Superconductivity of highly spin-polarized electrons in FeSe probed by 
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 NMR

Molatta, S.; Opherden, D.; Wosnitza, J.; Opherden, L.; Zhang, Zhitao; Wolf, Thomas; Löhneysen, H. v.; Sarkar, Rajib; Biswas⃰, Pabitra Kumar; Grafe, H.-J.; Kühne, H.

doi:10.1103/physrevb.104.014504

Cited by 6 publications

(2 citation statements)

References 35 publications

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“…3) shows good agreement with the experimental data. Below T c there is a sharp drop in the relaxation rate without a Hebel-Slichter peak, which is also typical for iron-containing superconductors in general and FeSe in particular [31,36,38,[42][43][44].…”

Section: Nmrmentioning

confidence: 74%

Peculiarities of the nematic transition in FeSe0.675Te0.3S0.025 and its proximity to the quantum critical point

Ovchenkov,

Chareev,

Gippius

et al. 2024

Preprint

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In this work, we present the studies of structural phase transitions in FeSe0.675Te0.3S0.025 crystals. The data obtained indicate a significant change in the behavior of many characteristics during the transition in this composition compared to the case of the unsubstituted FeSe. The resistivity at low temperatures for the studied FeSe0.675Te0.3S0.025 is proportional to the square of the temperature, while for pure FeSe below the structural transition it depends almost linearly on temperature. 77Se NMR studies also confirm a change in the type of phase transition. The NMR data showed a noticeable line broadening below the structural transition and an anomaly in the temperature dependence of the relaxation rate, which was not observed in FeSe. Our results confirm the quantum criticality of Fe(Se,Te) at a low Te content or existence of the nematicity change point (NCP). This makes the phase diagram of quasi-binary Fe(Se,Te) compounds generally consistent with the phase diagram of FeSe under pressure. In both cases, there is a local minimum in the superconducting critical temperature near NCP and a strong increase in the superconducting critical temperature near the point of complete suppression of nematicity.

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Section: Nmrmentioning

confidence: 74%

Peculiarities of the nematic transition in FeSe0.675Te0.3S0.025 and its proximity to the quantum critical point

Ovchenkov,

Chareev,

Gippius

et al. 2024

Preprint

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show abstract

“…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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Peculiarities of the Nematic Transition in FeSe$$_{0.675}$$Te$$_{0.3}$$S$$_{0.025}$$ and Its Proximity to the Quantum Critical Point

Ovchenkov,

Chareev,

Gippius

et al. 2024

J Supercond Nov Magn

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Superconductivity of highly spin-polarized electrons in FeSe probed by Se77 NMR

Cited by 6 publications

References 35 publications

Peculiarities of the nematic transition in FeSe0.675Te0.3S0.025 and its proximity to the quantum critical point

Peculiarities of the nematic transition in FeSe0.675Te0.3S0.025 and its proximity to the quantum critical point

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

Peculiarities of the Nematic Transition in FeSe$$_{0.675}$$Te$$_{0.3}$$S$$_{0.025}$$ and Its Proximity to the Quantum Critical Point

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