Incoherent-coherent crossover and the pseudogap in Te-annealed superconducting<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Fe</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>+</mml:mo><mml:mi>y</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Te</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mi>x</mml:mi></mml:msub></mml:mrow></mml:math>revealed by magnetotransport measurements

Otsuka, Takumi; Hagisawa, Shotaro; Koshika, Yuta; Adachi, Shintaro; Usui, Tomohiro; Sasaki, Naosuke; Sasaki, Sanae; Yamaguchi, Shunpei; Nakanishi, Y.; Yoshizawa, Michito; Kimura, Shojiro; Watanabe, T.

doi:10.1103/physrevb.99.184505

Cited by 23 publications

(22 citation statements)

References 46 publications

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“…We also note that in a recent magneto-transport measurement, such coherent-incoherent crossover is also reported 69 . It has also been pointed out that this coherent-incoherent crossover temperature scale of the d xy orbital is coupled to the B 2g nematic susceptibility measured by elastoresistance, and hence suggests the potential important role played by the d xy orbital to nematicity in the FeSC 67 .…”

Section: Discussionsupporting

confidence: 74%

Correlation-driven electronic reconstruction in FeTe1−xSex

Huang

et al. 2022

Commun Phys

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Electronic correlation is of fundamental importance to high temperature superconductivity. While the low energy electronic states in cuprates are dominantly affected by correlation effects across the phase diagram, observation of correlation-driven changes in fermiology amongst the iron-based superconductors remains rare. Here we present experimental evidence for a correlation-driven reconstruction of the Fermi surface tuned independently by two orthogonal axes of temperature and Se/Te ratio in the iron chalcogenide family FeTe1−xSex. We demonstrate that this reconstruction is driven by the de-hybridization of a strongly renormalized dxy orbital with the remaining itinerant iron 3d orbitals in the emergence of an orbital-selective Mott phase. Our observations are further supported by our theoretical calculations to be salient spectroscopic signatures of such a non-thermal evolution from a strongly correlated metallic phase into an orbital-selective Mott phase in dxy as Se concentration is reduced.

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Section: Discussionsupporting

confidence: 74%

Correlation-driven electronic reconstruction in FeTe1−xSex

Huang

et al. 2022

Commun Phys

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“…We also note that in a recent magneto-transport measurement, such coherent-incoherent crossover is also reported [68]. It has also been pointed out that this coherent-incoherent crossover temperature scale of the d xy orbital is coupled to the B 2g nematic susceptibility measured by elastoresistance, and hence suggests the potential important role played by the d xy orbital to nematicity in the iron-based superconductors [66].…”

Section: Discussionsupporting

confidence: 71%

Correlation-Driven Electronic Reconstruction in FeTe$_{1-x}$Se$_x$

Huang,

Yu,

et al. 2022

Preprint

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Electronic correlation is of fundamental importance to high temperature superconductivity.While the low energy electronic states in cuprates are dominantly affected by correlation effects across the phase diagram, observation of correlation-driven changes in fermiology amongst the ironbased superconductors remains rare. Here we present experimental evidence for a correlation-driven reconstruction of the Fermi surface tuned independently by two orthogonal axes of temperature and Se/Te ratio in the iron chalcogenide family FeTe 1−x Se x . We demonstrate that this reconstruction is driven by the de-hybridization of a strongly renormalized d xy orbital with the remaining itinerant iron 3d orbitals in the emergence of an orbital-selective Mott phase. Our observations are further supported by our theoretical calculations to be salient spectroscopic signatures of such a non-thermal evolution from a strongly correlated metallic phase into an orbital-selective Mott phase in d xy as Se concentration is reduced.

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“…9 Furthermore, the temperature dependence of the magnetic susceptibilities χ of the Te-annealed Fe 1+y Te 1−x Se x single crystals exhibited sharp superconducting transitions (∆ T c ≤ 1 K) with onset temperatures corresponding to 12.1, 12.8, 13.7, and 14.5 K, for x = 0.15, 0.2, 0.3, and 0.4, respectively. 10 The data confirm that the superconducting properties of the Te-annealed samples are very good. Additionally, it should be noted that all the samples exhibit the Meissner signal (negative value in the FC data) although the signal is very weak, and this can be attributed to the sufficient removal of excess Fe by Te-annealing.…”

Section: Introductionsupporting

confidence: 63%

Electronic phase diagram of Fe$_{1+y}$Te$_{1-x}$Se$_{x}$ revealed by magnetotransport measurements

Watanabe,

Otsuka,

Hagisawa

et al. 2020

Preprint

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Among the Fe-based superconductors, Fe 1+y Te 1−x Sex is unique in that its crystal structure is the simplest and the electron correlation level is the strongest, and thus it is important to investigate the doping(x)-temperature (T ) phase diagram of this system. However, inevitably incorporated excess Fe currently prevents the establishment of the true phase diagram. We overcome the aforementioned significant problem via developing a new annealing method termed as "Te-annealing" wherein single crystals are annealed under Te vapor. Specifically, we conducted various magnetotransport measurements on Te-annealed superconducting Fe 1+y Te 1−x Sex. We observed that crossover from the incoherent to the coherent electronic state and opening of the pseudogap occurs at high temperatures (≈ 150 K for x = 0.2). This is accompanied by a more substantial pseudogap and the emergence of a phase with a multi-band nature at lower temperatures (below ≈ 50 K for x = 0.2) before superconductivity sets in. Based on the results, the third type electronic phase diagram in Fe-based high-Tc superconductors is revealed.

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Incoherent-coherent crossover and the pseudogap in Te-annealed superconductingFe1+yTe1−xSexrevealed by magnetotransport measurements

Cited by 23 publications

References 46 publications

Correlation-driven electronic reconstruction in FeTe1−xSex

Correlation-driven electronic reconstruction in FeTe1−xSex

Correlation-Driven Electronic Reconstruction in FeTe$_{1-x}$Se$_x$

Electronic phase diagram of Fe$_{1+y}$Te$_{1-x}$Se$_{x}$ revealed by magnetotransport measurements

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