Impact of Disorder on the Superconducting Phase Diagram in BaFe$_2$(As$_{1-x}$P$_x$)$_2$
| Autor: | Takasada Shibauchi, Shigeru Kasahara, Tatsuya Watashige, Yuta Mizukami, Marcin Konczykowski, Kohei Matsuura, Yuji Matsuda |
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| Rok vydání: | 2017 |
| Předmět: |
Superconductivity
Materials science Condensed matter physics Condensed Matter - Superconductivity General Physics and Astronomy FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Superconductivity (cond-mat.supr-con) Dome (geology) Phase (matter) Condensed Matter::Superconductivity 0103 physical sciences Electron beam processing Antiferromagnetism Superconducting transition temperature 010306 general physics 0210 nano-technology Phase diagram |
| DOI: | 10.48550/arxiv.1707.08670 |
| Popis: | 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 BaFe$_2$(As$_{1-x}$P$_x$)$_2$ 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 $T_c$ is depressed at high concentrations ($x\gtrsim$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-$T_c$ family. Comment: 5 pages, 4 figures |
| Databáze: | OpenAIRE |
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