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 FeSe0.89S0.11 using applied hydrostatic pressure. We report an unusual crossing of the magneto resistivity isotherms in the Non superconducting 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 Nemat elastic coupling and a Lifshitz transition that changes the topology of the Fermi surface.
Recommended Citation
P. Reiss et al., "Signatures of a Quantum Griffiths Phase Close to an Electronic Nematic Quantum Phase Transition," Physical Review Letters, vol. 127, no. 24, article no. 246402, American Physical Society, Dec 2021.
The definitive version is available at https://doi.org/10.1103/PhysRevLett.127.246402
Department(s)
Physics
International Standard Serial Number (ISSN)
1079-7114; 0031-9007
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 American Physical Society, All rights reserved.
Publication Date
10 Dec 2021
PubMed ID
34951778
Included in
Condensed Matter Physics Commons, Statistical, Nonlinear, and Soft Matter Physics Commons
Comments
National Science Foundation, Grant EP/M020517/1