Calorimetric evidence for two phase transitions in Ba$_{\rm 1-x}$K$_{\rm x}$Fe$_{2}$As$_{2}$ with fermion pairing and quadrupling states Article Swipe
Ilya Shipulin
,
Nadia Stegani
,
Ilaria Maccari
,
Kunihiro Kihou
,
Chul‐Ho Lee
,
Yongwei Li
,
Ruben Hühne
,
H.‐H. Klauß
,
M. Putti
,
Federico Caglieris
,
Egor Babaev
,
V. Grinenko
·
YOU?
·
· 2022
· Open Access
·
· DOI: https://doi.org/10.48550/arxiv.2212.13515
YOU?
·
· 2022
· Open Access
·
· DOI: https://doi.org/10.48550/arxiv.2212.13515
Theoretically, materials that break multiple symmetries allow, under certain conditions, the formation of four-fermion condensates above the superconducting critical temperature. Such states can be stabilized by phase fluctuations. Recently a fermionic quadrupling condensate that breaks the $Z_2$ time-reversal symmetry was reported in Ba$_{\rm 1-x}$K$_{\rm x}$Fe$_{2}$As$_{2}$ [V. Grinenko et al., Nat. Phys. 17, 1254 (2021)]. Evidence for the new state of matter comes from muon-spin rotation, transport, thermoelectric, and ultrasound experiments. Observing a specific heat anomaly is a very important signature of a transition to a new state of matter. However, a fluctuation-induced specific heat singularity is usually very challenging to resolve from a background of other contributions. Here, we report on detecting two anomalies in the specific heat of Ba$_{\rm 1-x}$K$_{\rm x}$Fe$_{2}$As$_{2}$ at zero magnetic field. The anomaly at the higher temperature is accompanied by the appearance of a spontaneous Nernst effect, indicating broken time-reversal ($Z_2$) symmetry. The second anomaly at the lower temperature coincides with the transition to a zero resistance state, indicating superconductivity breaking the $U(1)$ gauge symmetry. Our data provide calorimetric evidence for the $Z_2$ phase formation above the superconducting phase transition.
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- Type
- preprint
- Language
- en
- Landing Page
- http://arxiv.org/abs/2212.13515
- https://arxiv.org/pdf/2212.13515
- OA Status
- green
- References
- 22
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4313304948
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https://openalex.org/W4313304948Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.48550/arxiv.2212.13515Digital Object Identifier
- Title
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Calorimetric evidence for two phase transitions in Ba$_{\rm 1-x}$K$_{\rm x}$Fe$_{2}$As$_{2}$ with fermion pairing and quadrupling statesWork title
- Type
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preprintOpenAlex work type
- Language
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enPrimary language
- Publication year
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2022Year of publication
- Publication date
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2022-12-27Full publication date if available
- Authors
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Ilya Shipulin, Nadia Stegani, Ilaria Maccari, Kunihiro Kihou, Chul‐Ho Lee, Yongwei Li, Ruben Hühne, H.‐H. Klauß, M. Putti, Federico Caglieris, Egor Babaev, V. GrinenkoList of authors in order
- Landing page
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https://arxiv.org/abs/2212.13515Publisher landing page
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https://arxiv.org/pdf/2212.13515Direct link to full text PDF
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YesWhether a free full text is available
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greenOpen access status per OpenAlex
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https://arxiv.org/pdf/2212.13515Direct OA link when available
- Concepts
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Physics, Condensed matter physics, Superconductivity, Pairing, Fermion, Anomaly (physics), Muon spin spectroscopy, Phase transition, T-symmetry, Symmetry breaking, Quantum mechanicsTop concepts (fields/topics) attached by OpenAlex
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0Total citation count in OpenAlex
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22Number of works referenced by this work
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10Other works algorithmically related by OpenAlex
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