ÖPG-CMD Joint Meeting 2026

Canceled: P001 - Superconducting density of states and vortex lattice of LaRu2P2 and superconducting gap of SrBi2Se4

Sep 21, 2026, 1:30 PM

1h

RESOWI B+F (University of Graz)

1) Poster M02 - Heavy quasiparticles in heavy fermion compounds Poster session

Speaker

Paula Obladen Agilera (Laboratorio de Bajas Temperaturas, Departamento de Física de la Materia Condensada, Instituto Nicolás Cabrera and Condensed Matter Physics Center (IFIMAC), Unidad Asociada UAM-CSIC, Universidad Autónoma de Madrid, Madrid, Spain)

Description

We provide the superconducting density of states of the pnictide superconductor LaRu$_2$P$_2$, measured using millikelvin scanning tunnelling microscopy. From the tunnelling conductance, we extract a density of states which shows the opening of a s-wave single superconducting gap. The temperature dependence of the gap also follows BCS theory. Under magnetic fields, vortices present Caroli de Gennes Matricon states, although these are strongly broadened by defect scattering. SrBi₂Se₄ can be viewed as a structurally and electronically derived system from Bi$_2$Se$_3$, where the fundamental Bi–Se building blocks found in the layered topological insulator Bi$_2$Se$_3$ are reconfigured into a quasi‑one‑dimensional framework, leading to anisotropic properties and potentially modified topological behaviour compared to the parent 3D compound. Contrary to Bi$_2$Se$_3$, SrBi$_2$Se$_4$ is superconducting and could host correlations, due to its low-dimensional structure, and potential topological properties. Here we present first measurements of the superconducting gap of SrBi₂Se₄ as a function of temperature.

[1] Marta Fernández-Lomana et al 2025 J. Phys.: Condens. Matter 37 025604