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UID:DSC-22094
DTSTART;TZID=Europe/Berlin:20250630T110000
SEQUENCE:1751261983
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20250630T120000
URL:https://dresden-science-calendar.org/calendar/de/detail/22094
LOCATION:IFW\, Helmholtzstraße 2001069 Dresden
SUMMARY:Wen: Nickelate superconductivity: a new playground for unconvention
 al superconductors
CLASS:PUBLIC
DESCRIPTION:Speaker: Prof. Hai Wu Wen\nInstitute of Speaker: Nanjing Univer
 sity\, China \nTopics:\n\n Location:\n  Name: IFW (B3E.26\, IFW Dresden)\n
   Street: Helmholtzstraße 20\n  City: 01069 Dresden\n  Phone: \n  Fax: \n
 Description: The discovery of high-temperature superconductivity in nickel
 ate system has stimulated tremendous interest in the community [1\,2]. Amo
 ng the nickelate superconductors\, two typical systems have attracted the 
 most attention\, namely the infinite layer RE1-xSrxNiO2 with Tc reaching a
 bout 40 K\, and the bilayer system La3Ni2O7 with Tc above 90 K. In this ta
 lk I will report the progress in this rapidly developing field. Then I wil
 l report some progress in our group. We have synthesized bulk samples of t
 he infinite layer system bulk RE1-xSrxNiO2 (RE = Nd\, Sm) and found no sup
 erconductivity [3]. Detailed and careful TEM measurements unravel the puzz
 les why the bulk samples are not superconductive [4]. We have also carried
  out single particle tunneling measurement on the nickelate superconductin
 g thin film Nd1-xSrxNiO2\, a dominant V-shape spectrum (with a d-wave gap 
 around 4 meV) was discovered [5]\, which is mixed with a passive s-wave co
 mponent (~2meV). Combining with theoretical calculations\, we attribute th
 e dominant d-wave gap to the pairing potential of the orbital. Recently\, 
 we have also succeeded in growing the strained thin films of La2PrNi2O7 wi
 th Tconset = 41.5 K. Tunneling spectra are successfully measured on the te
 rraces after we removed the surface layer and expose the superconducting l
 ayer by using the tip-excavation technique. The spectrum shows a two-gap s
 tructure with delta1 ~ 19 meV\, delta2 ~ 6 meV\, and fittings based on the
  Dynes model indicate that the dominant gap should have an anisotropic s-w
 ave structure\, this allow us to put the priority in selecting the s+- amo
 ng the two arguable pairing models: s+- and d-wave in this thin films [6].
  Our results indicate the undoubted role played by the spin fluctuations i
 n establishing superconductivity in the two major nickelate superconductin
 g systems.     References: [1] Danfeng Li et al. Nature 527\, 624(2019)\, 
 [2] Hualei Sun et al. Nature 621\, 493-498 (2023)\, [3] Qing Li et al. Com
 mun. Mater. 1\, 16 (2020\, [4] Kejun Hu et al. Nat. Commun. 15\, 5104 (202
 4)\, [5] Qiangqiang Gu et al. Nat. Commun. 11\, 6027 (2020)\, [6] Shengtai
  Fan et al. arXiv. Condmat: arXiv:2506.01788.
DTSTAMP:20260410T042552Z
CREATED:20250626T053908Z
LAST-MODIFIED:20250630T053943Z
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