NMR study under pressure on the iron-based superconductor FeSe1−xSx (x = 0.12 and 0.23): Relationship between nematicity and AF fluctuations

Kuwayama, Takanori; Matsuura, Kohei; Mizukami, Y.; Kasahara, S.; Matsuda, Yuji; Shibauchi, T.; Uwatoko, Yoshiya; Fujiwara, Naoki

doi:10.1142/s0217984920400485

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…This has an advantage because p is known as one of the clean tuning parameters which control the ground state without changing the composition avoiding any additional effects of S substitutions such as homogeneity by changing x. Several 77 Se NMR studies on single crystalline FeSe 1−x S x under pressure have been carried out [37,38,41,59]. Here we show the results of NMR measurements under pressure up to 2.1 GPa on x = 0.09 whose p-T phase diagram is shown in Figure 2A reported in Ref.…”

Section: Antiferromagnetic Fluctuations and Superconductivity Without...mentioning

confidence: 99%

Relationship Between Nematicity, Antiferromagnetic Fluctuations, and Superconductivity in FeSe1−xSx Revealed by NMR

Rana

Furukawa

2022

Front. Phys.

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The S-substituted FeSe, FeSe1−xSx, under pressure (p), provides a versatile platform for studying the relationship among nematicity, antiferromagnetism, and superconductivity. Here we present a short review of the recent experimental evidence showing that nematicity has a remarkable impact on the relationship between antiferromagnetic fluctuations and superconductivity. This has been revealed by several 77Se nuclear magnetic resonance studies that have tracked the variability of antiferromagnetic fluctuations and superconducting transition temperature (Tc) as a function of x and p. Tc is roughly proportional to antiferromagnetic fluctuations in the presence or absence of nematic order suggesting the importance of antiferromagnetic fluctuations in the Cooper pairing mechanism in FeSe1−xSx. However, the antiferromagnetic fluctuations are more effective in enhancing superconductivity in the absence of nematicity as compared to when it is present. These experimental observations give renewed insights into the interrelationships between nematicity, magnetism, and superconductivity in Fe-based superconductors.

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Section: Antiferromagnetic Fluctuations and Superconductivity Without...mentioning

confidence: 99%

Relationship Between Nematicity, Antiferromagnetic Fluctuations, and Superconductivity in FeSe1−xSx Revealed by NMR

Rana

Furukawa

2022

Front. Phys.

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Unusual crossover from Bardeen-Cooper-Schrieffer to Bose-Einstein-condensate superconductivity in iron chalcogenides

et al. 2023

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The BCS-BEC (Bardeen-Cooper-Schrieffer–Bose-Einstein-condensate) crossover from strongly overlapping Cooper pairs to non-overlapping composite bosons in the strong coupling limit has been a long-standing issue of interacting many-body fermion systems. Recently, FeSe semimetal with hole and electron bands emerged as a high-transition-temperature (high-Tc) superconductor located in the BCS-BEC crossover regime, owing to its very small Fermi energies. In FeSe, however, an ordinary BCS-like heat-capacity jump is observed at Tc, posing a fundamental question on the characteristics of the BCS-BEC crossover. Here we report on high-resolution heat capacity, magnetic torque, and scanning tunneling spectroscopy measurements in FeSe1−xSx. Upon entering the tetragonal phase at x > 0.17, where nematic order is suppressed, Tc discontinuously decreases. In this phase, highly non-mean-field behaviours consistent with BEC-like pairing are found in the thermodynamic quantities with giant superconducting fluctuations extending far above Tc, implying the change of pairing nature. Moreover, the pseudogap formation, which is expected in BCS-BEC crossover of single-band superconductors, is not observed in the tunneling spectra. These results illuminate highly unusual features of the superconducting states in the crossover regime with multiband electronic structure and competing electronic instabilities.

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Interrelationships between nematicity, antiferromagnetic spin fluctuations, and superconductivity: Role of hotspots in FeSe1−xSx revealed by high pressure
Rana
¹
,
Ambika
²
,
Bud’ko
³

et al. 2023
Phys. Rev. B
5
0
0
0
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NMR study under pressure on the iron-based superconductor FeSe1−xSx (x = 0.12 and 0.23): Relationship between nematicity and AF fluctuations

Abstract: We performed [Formula: see text]-nuclear magnetic resonance measurements on [Formula: see text] ([Formula: see text] = 0.12 and 0.23). We found from the relaxation time [Formula: see text] that nematicity and antiferromagnetic fluctuations show cooperative coupling.

Cited by 3 publications

References 13 publications

Relationship Between Nematicity, Antiferromagnetic Fluctuations, and Superconductivity in FeSe1−xSx Revealed by NMR

Relationship Between Nematicity, Antiferromagnetic Fluctuations, and Superconductivity in FeSe1−xSx Revealed by NMR

Unusual crossover from Bardeen-Cooper-Schrieffer to Bose-Einstein-condensate superconductivity in iron chalcogenides

Interrelationships between nematicity, antiferromagnetic spin fluctuations, and superconductivity: Role of hotspots in FeSe1−xSx revealed by high pressure
Rana
¹
,
Ambika
²
,
Bud’ko
³

et al. 2023
Phys. Rev. B
5
0
0
0
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NMR study under pressure on the iron-based superconductor FeSe1−xSx (x = 0.12 and 0.23): Relationship between nematicity and AF fluctuations

Abstract: We performed [Formula: see text]-nuclear magnetic resonance measurements on [Formula: see text] ([Formula: see text] = 0.12 and 0.23). We found from the relaxation time [Formula: see text] that nematicity and antiferromagnetic fluctuations show cooperative coupling.

Cited by 3 publications

References 13 publications

Relationship Between Nematicity, Antiferromagnetic Fluctuations, and Superconductivity in FeSe1−xSx Revealed by NMR

Relationship Between Nematicity, Antiferromagnetic Fluctuations, and Superconductivity in FeSe1−xSx Revealed by NMR

Unusual crossover from Bardeen-Cooper-Schrieffer to Bose-Einstein-condensate superconductivity in iron chalcogenides

Interrelationships between nematicity, antiferromagnetic spin fluctuations, and superconductivity: Role of hotspots in FeSe1−xSx revealed by high pressure Rana1, Ambika2, Bud’ko3 et al. 2023Phys. Rev. B5000View full textAdd to dashboardCite

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Interrelationships between nematicity, antiferromagnetic spin fluctuations, and superconductivity: Role of hotspots in FeSe1−xSx revealed by high pressure
Rana
¹
,
Ambika
²
,
Bud’ko
³

et al. 2023
Phys. Rev. B
5
0
0
0
View full text Add to dashboard Cite