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Multi-band description of the upper critical field of bulk FeSe

Autor: Bristow, M., Gower, A., Prentice, J. C. A., Watson, M. D., Zajicek, Z., Blundell, S. J., Haghighirad, A. A., McCollam, A., Coldea, A. I.

Publikováno v: Phys. Rev. B 108, 184507 (2023)

The upper critical field of multi-band superconductors can be an essential quantity to unravel the nature of superconducting pairing and its interplay with the electronic structure. Here we experimentally map out the complete upper critical field pha

Externí odkaz: http://arxiv.org/abs/2311.04188

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Unconventional localization of electrons inside of a nematic electronic phase

Autor: Farrar, L., Zajicek, Z., Morfoot, A. B., Bristow, M., Humphries, O. S., Haghighirad, A. A., McCollam, A., Bending, S. J., Coldea, A. I.

Publikováno v: PNAS Vol.119 No.43 e220040511 (2022)

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: http://arxiv.org/abs/2212.06196

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

Autor: Zajicek, Z., Singh, S. J., Jones, H., Reiss, P., Bristow, M., Martin, A., Gower, A., McCollam, A., Coldea, A. I.

Publikováno v: Phys. Rev. B 105, 115130(2022)

Non-magnetic impurities in iron-based superconductors can provide an important tool to understand the pair symmetry and they can influence significantly the transport and the superconducting behaviour. Here, we present a study of the role of strong i

Externí odkaz: http://arxiv.org/abs/2203.04624

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Quantum oscillations probe the Fermi surface topology of the nodal-line semimetal CaAgAs

Autor: Kwan, Y. H., Reiss, P., Han, Y., Bristow, M., Prabhakaran, D., Graf, D., McCollam, A., Parameswaran, S. A., Coldea, A. I.

Publikováno v: Phys. Rev. Research 2, 012055 (2020)

Nodal semimetals are a unique platform to explore topological signatures of the unusual band structure that can manifest by accumulating a nontrivial phase in quantum oscillations. Here we report a study of the de Haasvan Alphen oscillations of the c

Externí odkaz: http://arxiv.org/abs/2001.02434

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Anomalous high-magnetic field electronic state of the nematic superconductors FeSe$_{1-x}$S$_x$

Autor: Bristow, M., Reiss, P., Haghighirad, A. A., Zajicek, Z., Singh, S. J., Wolf, T., Graf, D., Knafo, W., McCollam, A., Coldea, A. I.

Publikováno v: Phys. Rev. Research 2, 013309 (2020)

Understanding superconductivity requires detailed knowledge of the normal electronic state from which it emerges. A nematic electronic state that breaks the rotational symmetry of the lattice can potentially promote unique scattering relevant for sup

Externí odkaz: http://arxiv.org/abs/1904.02522

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Quenched nematic criticality separating two superconducting domes in an iron-based superconductor under pressure

Autor: Reiss, P., Graf, D., Haghighirad, A. A., Knafo, W., Drigo, L., Bristow, M., Schofield, A. J., Coldea, A. I.

Publikováno v: Nature Physics (2019)

The nematic electronic state and its associated nematic critical fluctuations have emerged as potential candidates for superconducting pairing in various unconventional superconductors. However, in most materials their coexistence with other magnetic

Externí odkaz: http://arxiv.org/abs/1902.11276

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An ideal Weyl semimetal induced by magnetic exchange

Autor: Soh, J. -R., de Juan, F., Vergniory, M. G., Schröter, N. B. M., Rahn, M. C., Yan, D. Y., Jiang, J., Bristow, M., Reiss, P., Blandy, J. N., Guo, Y. F., Shi, Y. G., Kim, T. K., McCollam, A., Simon, S. H., Chen, Y., Coldea, A. I., Boothroyd, A. T.

Publikováno v: Phys. Rev. B 100, 201102 (2019)

Weyl semimetals exhibit exceptional quantum electronic transport due to the presence of topologically-protected band crossings called Weyl nodes. The nodes come in pairs with opposite chirality, but their number and location in momentum space is othe

Externí odkaz: http://arxiv.org/abs/1901.10022

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Evidence for $J_{\rm eff} = 0$ ground state and defect-induced spin glass behaviour in the pyrochlore osmate Y$_{2}$Os$_{2}$O$_{7}$

Autor: Davies, N. R., Topping, C. V., Jacobsen, H., Princep, A. J., Kirschner, F. K. K., Rahn, M. C., Bristow, M., Vale, J. G., da Silva, I., Baker, P. J., Sahle, Ch. J., Guo, Y. -F., Yan, D. -Y., Shi, Y. -G., Blundell, S. J., McMorrow, D. F., Boothroyd, A. T.

Publikováno v: Phys. Rev. B 99, 174442 (2019)

We present AC and DC magnetometry, heat capacity, muon spin relaxation ($\mu$SR) and resonant inelastic X-ray scattering (RIXS) studies of the pyrochlore osmate Y$_2$Os$_2$O$_7$. We observe a non-zero effective moment governed by $\sqrt{f}\mu_{\rm{ef

Externí odkaz: http://arxiv.org/abs/1808.01530

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