Evolution of the low-temperature Fermi surface of superconducting FeSe1−xSx across a nematic phase transition

Amalia I. Coldea; Samuel F. Blake; Shigeru Kasahara; Amir A. Haghighirad; Matthew D. Watson; William Knafo; Eun Sang Choi; Alix McCollam; Pascal Reiss; Takuya Yamashita; Mara Bruma; Susannah C. Speller; Yuji Matsuda; Thomas Wolf; Takasada Shibauchi; Andrew J. Schofield

doi:10.1038/s41535-018-0141-0

Evolution of the low-temperature Fermi surface of superconducting FeSe_1−xS_x across a nematic phase transition

Amalia I. Coldea, Samuel F. Blake, Shigeru Kasahara, Amir A. Haghighirad, Matthew D. Watson, William Knafo, Eun Sang Choi, Alix McCollam, Pascal Reiss, Takuya Yamashita, Mara Bruma, Susannah C. Speller, Yuji Matsuda, Thomas Wolf, Takasada Shibauchi, Andrew J. Schofield

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Abstract

The existence of a nematic phase transition in iron-chalcogenide superconductors poses an intriguing question about its impact on superconductivity. To understand the nature of this unique quantum phase transition, it is essential to study how the electronic structure changes across this transition at low temperatures. Here, we investigate the evolution of the Fermi surfaces and electronic interactions across the nematic phase transition of FeSe_1−xS_x using Shubnikov-de Haas oscillations in high magnetic fields up to 45 T in the low temperature regime down to 0.4 K. Most of the Fermi surfaces of FeSe_1−xS_x monotonically increase in size except for a prominent low frequency oscillation associated with a small, but highly mobile band, which disappears at the nematic phase boundary near x ~ 0.17, indicative of a topological Lifshitz transition. The quasiparticle masses are larger inside the nematic phase, indicative of a strongly correlated state, but they become suppressed outside it. The experimentally observed changes in the Fermi surface topology, together with the varying degree of electronic correlations, will change the balance of electronic interactions in the multi-band system FeSe_1−xS_x and promote different k_z-dependent superconducting pairing channels inside and outside the nematic phase.

Original language	English
Article number	2
Number of pages	7
Journal	npj Quantum Materials
Volume	4
Issue number	1
Early online date	4 Jan 2019
DOIs	https://doi.org/10.1038/s41535-018-0141-0
Publication status	E-pub ahead of print - 4 Jan 2019

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Copyright © The Author(s) 2019. Published in partnership with Nanjing University. Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
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Quantum oscillations in the nematic superconductors FeSe1-xSx
Coldea, A. I. (Creator), Blake, S. F. (Creator), Kasahara, S. (Creator), Haghighirad, A. A. (Creator), Watson, M. D. (Creator), Knafo, W. (Creator), Choi, E. S. (Creator), McCollam, A. (Creator), Reiss, P. (Creator), Yamashita, T. (Creator), Bruma, M. (Creator), Speller, S. C. (Creator), Matsuda, Y. (Creator), Wolf, T. (Creator), Shibauchi, T. (Creator) & Schofield, A. J. (Creator), University of Oxford, 2018
DOI: 10.5287/bodleian:wxAGnOgv6
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Coldea, A. I., Blake, S. F., Kasahara, S., Haghighirad, A. A., Watson, M. D., Knafo, W., Choi, E. S., McCollam, A., Reiss, P., Yamashita, T., Bruma, M., Speller, S. C., Matsuda, Y., Wolf, T., Shibauchi, T., & Schofield, A. J. (2019). Evolution of the low-temperature Fermi surface of superconducting FeSe_1−xS_x across a nematic phase transition. npj Quantum Materials, 4(1), Article 2. Advance online publication. https://doi.org/10.1038/s41535-018-0141-0

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title = "Evolution of the low-temperature Fermi surface of superconducting FeSe1−xSx across a nematic phase transition",

abstract = "The existence of a nematic phase transition in iron-chalcogenide superconductors poses an intriguing question about its impact on superconductivity. To understand the nature of this unique quantum phase transition, it is essential to study how the electronic structure changes across this transition at low temperatures. Here, we investigate the evolution of the Fermi surfaces and electronic interactions across the nematic phase transition of FeSe1−xSx using Shubnikov-de Haas oscillations in high magnetic fields up to 45 T in the low temperature regime down to 0.4 K. Most of the Fermi surfaces of FeSe1−xSx monotonically increase in size except for a prominent low frequency oscillation associated with a small, but highly mobile band, which disappears at the nematic phase boundary near x ~ 0.17, indicative of a topological Lifshitz transition. The quasiparticle masses are larger inside the nematic phase, indicative of a strongly correlated state, but they become suppressed outside it. The experimentally observed changes in the Fermi surface topology, together with the varying degree of electronic correlations, will change the balance of electronic interactions in the multi-band system FeSe1−xSx and promote different kz-dependent superconducting pairing channels inside and outside the nematic phase.",

author = "Coldea, {Amalia I.} and Blake, {Samuel F.} and Shigeru Kasahara and Haghighirad, {Amir A.} and Watson, {Matthew D.} and William Knafo and Choi, {Eun Sang} and Alix McCollam and Pascal Reiss and Takuya Yamashita and Mara Bruma and Speller, {Susannah C.} and Yuji Matsuda and Thomas Wolf and Takasada Shibauchi and Schofield, {Andrew J.}",

note = "This work was mainly supported by EPSRC (EP/L001772/1, EP/I004475/1, EP/I017836/1). A.A.H. acknowledges the financial support of the Oxford Quantum Materials Platform Grant (EP/M020517/1). A portion of this work was performed at the National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreement No. DMR-1157490 and the State of Florida. This research was supported in part by the National Science Foundation under Grant No. NSF PHY17-48958. Part of this work was supported by HFML-RU/FOM and LNCMI-CNRS, members of the European Magnetic Field Laboratory (EMFL) and by EPSRC (UK) via its membership to the EMFL (grant no. EP/N01085X/1). Part of this work was supported by Programme Investissements d{\textquoteright} Avenir under the programme ANR-11-IDEX-0002-02, reference ANR-10-LABX-0037-NEXT. The authors would like to acknowledge the use of the University of Oxford Advanced Research Computing (ARC) facility in carrying out part of this work. A.I.C. thanks the hospitality of KITP supported by the National Science Foundation under Grant No. NSF PHY- 1125915. A.I.C. acknowledges an EPSRC Career Acceleration Fellowship (EP/I004475/1).",

year = "2019",

month = jan,

day = "4",

doi = "10.1038/s41535-018-0141-0",

language = "English",

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Coldea, AI, Blake, SF, Kasahara, S, Haghighirad, AA, Watson, MD, Knafo, W, Choi, ES, McCollam, A, Reiss, P, Yamashita, T, Bruma, M, Speller, SC, Matsuda, Y, Wolf, T, Shibauchi, T & Schofield, AJ 2019, 'Evolution of the low-temperature Fermi surface of superconducting FeSe_1−xS_x across a nematic phase transition', npj Quantum Materials, vol. 4, no. 1, 2. https://doi.org/10.1038/s41535-018-0141-0

TY - JOUR

T1 - Evolution of the low-temperature Fermi surface of superconducting FeSe1−xSx across a nematic phase transition

AU - Coldea, Amalia I.

AU - Blake, Samuel F.

AU - Kasahara, Shigeru

AU - Haghighirad, Amir A.

AU - Watson, Matthew D.

AU - Knafo, William

AU - Choi, Eun Sang

AU - McCollam, Alix

AU - Reiss, Pascal

AU - Yamashita, Takuya

AU - Bruma, Mara

AU - Speller, Susannah C.

AU - Matsuda, Yuji

AU - Wolf, Thomas

AU - Shibauchi, Takasada

AU - Schofield, Andrew J.

N1 - This work was mainly supported by EPSRC (EP/L001772/1, EP/I004475/1, EP/I017836/1). A.A.H. acknowledges the financial support of the Oxford Quantum Materials Platform Grant (EP/M020517/1). A portion of this work was performed at the National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreement No. DMR-1157490 and the State of Florida. This research was supported in part by the National Science Foundation under Grant No. NSF PHY17-48958. Part of this work was supported by HFML-RU/FOM and LNCMI-CNRS, members of the European Magnetic Field Laboratory (EMFL) and by EPSRC (UK) via its membership to the EMFL (grant no. EP/N01085X/1). Part of this work was supported by Programme Investissements d’ Avenir under the programme ANR-11-IDEX-0002-02, reference ANR-10-LABX-0037-NEXT. The authors would like to acknowledge the use of the University of Oxford Advanced Research Computing (ARC) facility in carrying out part of this work. A.I.C. thanks the hospitality of KITP supported by the National Science Foundation under Grant No. NSF PHY- 1125915. A.I.C. acknowledges an EPSRC Career Acceleration Fellowship (EP/I004475/1).

PY - 2019/1/4

Y1 - 2019/1/4

N2 - The existence of a nematic phase transition in iron-chalcogenide superconductors poses an intriguing question about its impact on superconductivity. To understand the nature of this unique quantum phase transition, it is essential to study how the electronic structure changes across this transition at low temperatures. Here, we investigate the evolution of the Fermi surfaces and electronic interactions across the nematic phase transition of FeSe1−xSx using Shubnikov-de Haas oscillations in high magnetic fields up to 45 T in the low temperature regime down to 0.4 K. Most of the Fermi surfaces of FeSe1−xSx monotonically increase in size except for a prominent low frequency oscillation associated with a small, but highly mobile band, which disappears at the nematic phase boundary near x ~ 0.17, indicative of a topological Lifshitz transition. The quasiparticle masses are larger inside the nematic phase, indicative of a strongly correlated state, but they become suppressed outside it. The experimentally observed changes in the Fermi surface topology, together with the varying degree of electronic correlations, will change the balance of electronic interactions in the multi-band system FeSe1−xSx and promote different kz-dependent superconducting pairing channels inside and outside the nematic phase.

AB - The existence of a nematic phase transition in iron-chalcogenide superconductors poses an intriguing question about its impact on superconductivity. To understand the nature of this unique quantum phase transition, it is essential to study how the electronic structure changes across this transition at low temperatures. Here, we investigate the evolution of the Fermi surfaces and electronic interactions across the nematic phase transition of FeSe1−xSx using Shubnikov-de Haas oscillations in high magnetic fields up to 45 T in the low temperature regime down to 0.4 K. Most of the Fermi surfaces of FeSe1−xSx monotonically increase in size except for a prominent low frequency oscillation associated with a small, but highly mobile band, which disappears at the nematic phase boundary near x ~ 0.17, indicative of a topological Lifshitz transition. The quasiparticle masses are larger inside the nematic phase, indicative of a strongly correlated state, but they become suppressed outside it. The experimentally observed changes in the Fermi surface topology, together with the varying degree of electronic correlations, will change the balance of electronic interactions in the multi-band system FeSe1−xSx and promote different kz-dependent superconducting pairing channels inside and outside the nematic phase.

U2 - 10.1038/s41535-018-0141-0

DO - 10.1038/s41535-018-0141-0

M3 - Article

SN - 2397-4648

VL - 4

JO - npj Quantum Materials

JF - npj Quantum Materials

IS - 1

M1 - 2

ER -

Evolution of the low-temperature Fermi surface of superconducting FeSe1−xSx across a nematic phase transition

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Quantum oscillations in the nematic superconductors FeSe1-xSx

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Evolution of the low-temperature Fermi surface of superconducting FeSe_1−xS_x across a nematic phase transition