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  Combined external pressure and Cu-substitution studies on BaFe2As2 single crystals

Piva, M. M., Besser, M., Mydeen, K., Garitezi, T. M., Rosa, P. F. S., Adriano, C., et al. (2015). Combined external pressure and Cu-substitution studies on BaFe2As2 single crystals. Journal of Physics: Condensed Matter, 27(14): 145701, pp. 1-5. doi:10.1088/0953-8984/27/14/145701.

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Piva, M. M.1, Autor
Besser, M.2, Autor           
Mydeen, K.3, Autor           
Garitezi, T. M.1, Autor
Rosa, P. F. S.1, Autor
Adriano, C.1, Autor
Grant, T.1, Autor
Fisk, Z.1, Autor
Urbano, R. R.1, Autor
Nicklas, M.4, Autor           
Pagliuso, P. G.1, Autor
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
3Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
4Michael Nicklas, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863472              

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 Zusammenfassung: We report a combined study of external pressure and Cu-substitution on BaFe2As2 single crystals grown by the in-flux technique. At ambient pressure, the Cu-substitution is known to suppress the spin density wave (SDW) phase in pure BaFe2As2 (T-SDW approximate to 140 K) and to induce a superconducting (SC) dome with a maximum transition temperature T-c(max) similar or equal to 4.2 K. This T-c(max) is much lower than the T-c similar to 15-28 K achieved in the case of Ru, Ni and Co substitutions. Such a lower T-c is attributed to a Cu2+ magnetic pair-breaking effect. The latter is strongly suppressed by applied pressure, as shown herein, T-c can be significantly enhanced by applying high pressures. In this work, we investigated the pressure effects on Cu2+ magnetic pair-breaking in the BaFe2-xCuxAs2 series. Around the optimal concentration (x(opd) = 0.11), all samples showed a substantial increase of T-c as a function of pressure. Yet for those samples with a slightly higher doping level (over-doped regime), T-c presented a dome-like shape with maximum T-c similar or equal to 8K. Remarkably interesting, the under-doped samples, e.g. x = 0.02 display a maximum pressure induced T-c similar or equal to 30 K which is comparable to the maximum T-c's found for the pure compound under external pressures. Furthermore, the magnetoresistance effect as a function of pressure in the normal state of the x = 0.02 sample also presented an evolution consistent with the screening of the Cu2+ local moments. These findings demonstrate that the Cu2+ magnetic pair-breaking effect is completely suppressed by applying pressure in the low concentration regime of Cu2+ substituted BaFe2As2.

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Sprache(n): eng - English
 Datum: 2015-03-19
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: ISI: 000351738400009
DOI: 10.1088/0953-8984/27/14/145701
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Titel: Journal of Physics: Condensed Matter
  Kurztitel : J. Phys.: Condens. Matter
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Bristol, UK : IOP Publishing
Seiten: - Band / Heft: 27 (14) Artikelnummer: 145701 Start- / Endseite: 1 - 5 Identifikator: ISSN: 0953-8984
CoNE: https://pure.mpg.de/cone/journals/resource/954928562478