Macroscopic phase separation of superconductivity and ferromagnetism in Sr0.5Ce0.5FBiS2−x Se x revealed by μSR
| Autor: | Vadim Grinenko, J. C. Orain, M. V. Salis, Jans Henke, A. M. Nikitin, Hans-Henning Klauss, Anthony A. Amato, Rajib Sarkar, Y. K. Huang, A. de Visser |
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| Přispěvatelé: | Hard Condensed Matter (WZI, IoP, FNWI), Quantum Condensed Matter Theory (ITFA, IoP, FNWI), IoP (FNWI) |
| Rok vydání: | 2017 |
| Předmět: |
Superconductivity
Multidisciplinary Muon Materials science Condensed matter physics lcsh:R lcsh:Medicine 02 engineering and technology Muon spin spectroscopy 021001 nanoscience & nanotechnology 01 natural sciences Article Ferromagnetism Condensed Matter::Superconductivity Phase (matter) Lattice (order) 0103 physical sciences Volume fraction Curie temperature lcsh:Q Condensed Matter::Strongly Correlated Electrons lcsh:Science 010306 general physics 0210 nano-technology |
| Zdroj: | Scientific Reports, 7(1):17370. Nature Publishing Group Scientific Reports, Vol 7, Iss 1, Pp 1-7 (2017) Scientific Reports |
| ISSN: | 2045-2322 |
| DOI: | 10.1038/s41598-017-17637-y |
| Popis: | The compound Sr0.5Ce0.5FBiS2 belongs to the intensively studied family of layered BiS2 superconductors. It attracts special attention because superconductivity at T sc = 2.8 K was found to coexist with local-moment ferromagnetic order with a Curie temperature T C = 7.5 K. Recently it was reported that upon replacing S by Se T C drops and ferromagnetism becomes of an itinerant nature. At the same time T sc increases and it was argued superconductivity coexists with itinerant ferromagnetism. Here we report a muon spin rotation and relaxation study (μSR) conducted to investigate the coexistence of superconductivity and ferromagnetic order in Sr0.5Ce0.5FBiS2−x Se x with x = 0.5 and 1.0. By inspecting the muon asymmetry function we find that both phases do not coexist on the microscopic scale, but occupy different sample volumes. For x = 0.5 and x = 1.0 we find a ferromagnetic volume fraction of ~8 % and ~30 % at T = 0.25 K, well below T C = 3.4 K and T C = 3.3 K, respectively. For x = 1.0 (T sc = 2.9 K) the superconducting phase occupies most (~64 %) of the remaining sample volume, as shown by transverse field experiments that probe the Gaussian damping due to the vortex lattice. We conclude ferromagnetism and superconductivity are macroscopically phase separated. |
| Databáze: | OpenAIRE |
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