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Calorimetric evidence for two phase transitions in Calorimetric evidence for two phase transitions in Ba1−xKxFe2As2 with fermion pairing and quadrupling states

Shipulin, Ilya (författare)
Institute for Metallic Materials, Leibniz-IFW Dresden, D-01069, Dresden, Germany; Institute for Solid State and Materials Physics, Technische Universität Dresden, D-01069, Dresden, Germany
Stegani, Nadia (författare)
University of Genoa, Via Dodecaneso 33, 16146, Genoa, Italy; Consiglio Nazionale delle Ricerche (CNR)-SPIN, Corso Perrone 24, 16152, Genova, Italy
Maccari, Ilaria (författare)
KTH,Kondenserade materiens teori,Laboratory for Theoretical and Computational Physics, Paul Scherrer Institute, 5232, Villigen PSI, Switzerlanderland
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Kihou, Kunihiro (författare)
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, 305-8568, Japan
Lee, Chul Ho (författare)
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, 305-8568, Japan
Hu, Quanxin (författare)
Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, 201210, China
Zheng, Yu (författare)
Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, 201210, China
Yang, Fazhi (författare)
Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, 201210, China
Li, Yongwei (författare)
Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, 201210, China
Yim, Chi Ming (författare)
Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, 201210, China; School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, China
Hühne, Ruben (författare)
Institute for Metallic Materials, Leibniz-IFW Dresden, D-01069, Dresden, Germany
Klauss, Hans Henning (författare)
Institute for Solid State and Materials Physics, Technische Universität Dresden, D-01069, Dresden, Germany
Putti, Marina (författare)
University of Genoa, Via Dodecaneso 33, 16146, Genoa, Italy; Consiglio Nazionale delle Ricerche (CNR)-SPIN, Corso Perrone 24, 16152, Genova, Italy
Caglieris, Federico (författare)
University of Genoa, Via Dodecaneso 33, 16146, Genoa, Italy; Consiglio Nazionale delle Ricerche (CNR)-SPIN, Corso Perrone 24, 16152, Genova, Italy; Institute for Solid State Research, Leibniz-IFW Dresden, D-01069, Dresden, Germany
Babaev, Egor (författare)
KTH,Kondenserade materiens teori
Grinenko, Vadim (författare)
Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, 201210, China; School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, China
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 (creator_code:org_t)
Nature Research, 2023
2023
Engelska.
Ingår i: Nature Communications. - : Nature Research. - 2041-1723. ; 14:1
Relaterad länk:
https://doi.org/10.1...
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https://urn.kb.se/re...
https://doi.org/10.1...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • Materials that break multiple symmetries allow the formation of four-fermion condensates above the superconducting critical temperature (T c). Such states can be stabilized by phase fluctuations. Recently, a fermionic quadrupling condensate that breaks the Z 2 time-reversal symmetry was reported in Ba1−xKxFe2As2. A phase transition to the new state of matter should be accompanied by a specific heat anomaly at the critical temperature where Z 2 time-reversal symmetry is broken (TcZ2>Tc). Here, we report on detecting two anomalies in the specific heat of Ba1−xKxFe2As2 at zero magnetic field. The anomaly at the higher temperature is accompanied by the appearance of a spontaneous Nernst effect, indicating the breakdown of Z 2 symmetry. The second anomaly at the lower temperature coincides with the transition to a zero-resistance state, indicating the onset of superconductivity. Our data provide the first example of the appearance of a specific heat anomaly above the superconducting phase transition associated with the broken time-reversal symmetry due to the formation of the novel fermion order.

Ämnesord

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
NATURVETENSKAP  -- Fysik -- Subatomär fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Subatomic Physics (hsv//eng)

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