Pressure-induced Fermi-surface reconstruction in the iron-arsenide superconductor Ba1−xKxFe2As2: Evidence of a phase transition inside the antiferromagnetic phase
| Autor: | G. Gredat, S. René de Cotret, Louis Taillefer, Ruslan Prozorov, Bing Shen, Nicolas Doiron-Leyraud, A. Juneau-Fecteau, Hai-Hu Wen, F. Valade, Elena Hassinger, J.-Ph. Reid, H. Kim, Makariy Tanatar |
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| Rok vydání: | 2012 |
| Předmět: |
Physics
Superconductivity Phase transition Condensed matter physics Fermi surface 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Arsenide chemistry.chemical_compound chemistry Electrical resistivity and conductivity Phase (matter) 0103 physical sciences Antiferromagnetism Anomaly (physics) 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review B. 86 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.86.140502 |
| Popis: | The electrical resistivity $\ensuremath{\rho}$ of the iron-arsenide superconductor Ba${}_{1\ensuremath{-}x}$K${}_{x}$Fe${}_{2}$As${}_{2}$ was measured in applied pressures up to 2.6 GPa for four underdoped samples, with $x\ensuremath{\simeq}0.16$, 0.18, 0.19, and 0.21. The antiferromagnetic ordering temperature ${T}_{\mathrm{N}}$, detected as a sharp anomaly in $\ensuremath{\rho}(T)$, decreases linearly with pressure. At pressures above $P\ensuremath{\simeq}1.0$ GPa, a second sharp anomaly is detected at a lower temperature ${T}_{0}$, which rises with pressure. We attribute this second anomaly to the onset of a phase that causes a reconstruction of the Fermi surface. The new phase expands with increasing $x$ and it competes with superconductivity. We discuss the possibility that a second spin-density wave orders at ${T}_{0}$, with a $\mathbf{Q}$ vector distinct from that of the spin-density wave that sets in at ${T}_{\mathrm{N}}$. |
| Databáze: | OpenAIRE |
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