Anisotropic magnetic interactions in a candidate Kitaev spin liquid close to a metal-insulator transition

Autor: Zeyu Ma, Danrui Ni, David A. S. Kaib, Kylie MacFarquharson, John S. Pearce, Robert J. Cava, Roser Valentí, Radu Coldea, Amalia I. Coldea

Publikováno v: Communications Physics, Vol 7, Iss 1, Pp 1-8 (2024)

Abstract In the Kitaev honeycomb model, spins coupled by strongly-frustrated anisotropic interactions do not order at low temperature but instead form a quantum spin liquid with spin fractionalisation into Majorana fermions and static fluxes. The rea

Externí odkaz: https://doaj.org/article/3cec81933297499e87b01a205dc90db5

Electronic Nematic States Tuned by Isoelectronic Substitution in Bulk FeSe1−xSx

Autor: Amalia I. Coldea

Publikováno v: Frontiers in Physics, Vol 8 (2021)

Isoelectronic substitution is an ideal tuning parameter to alter electronic states and correlations in iron-based superconductors. As this substitution takes place outside the conducting Fe planes, the electronic behaviour is less affected by the imp

Externí odkaz: https://doaj.org/article/1315a20f0ff74b7095f3a3aeda7a8b8a

Robust superconductivity and fragile magnetism induced by the strong Cu impurity scattering in the high-pressure phase of FeSe

Autor: Z. Zajicek, S. J. Singh, A. I. Coldea

Superconductivity in FeSe is strongly enhanced under applied pressure and it is proposed to emerge from anomalously coupled structural and magnetic phases. Small impurities inside the Fe plane can strongly disrupt the pair formation in FeSe at ambien

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4487dbc6fc383b2f69d6a9e633fea22f
http://arxiv.org/abs/2212.06128

Unconventional localization of electrons inside of a nematic electronic phase

Autor: Liam S. Farrar, Zachary Zajicek, Archie B. Morfoot, Matthew Bristow, Oliver S. Humphries, Amir A. Haghighirad, Alix McCollam, Simon J. Bending, Amalia I. Coldea

Publikováno v: Farrar, L S, Zajicek, Z, Morfoot, A B, Bristow, M, Humphries, O S, Haghighirad, A A, McCollam, A, Bending, S J & Coldea, A I 2022, ' Unconventional localization of electrons inside of a nematic electronic phase ', Proceedings of the National Academy of Sciences of the United States of America, vol. 119, no. 43, e2200405119 . https://doi.org/10.1073/pnas.2200405119
Proceedings of the National Academy of Sciences USA, 119, 43, pp. 1-8
Proceedings of the National Academy of Sciences USA, 119, 1-8

The magnetotransport behaviour inside the nematic phase of bulk FeSe reveals unusual multiband effects that cannot be reconciled with a simple two-band approximation proposed by surface-sensitive spectroscopic probes. In order to understand the role

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4b0418715945b3631be8760bf30c1b98
https://doi.org/10.1073/pnas.2200405119

Signatures of a quantum Griffiths phase close to an electronic nematic quantum phase transition

Autor: Pascal Reiss, David Graf, Amir A. Haghighirad, Thomas Vojta, Amalia I. Coldea

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 inve

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::10bb68a669da1d79eb1d896e25b4675e
https://doi.org/10.1103/physrevlett.127.246402