Interrelationships between nematicity, antiferromagnetic spin fluctuations, and superconductivity: Role of hotspots in 
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 revealed by high pressure 
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Rana, Khusboo; Ambika, Devi V.; Bud’ko, Sergey L.; Böhmer, Anna E.; Canfield, Paul C.; Furukawa, Yuji

doi:10.1103/physrevb.107.134507

Cited by 2 publications

(1 citation statement)

References 64 publications

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“…Previous NMR measurements were performed mainly above T c for pure bulk FeSe [10][11][12][13][14][15][16][17][18] and S-substituted FeSe [19][20][21][22][23][24] . Studies have primarily focused on the relationship between superconductivity, nematicity, and magnetic order above T c .…”

Section: Resultsmentioning

confidence: 99%

Spin fluctuations from Bogoliubov Fermi surfaces in the superconducting state of S-substituted FeSe

Yu,

Nakamura,

Inomata

et al. 2023

Commun Phys

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The study of the iron-based superconductor, FeSe, has resulted in various topics, such as the interplay among superconductivity, nematicity, and magnetism, Bardeen-Cooper-Schrieffer Bose-Einstein-condensation (BCS-BEC) crossover, and Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superconductivity. Recently, topologically protected nodal Fermi surfaces, referred to as Bogoliubov Fermi surfaces (BFSs), have garnered much attention. A theoretical model for the S-substituted FeSe system demonstrated that BFSs can manifest under the conditions of spin-orbit coupling, multi-band systems, and superconductivity with time-reversal symmetry breaking. Here we report the observation of spin fluctuations originating from BFSs in the superconducting (SC) state via 77Se-nuclear magnetic resonance measurements to 100 mK. In a heavily S-substituted FeSe, we found an anomalous enhancement of low-energy spin fluctuations deep in the SC state, which cannot be explained by an impurity effect. Such unusual behavior implies the presence of significant spin fluctuations of Bogoliubov quasiparticles, which are associated with possible nesting properties between BFSs.

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Section: Resultsmentioning

confidence: 99%

Spin fluctuations from Bogoliubov Fermi surfaces in the superconducting state of S-substituted FeSe

Yu,

Nakamura,

Inomata

et al. 2023

Commun Phys

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show abstract

Unveiling the quasiparticle behaviour in the pressure-induced high-Tc phase of an iron-chalcogenide superconductor

Zajicek,

Reiss,

Graf

et al. 2024

npj Quantum Mater.

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Superconductivity of iron chalocogenides is strongly enhanced under applied pressure yet its underlying pairing mechanism remains elusive. Here, we present a quantum oscillations study up to 45 T in the high-Tc phase of tetragonal FeSe0.82S0.18 up to 22 kbar. Under applied pressure, the quasi-two-dimensional multi-band Fermi surface expands and the effective masses remain large, whereas the superconductivity displays a threefold enhancement. Comparing with chemical pressure tuning of FeSe1−xSx, the Fermi surface expands in a similar manner but the effective masses and Tc are suppressed. These differences may be attributed to the changes in the density of states influenced by the chalcogen height, which could promote stronger spin fluctuations pairing under pressure. Furthermore, our study also reveals unusual scattering and broadening of superconducting transitions in the high-pressure phase, indicating the presence of a complex pairing mechanism.

show abstract

Interrelationships between nematicity, antiferromagnetic spin fluctuations, and superconductivity: Role of hotspots in FeSe1−xSx revealed by high pressure

Cited by 2 publications

References 64 publications

Spin fluctuations from Bogoliubov Fermi surfaces in the superconducting state of S-substituted FeSe

Spin fluctuations from Bogoliubov Fermi surfaces in the superconducting state of S-substituted FeSe

Unveiling the quasiparticle behaviour in the pressure-induced high-Tc phase of an iron-chalcogenide superconductor

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