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Quantum oscillations

Amalia Coldea

Professor of Physics

Research theme

  • Quantum materials

Sub department

  • Condensed Matter Physics

Research groups

  • Quantum matter in high magnetic fields
amalia.coldea@physics.ox.ac.uk
Telephone: 01865 (2)82196
Clarendon Laboratory, room 251,265,264,166
orcid.org/0000-0002-6732-5964
  • About
  • Research
  • Teaching
  • Selected invited lectures
  • Prizes, awards and recognition
  • Publications

Formation of Hubbard-like bands as a fingerprint of strong electron-electron interactions in FeSe

(2016)

Authors:

Matthew D Watson, Steffen Backes, Amir A Haghighirad, Moritz Hoesch, Timur K Kim, Amalia I Coldea, Roser Valenti
More details from the publisher

A de Haas van Alphen study of the role of 4f electrons in antiferromagnetic CeZn11 as compared to its non-magnetic analogue LaZn11

(2016)

Authors:

SF Blake, H Hodovanets, A McCollam, SL Bud'ko, PC Canfield, AI Coldea
More details from the publisher

de Haas–van Alphen study of role of4felectrons in antiferromagneticCeZn11as compared to its nonmagnetic analogLaZn11

Physical Review B American Physical Society (APS) 94:23 (2016) 235103

Authors:

SF Blake, H Hodovanets, A McCollam, SL Bud'ko, PC Canfield, AI Coldea
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Evolution of the Fermi surface of the nematic superconductors FeSe1-xSx

(2016)

Authors:

AI Coldea, SF Blake, S Kasahara, AA Haghighirad, MD Watson, W Knafo, ES Choi, A McCollam, P Reiss, T Yamashita, M Bruma, S Speller, Y Matsuda, T Wolf, T Shibauchi, AJ Schofield
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Evidence for unidirectional nematic bond ordering in FeSe

Physical Review B American Physical Society 94:20 (2016)

Authors:

MD Watson, TK Kim, LC Rhodes, M Eschrig, M Hoesch, Amir-Abbas Haghighirad, Amalia Coldea

Abstract:

The presence of dxz−dyz orbital ordering is often considered a hallmark of the nematic phase of Fe-based superconductors, including FeSe, but the details of the order parameter remain controversial. Here, we report a high-resolution angle-resolved photoemission spectroscopy study of single crystals of FeSe, accounting for the photon-energy dependence and making a detailed analysis of the temperature dependence. We find that the hole pocket undergoes a fourfold-symmetry-breaking distortion in the nematic phase below 90 K, but, in contrast, the changes to the electron pockets do not require fourfold symmetry breaking. Instead, there is an additional separation of the existing dxy and dxz/yz bands, which themselves are not split within resolution. These observations lead us to propose a scenario of “unidirectional nematic bond ordering” to describe the low-temperature electronic structure of FeSe, supported by good agreement with ten-orbital tight-binding model calculations.
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