Bismuth kagome sublattice distortions by quenching and flux pinning in superconducting RbBi2

Document Type

Article

Publication Date

9-1-2021

Abstract

The properties of RbBi2, a 4.15 K superconductor, were investigated using magnetic field, pressure, and neutron diffraction. Under hydrostatic pressure, an almost 50% reduction of Tc is observed, linked to a low Debye temperature estimated at 165 K. The resistivity and magnetic susceptibility were measured on quenched and slow-cooled polycrystalline samples. The resistivity follows a low temperature power-law dependence in both types of samples, while the diamagnetic susceptibility, χ, is dependent on the sample cooling history. Slow-cooled samples have χ=-1 while quenched samples have χ<-1 due to grain size differences. Evidence of the effects of the cooling rate is also discerned from the local structure, obtained by neutron diffraction and the pair density function analysis. Slow-cooled samples have structurally symmetric Bi hexagons, in contrast to quenched samples in which disorder is manifested in periodic distortions of the Bi hexagonal rings of the kagome sublattice. Disorder may lead to flux pinning that reduces vortex mobility, but Tc remains unaffected by the cooling rate.

Identifier

85114857710 (Scopus)

Publication Title

Physical Review B

External Full Text Location

https://doi.org/10.1103/PhysRevB.104.104503

e-ISSN

24699969

ISSN

24699950

Issue

10

Volume

104

Grant

DE-FG02-01ER45927

Fund Ref

U.S. Department of Energy

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