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Quantum oscillations

Amalia Coldea

Associate Professor

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
  • Prizes, awards and recognition
  • Selected invited lectures
  • Publications

Drastic effect of impurity scattering on the electronic and superconducting properties of Cu-doped FeSe

Physical Review B American Physical Society (APS) 105:11 (2022) 115130

Authors:

Z Zajicek, Sj Singh, H Jones, P Reiss, M Bristow, A Martin, A Gower, A McCollam, Ai Coldea
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The drastic effect of the impurity scattering on the electronic and superconducting properties of Cu-doped FeSe

ArXiv 2203.04624 (2022)

Authors:

Z Zajicek, SJ Singh, H Jones, P Reiss, M Bristow, A Martin, A Gower, A McCollam, AI Coldea
Details from ArXiV

Ironing out the details of unconventional superconductivity

ArXiv 2201.02095 (2022)

Authors:

Rafael M Fernandes, Amalia I Coldea, Hong Ding, Ian R Fisher, PJ Hirschfeld, Gabriel Kotliar
Details from ArXiV

Iron pnictides and chalcogenides: a new paradigm for superconductivity

Nature Nature Research 601 (2022) 35-44

Authors:

Rafael M Fernandes, Amalia Coldea, Hong Ding, Ian R Fisher, Pj Hirschfeld, Gabriel Kotliar

Abstract:

Superconductivity is a remarkably widespread phenomenon that is observed in most metals cooled to very low temperatures. The ubiquity of such conventional superconductors, and the wide range of associated critical temperatures, is readily understood in terms of the well-known Bardeen–Cooper–Schrieffer theory. Occasionally, however, unconventional superconductors are found, such as the iron-based materials, which extend and defy this understanding in unexpected ways. In the case of the iron-based superconductors, this includes the different ways in which the presence of multiple atomic orbitals can manifest in unconventional superconductivity, giving rise to a rich landscape of gap structures that share the same dominant pairing mechanism. In addition, these materials have also led to insights into the unusual metallic state governed by the Hund’s interaction, the control and mechanisms of electronic nematicity, the impact of magnetic fluctuations and quantum criticality, and the importance of topology in correlated states. Over the fourteen years since their discovery, iron-based superconductors have proven to be a testing ground for the development of novel experimental tools and theoretical approaches, both of which have extensively influenced the wider field of quantum materials.
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Signatures of a quantum Griffiths phase close to an electronic nematic quantum phase transition

Physical Review Letters American Physical Society 127:24 (2021) 246402

Authors:

Pascal Reiss, David Graf, Amir Haghighirad, Thomas Vojta, Amalia Coldea

Abstract:

In the vicinity of a quantum critical point, quenched disorder can lead to a quantum Griffiths phase, accompanied by an exotic power-law scaling with a continuously varying dynamical exponent that diverges in the zero-temperature limit. Here, we investigate a nematic quantum critical point in the iron-based superconductor FeSe 0.89 S 0.11 using applied hydrostatic pressure. We report an unusual crossing of the magnetoresistivity isotherms in the nonsuperconducting normal state that features a continuously varying dynamical exponent over a large temperature range. We interpret our results in terms of a quantum Griffiths phase caused by nematic islands that result from the local distribution of Se and S atoms. At low temperatures, the Griffiths phase is masked by the emergence of a Fermi liquid phase due to a strong nematoelastic coupling and a Lifshitz transition that changes the topology of the Fermi surface.
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