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Title: Vortex creep at very low temperatures in single crystals of the extreme type-II Rh9In4S4

Journal Article · · Physical Review B
 [1];  [1];  [2];  [2];  [2];  [1];  [1]
  1. Autonomous University of Madrid (Spain). Laboratorio de Bajas Temperaturas y Altos Campos Magneticos, Unidad Asociada UAM, CSIC, Departamento de Fisica de la Materia Condensada, Instituto de Ciencia de Materiales Nicolas Cabrera and Condensed Matter Physics Center (IFIMAC)
  2. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Department of Physics & Astronomy

Here, we image vortex creep at very low temperatures using scanning tunneling microscopy in the superconductor Rh9In4S4 (Tc = 2.25 K). We measure the superconducting gap of Rh9In4S4, finding Δ ≈ 0.33 meV, and image a hexagonal vortex lattice up to close to Hc2 observing slow vortex creep at temperatures as low as 150 mK. We estimate thermal and quantum barriers for vortex motion and show that thermal fluctuations likely cause vortex creep, in spite of being at temperatures T/Tc < 0.1. We study creeping vortex lattices by making images during long times and show that the vortex lattice remains hexagonal during creep with vortices moving along one of the high-symmetry axes of the vortex lattice. Furthermore, the creep velocity changes with the scanning window suggesting that creep depends on the local arrangements of pinning centers. Vortices fluctuate on small-scale erratic paths, indicating that the vortex lattice makes jumps trying different arrangements during its travel along the main direction for creep. Lastly, the images provide a visual account of how vortex lattice motion maintains hexagonal order, while showing dynamic properties characteristic of a glass.

Research Organization:
Ames Lab., Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-07CH11358; 679080; 618321; MP-1201; FIS2014-54498-R; MDM-2014-0377
OSTI ID:
1374737
Alternate ID(s):
OSTI ID: 1350789
Report Number(s):
IS-J-9304; PRBMDO
Journal Information:
Physical Review B, Vol. 95, Issue 13; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

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Cited By (4)

Effect of dimensionality on the vortex dynamics in a type-II superconductor journal November 2019
Thermal creep induced by cooling a superconducting vortex lattice journal February 2020
Thermal creep induced by cooling a superconducting vortex lattice text January 2020
Effect of dimensionality on the vortex-dynamics in type-II superconductor text January 2020

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