Publication: Superconductivity of underdoped PrFeAs(O,F) investigated via point-contact spectroscopy and nuclear magnetic resonance
Дата
2020
Авторы
Daghero, D.
Piatti, E.
Zhigadlo, N. D.
Ummarino, G. A.
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Аннотация
Underdoped PrFeAs(O,F), one of the lesser known members of the 1111 family of iron-based superconductors, was investigated in detail by means of transport, magnetometry, nuclear magnetic resonance (NMR) measurements, and point-contact Andreev-reflection spectroscopy (PCARS). PCARS measurements on single crystals evidence the multigap nature of PrFeAs(O,F) superconductivity, shown to host at least two isotropic gaps, clearly discernible in the spectra, irrespective of the direction of current injection (i.e., along the ab planes or along the c axis). Additional features at higher energy can be interpreted as signatures of a strong electron-boson coupling, as demonstrated by a model which combines Andreev reflection with the Eliashberg theory. Magnetic resonance measurements in the normal phase indicate the lack of a magnetic order in underdoped PrFeAs(O,F), while As-75 NMR spin-lattice relaxation results suggest the presence of significant electronic spin fluctuations, peaking above T-c and expected to mediate the superconducting pairing.
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Superconductivity of underdoped PrFeAs(O,F) investigated via point-contact spectroscopy and nuclear magnetic resonance / Daghero, D [et al.] // Physical Review B. - 2020. - 102. - № 10. - 10.1103/PhysRevB.102.104513
URI
https://www.doi.org/10.1103/PhysRevB.102.104513
https://www.scopus.com/record/display.uri?eid=2-s2.0-85094155447&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000573182300009
https://openrepository.mephi.ru/handle/123456789/22444
https://www.scopus.com/record/display.uri?eid=2-s2.0-85094155447&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000573182300009
https://openrepository.mephi.ru/handle/123456789/22444