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- W4313304948 abstract "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." @default.
- W4313304948 created "2023-01-06" @default.
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- W4313304948 date "2022-12-27" @default.
- W4313304948 modified "2023-10-16" @default.
- W4313304948 title "Calorimetric evidence for two phase transitions in Ba$_{rm 1-x}$K$_{rm x}$Fe$_{2}$As$_{2}$ with fermion pairing and quadrupling states" @default.
- W4313304948 doi "https://doi.org/10.48550/arxiv.2212.13515" @default.
- W4313304948 hasPublicationYear "2022" @default.
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