Impact of Disorder on the Superconducting Phase Diagram in BaFe2(As1-xPx)2
Abstract
In many classes of unconventional superconductors, the question of whether the superconductivity is enhanced by the quantum-critical fluctuations on the verge of an ordered phase remains elusive. One of the most direct ways of addressing this issue is to investigate how the superconducting dome traces a shift of the ordered phase. Here, we study how the phase diagram of the iron-based superconductor BaFe2(As1-xPx)2 changes with disorder via electron irradiation, which keeps the carrier concentrations intact. With increasing disorder, we find that the magneto-structural transition is suppressed, indicating that the critical concentration is shifted to the lower side. Although the superconducting transition temperature Tc is depressed at high concentrations (x ≳ 0.28), it shows an initial increase at lower x. This implies that the superconducting dome tracks the shift of the antiferromagnetic phase, supporting the view of the crucial role played by quantum-critical fluctuations in enhancing superconductivity in this iron-based high-Tc family.
- Publication:
-
Journal of the Physical Society of Japan
- Pub Date:
- August 2017
- DOI:
- 10.7566/JPSJ.86.083706
- arXiv:
- arXiv:1707.08670
- Bibcode:
- 2017JPSJ...86h3706M
- Keywords:
-
- Condensed Matter - Superconductivity
- E-Print:
- 5 pages, 4 figures