(0) well above the H-c2
values of competing non-cuprate superconductors such as Nb3Sn and Nb-Ti.
Our high-field transport measurements give record values
H-c2(perpendicular to) (0) approximate to34 T and H-c2(parallel to) (0)
approximate to49 T for high resistivity films and H-c2(0) approximate to
29 T for untextured bulk polycrystals. The highest H-c2 film also
exhibits a significant upward curvature of H-c2 (T) and a temperature
dependence of the anisotropy parameter gamma (T) = H-c2(parallel
to)/H-c2(perpendicular to) opposite to that of single crystals: gamma
(T) decreases as the temperature decreases, from gamma (T-c) approximate
to 2 to gamma (0) approximate to 1.5. This remarkable H-c2 enhancement
and its anomalous temperature dependence are a consequence of the
two-gap superconductivity in MgB2, which offers special opportunities
for further H-c2 increases by tuning of the impurity scattering by
selective alloying on Mg and B sites. Our experimental results can be
explained by a theory of two-gap superconductivity in the dirty limit.
The very high values of H-c2(T) observed suggest that MgB2 can be made
into a versatile, competitive high-field superconductor.}},
DOI = {{10.1088/0953-2048/17/2/008}},
Article-Number = {{PII S0953-2048(04)68338-2}},
ISSN = {{0953-2048}},
ResearcherID-Numbers = {{Cooley, Lance/E-7377-2015
Gurevich, Alex/A-4327-2008
Bu, Sang Don/B-1576-2008
Eom, Chang-Beom/I-5567-2014
Larbalestier, David/B-2277-2008}},
ORCID-Numbers = {{Cooley, Lance/0000-0003-3488-2980
Gurevich, Alex/0000-0003-0759-8941
Bu, Sang Don/0000-0003-4883-1308
Larbalestier, David/0000-0001-7098-7208}},
Unique-ID = {{ISI:000189103100028}},
}
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By studying films and bulk polycrystals with different resistivities rho, we show a clear trend of an increase in H-c2 as rho increases. One particular high resistivity film had a zero-temperature H-c2(0) well above the H-c2 values of competing non-cuprate superconductors such as Nb3Sn and Nb-Ti. Our high-field transport measurements give record values H-c2(perpendicular to) (0) approximate to34 T and H-c2(parallel to) (0) approximate to49 T for high resistivity films and H-c2(0) approximate to 29 T for untextured bulk polycrystals. The highest H-c2 film also exhibits a significant upward curvature of H-c2 (T) and a temperature dependence of the anisotropy parameter gamma (T) = H-c2(parallel to)/H-c2(perpendicular to) opposite to that of single crystals: gamma (T) decreases as the temperature decreases, from gamma (T-c) approximate to 2 to gamma (0) approximate to 1.5. This remarkable H-c2 enhancement and its anomalous temperature dependence are a consequence of the two-gap superconductivity in MgB2, which offers special opportunities for further H-c2 increases by tuning of the impurity scattering by selective alloying on Mg and B sites. Our experimental results can be explained by a theory of two-gap superconductivity in the dirty limit. The very high values of H-c2(T) observed suggest that MgB2 can be made into a versatile, competitive high-field superconductor.","doi":"10.1088/0953-2048/17/2/008","article-number":"PII S0953-2048(04)68338-2","issn":"0953-2048","researcherid-numbers":"Cooley, Lance/E-7377-2015 Gurevich, Alex/A-4327-2008 Bu, Sang Don/B-1576-2008 Eom, Chang-Beom/I-5567-2014 Larbalestier, David/B-2277-2008","orcid-numbers":"Cooley, Lance/0000-0003-3488-2980 Gurevich, Alex/0000-0003-0759-8941 Bu, Sang Don/0000-0003-4883-1308 Larbalestier, David/0000-0001-7098-7208","unique-id":"ISI:000189103100028","bibtex":"@article{ ISI:000189103100028,\nAuthor = {Gurevich, A and Patnaik, S and Braccini, V and Kim, KH and Mielke, C and\n Song, X and Cooley, LD and Bu, SD and Kim, DM and Choi, JH and Belenky,\n LJ and Giencke, J and Lee, MK and Tian, W and Pan, XQ and Siri, A and\n Hellstrom, EE and Eom, CB and Larbalestier, DC},\nTitle = {{Very high upper critical fields in MgB2 produced by selective tuning of\n impurity scattering}},\nJournal = {{SUPERCONDUCTOR SCIENCE \\& TECHNOLOGY}},\nYear = {{2004}},\nVolume = {{17}},\nNumber = {{2, S}},\nPages = {{278-286}},\nMonth = {{FEB}},\nAbstract = {{We report a significant enhancement of the upper critical field H-c2 of\n different MgB2 samples alloyed with nonmagnetic impurities. By studying\n films and bulk polycrystals with different resistivities rho, we show a\n clear trend of an increase in H-c2 as rho increases. One particular high\n resistivity film had a zero-temperature H-c2(0) well above the H-c2\n values of competing non-cuprate superconductors such as Nb3Sn and Nb-Ti.\n Our high-field transport measurements give record values\n H-c2(perpendicular to) (0) approximate to34 T and H-c2(parallel to) (0)\n approximate to49 T for high resistivity films and H-c2(0) approximate to\n 29 T for untextured bulk polycrystals. The highest H-c2 film also\n exhibits a significant upward curvature of H-c2 (T) and a temperature\n dependence of the anisotropy parameter gamma (T) = H-c2(parallel\n to)/H-c2(perpendicular to) opposite to that of single crystals: gamma\n (T) decreases as the temperature decreases, from gamma (T-c) approximate\n to 2 to gamma (0) approximate to 1.5. 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