| Full text | |
| Author(s): Show less - |
Piva, M. M.
[1, 2]
;
Besser, M.
[2]
;
Mydeen, K.
[2]
;
Garitezi, T. M.
[1]
;
Rosa, P. F. S.
[1, 3]
;
Adriano, C.
[1]
;
Grant, T.
[3]
;
Fisk, Z.
[3]
;
Urbano, R. R.
[1]
;
Nicklas, M.
[2]
;
Pagliuso, P. G.
[1]
Total Authors: 11
|
| Affiliation: | [1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil
[2] Max Planck Inst Chem Phys Solids, D-01187 Dresden - Germany
[3] Univ Calif Irvine, Irvine, CA 92697 - USA
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | JOURNAL OF PHYSICS-CONDENSED MATTER; v. 27, n. 14 APR 15 2015. |
| Web of Science Citations: | 1 |
| Abstract | |
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. (AU) | |
| FAPESP's process: | 09/09247-3 - Investigation of pressure induced ordered states in novel complex materials. |
| Grantee: | Cris Adriano |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 13/20181-0 - Evolution of topological Kondo insulating behavior in Sm1xRxB6 (r = Sr, Yb) |
| Grantee: | Priscila Ferrari Silveira Rosa |
| Support Opportunities: | Scholarships abroad - Research Internship - Post-doctor |
| FAPESP's process: | 12/04870-7 - Studies of novel complex and advanced materials |
| Grantee: | Pascoal Jose Giglio Pagliuso |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 13/10833-0 - Synthesis and caracterization of single crystaline PrCuBi2 intermetallic compound |
| Grantee: | Mário Moda Piva |
| Support Opportunities: | Scholarships in Brazil - Scientific Initiation |
| FAPESP's process: | 12/05903-6 - Nuclear magnetic resonance of novel complex and advanced materials in condensed matter physics |
| Grantee: | Ricardo Rodrigues Urbano |
| Support Opportunities: | Research Grants - Young Investigators Grants |
| FAPESP's process: | 09/10264-0 - Study of intermetalic compounds for thermoelectrical applications by x-ray diffraction |
| Grantee: | José Renato Linares Mardegan |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 11/19924-2 - Study and development of advanced novel materials: electronic, magnetic and nanostructured: an interdisciplinary approach |
| Grantee: | Carlos Rettori |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 11/01564-0 - Materials sciences on complex and advanced systems |
| Grantee: | Pascoal Jose Giglio Pagliuso |
| Support Opportunities: | Scholarships abroad - Research |
| FAPESP's process: | 11/23650-5 - Investigation of band structure and Fermi surface in advanced complex materials studied by angle-resolved photoemission spectroscopy |
| Grantee: | Cris Adriano |
| Support Opportunities: | Scholarships abroad - Research Internship - Post-doctor |