Nodal-to-nodeless superconducting order parameter in LaFeAs$_{1-x}$P$_x$O synthesized under high pressure

T. Shiroka; N. Barbero; R. Khasanov; N. D. Zhigadlo; H. -R. Ott; J. Mesot

doi:10.1038/s41535-018-0099-y

paper

Nodal-to-nodeless superconducting order parameter in LaFeAs $_{1 - x}$ P $_{x}$ O synthesized under high pressure

arXiv:1803.05733 · doi:10.1038/s41535-018-0099-y

Abstract

Similar to chemical doping, pressure produces and stabilizes new phases of known materials, whose properties may differ greatly from those of their standard counterparts. Here, by considering a series of LaFeAs $_{1 - x}$ P $_{x}$ O iron-pnictides synthesized under high-pressure high-temperature conditions, we investigate the simultaneous effects of pressure and isoelectronic doping in the 1111 family. Results of numerous macro- and microscopic technique measurements, unambiguously show a radically different phase diagram for the pressure-grown materials, characterized by the lack of magnetic order and the persistence of superconductivity across the whole $0.3 \leq x \leq 0.7$ doping range. This unexpected scenario is accompanied by a branching in the electronic properties across $x = 0.5$ , involving both the normal and superconducting phases. Most notably, the superconducting order parameter evolves from nodal (for $x < 0.5$ ) to nodeless (for $x \geq 0.5$ ), in clear contrast to other 1111 and 122 iron-based materials grown under ambient-pressure conditions.

arXiv comment9 pages, 7 figures, Suppl. material

Nodal-to-nodeless superconducting order parameter in LaFeAs $_{1 - x}$ P $_{x}$ O synthesized under high pressure

Abstract

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Nodal-to-nodeless superconducting order parameter in LaFeAs1−x​Px​O synthesized under high pressure

Abstract

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Nodal-to-nodeless superconducting order parameter in LaFeAs $_{1 - x}$ P $_{x}$ O synthesized under high pressure