Bulk superconductivity and role of fluctuations in the iron-based superconductor FeSe at high pressures

Abstract

The iron-based superconductor FeSe offers a unique possibility to study the interplay of superconductivity with purely nematic as well magnetic-nematic order by pressure (p) tuning. By measuring specific heat under p up to 2.36GPa, we study the multiple phases in FeSe using a thermodynamic probe. We conclude that superconductivity is bulk across the entire p range and competes with magnetism. Our analysis suggests that superconducting and magnetic fluctuations exist over a wide temperature range above the respective bulk transition temperatures, whenever magnetism is present. These observations highlight similarities between FeSe and underdoped cuprate superconductors where fluctuations play a crucial role.

arXiv comment7 pages, 4 figures + Supplementary Information

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Cited by in corpus (15)

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• Exotic Superconducting States in FeSe-based Materials
• Theory of Cross Phenomena and Their Coefficients Beyond Onsager Theorem
• Hydrostatic and uniaxial pressure tuning of iron-based superconductors: Insights into superconductivity, magnetism, nematicity and collapsed tetragonal transitions
• Thermodynamics of transition to BCS-BEC crossover superconductivity in FeSe${}_{1-x}$S${}_x$
• Magnetoresistance scaling, disorder, `hot spots' and the origin of $T$-linear resistivity in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• BCS-BEC Crossover and Pairing Fluctuations in a Two Band Superfluid/Superconductor: A T Matrix Approach
• Interrelationships between nematicity, antiferromagnetic spin fluctuations and superconductivity: Role of hotspots in FeSe${}_{1-x}$S${}_x$ revealed by high pressure ${}^{77}$Se NMR study
• Robust superconductivity and fragile magnetism induced by the strong Cu impurity scattering in the high-pressure phase of FeSe
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• Symmetry-breaking-induced topology in FeSe
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