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  • Shipulin, IlyaInstitute for Metallic Materials, Leibniz-IFW Dresden, D-01069, Dresden, Germany; Institute for Solid State and Materials Physics, Technische Universität Dresden, D-01069, Dresden, Germany (författare)

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

  • Artikel/kapitelEngelska2023

Förlag, utgivningsår, omfång ...

  • Nature Research,2023
  • printrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:kth-339045
  • https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-339045URI
  • https://doi.org/10.1038/s41467-023-42459-0DOI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

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Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • QC 20231128
  • 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 och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Stegani, NadiaUniversity of Genoa, Via Dodecaneso 33, 16146, Genoa, Italy; Consiglio Nazionale delle Ricerche (CNR)-SPIN, Corso Perrone 24, 16152, Genova, Italy (författare)
  • Maccari, IlariaKTH,Kondenserade materiens teori,Laboratory for Theoretical and Computational Physics, Paul Scherrer Institute, 5232, Villigen PSI, Switzerlanderland(Swepub:kth)u1g4r4ts (författare)
  • Kihou, KunihiroNational Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, 305-8568, Japan (författare)
  • Lee, Chul HoNational Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, 305-8568, Japan (författare)
  • Hu, QuanxinTsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, 201210, China (författare)
  • Zheng, YuTsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, 201210, China (författare)
  • Yang, FazhiTsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, 201210, China (författare)
  • Li, YongweiTsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, 201210, China (författare)
  • Yim, Chi MingTsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, 201210, China; School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, China (författare)
  • Hühne, RubenInstitute for Metallic Materials, Leibniz-IFW Dresden, D-01069, Dresden, Germany (författare)
  • Klauss, Hans HenningInstitute for Solid State and Materials Physics, Technische Universität Dresden, D-01069, Dresden, Germany (författare)
  • Putti, MarinaUniversity of Genoa, Via Dodecaneso 33, 16146, Genoa, Italy; Consiglio Nazionale delle Ricerche (CNR)-SPIN, Corso Perrone 24, 16152, Genova, Italy (författare)
  • Caglieris, FedericoUniversity 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 (författare)
  • Babaev, EgorKTH,Kondenserade materiens teori(Swepub:kth)u1fe570h (författare)
  • Grinenko, VadimTsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, 201210, China; School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, China (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, GermanyUniversity of Genoa, Via Dodecaneso 33, 16146, Genoa, Italy; Consiglio Nazionale delle Ricerche (CNR)-SPIN, Corso Perrone 24, 16152, Genova, Italy (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Nature Communications: Nature Research14:12041-1723

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