Revisiting the phase diagram of LaFe1−xCoxAsO in single crystals by thermodynamic methods
| Autor: | Liran Wang, Christoph Wuttke, Saicharan Aswartham, Christian Hess, Federico Caglieris, Ruediger Klingeler, Rhea Kappenberger, Sabine Wurmehl, Hans-Joachim Grafe, Xiaochen Hong, Francesco Scaravaggi, Piotr Lepucki, A. P. Dioguardi, Anja U. B. Wolter, S. Sauerland, Bernd Büchner |
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| Rok vydání: | 2021 |
| Předmět: |
Superconductivity
Materials science Condensed matter physics Doping 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Magnetic susceptibility Condensed Matter::Superconductivity Phase (matter) 0103 physical sciences Content (measure theory) Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Orthorhombic crystal system 010306 general physics 0210 nano-technology Phase diagram |
| Zdroj: | Physical Review B. 103 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.103.174506 |
| Popis: | In this work we revisit the phase diagram of Co-doped LaFeAsO using single crystals and thermodynamic methods. From magnetic susceptibility studies, we track the doping evolution of the antiferromagnetic phase to reveal a continuous suppression of ${T}_{\mathrm{N}}$ up to 5% Co doping. To study the evolution of the so-called nematic phase, the temperature dependence of the length changes along the $a$ and $b$ orthorhombic directions, $\mathrm{\ensuremath{\Delta}}L/{L}_{0}$, was determined by high-resolution capacitance dilatometry. The results clearly show a gradual reduction of the orthorhombic distortion $\ensuremath{\delta}$ and of ${T}_{\mathrm{S}}$ with increasing Co content up to 4.5%, while it is completely suppressed for 7.5% Co. Bulk superconductivity was found in a small doping region around 6% Co content, while both ${T}_{\mathrm{c}}$ and the superconducting volume fraction rapidly drop in the neighboring doping regime. Ultimately, no microscopic coexistence between the superconducting and magnetic phases can be assessed within our resolution limit, in sharp contrast with other iron-pnictide families, e.g., electron- and hole-doped ${\mathrm{BaFe}}_{2}{\mathrm{As}}_{2}$. |
| Databáze: | OpenAIRE |
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