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Wydarzenia



Seminarium Oddziału Badań Magnetyków

13:30 Wednesday, 17-11-21
Microsoft Teams

Superconductivity enhanced by atomic disorder

prof. dr hab. Andrzej Ślebarski

Oddział Badań Magnetyków, INTiBS PAN

Seminarium odbędzie się zdalnie w aplikacji Microsoft Teams. W celu wzięcia udziału w wydarzeniu należy dołączyć do zespołu Seminarium OBM.Można do niego dołączyć na stałe przy użyciu kodu dostępu ol7omod (dotyczy to osób posiadających konto w domenie intibs.pl, pozostałe osoby proszę o kontakt z prof. dr. hab. Piotrem Wiśniewskim ()).

Streszczenie:

We investigated the effect of enhancement of superconducting transition temperature Tc by nonmagnetic atom disorder in the series of filled skutterudite-related compounds (La3M4Sn13, Ca3Rh4Sn13, Y5Rh6Sn18, Lu5Rh6Sn18; M= Co, Ru, Rh), where the atomic disorder is generated by various defects or doping. We have shown that the disorder on the coherence length scale ξ in these nonmagnetic quasi‑skutterudite superconductors additionally generates a non-homogeneous, “high‑temperature” superconducting phase with Tc* > Tc (dilute disorder scenario), while the strong fluctuations of stoichiometry due to increasing doping can rapidly increase the superconducting transition temperature of the sample even to the value of Tc* ~ Tc (dense disorder leading to strong inhomogeneity). This phenomenon seems to be characteristic of high-temperature superconductors superconducting SCESs and superconducting heavy fermions, and recently have received renewed attention. We documented experimentally the stronger lattice stiffening of the inhomogeneous superconducting phase Tc* in respect to the bulk Tc one and propose a phenomenological model that explains the Tc* > Tc behavior in the series of nonmagnetic skutterudite-related compounds.

INSTYTUT NISKICH TEMPERATUR
I BADAŃ STRUKTURALNYCH
im. Włodzimierza Trzebiatowskiego
POLSKIEJ AKADEMII NAUK
Adres Instytutu:
ul. Okólna 2, 50-422 Wrocław
Adres elektroniczny:
71 343 5021, 71 395 4xxx (xxx nr wew.)
Fax: 71 344 1029
Poniedziałek - piątek w godz. 7:30-15:30