Nematic quantum critical point without magnetism in FeSe 1− x S x superconductors
| Autor: | Kousuke Ishida, Tatsuya Watashige, Shigeru Kasahara, Suguru Hosoi, Yuta Mizukami, Takasada Shibauchi, Kohei Matsuura, Hao Wang, Yuji Matsuda |
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| Rok vydání: | 2016 |
| Předmět: |
unconventional superconductivity
iron-based superconductors FOS: Physical sciences 02 engineering and technology 01 natural sciences Superconductivity (cond-mat.supr-con) nematic susceptibility Condensed Matter - Strongly Correlated Electrons Liquid crystal Condensed Matter::Superconductivity Quantum critical point 0103 physical sciences Antiferromagnetism Cuprate 010306 general physics Absolute zero Phase diagram Physics Superconductivity Condensed Matter - Materials Science Multidisciplinary Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics Condensed Matter - Superconductivity Transition temperature Materials Science (cond-mat.mtrl-sci) 021001 nanoscience & nanotechnology Condensed Matter::Soft Condensed Matter Physical Sciences electronic nematicity Condensed Matter::Strongly Correlated Electrons 0210 nano-technology |
| Zdroj: | Proceedings of the National Academy of Sciences. 113:8139-8143 |
| ISSN: | 1091-6490 0027-8424 |
| DOI: | 10.1073/pnas.1605806113 |
| Popis: | The importance of antiferromagnetic fluctuations are widely acknowledged in most unconventional superconductors. In addition, cuprates and iron pnictides often exhibit unidirectional (nematic) electronic correlations, including stripe and orbital orders, whose fluctuations may also play a key role for electron pairing. However, these nematic correlations are intertwined with antiferromagnetic or charge orders, preventing us to identify the essential role of nematic fluctuations. This calls for new materials having only nematicity without competing or coexisting orders. Here we report systematic elastoresistance measurements in FeSe$_{1-x}$S$_{x}$ superconductors, which, unlike other iron-based families, exhibit an electronic nematic order without accompanying antiferromagnetic order. We find that the nematic transition temperature decreases with sulphur content $x$, whereas the nematic fluctuations are strongly enhanced. Near $x\approx0.17$, the nematic susceptibility diverges towards absolute zero, revealing a nematic quantum critical point. This highlights FeSe$_{1-x}$S$_{x}$ as a unique nonmagnetic system suitable for studying the impact of nematicity on superconductivity. 13 pages, 4 figures. Some discussions are added |
| Databáze: | OpenAIRE |
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