• Editors' Suggestion

Quantum-well states in fractured crystals of the heavy-fermion material CeCoIn5

Nicolas Gauthier, Jonathan A. Sobota, Makoto Hashimoto, Heike Pfau, Dong-Hui Lu, Eric D. Bauer, Filip Ronning, Patrick S. Kirchmann, and Zhi-Xun Shen
Phys. Rev. B 102, 125111 – Published 8 September 2020

Abstract

Quantum-well states appear in metallic thin films due to the confinement of the wave function by the film interfaces. Using angle-resolved photoemission spectroscopy, we unexpectedly observe quantum-well states in fractured single crystals of CeCoIn5. We confirm that confinement occurs by showing that these states' binding energies are photon-energy independent and are well described with a phase accumulation model, commonly applied to quantum-well states in thin films. This indicates that atomically flat thin films can be formed by fracturing hard single crystals. For the two samples studied, our observations are explained by free-standing flakes with thicknesses of 206 and 101 Å. We extend our analysis to extract bulk properties of CeCoIn5. Specifically, we obtain the dispersion of a three-dimensional band near the zone center along in-plane and out-of-plane momenta. We establish part of its Fermi surface, which corresponds to a hole pocket centered at Γ. We also reveal a change of its dispersion with temperature, a signature that may be caused by the Kondo hybridization.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
1 More
  • Received 6 July 2020
  • Revised 18 August 2020
  • Accepted 19 August 2020

DOI:https://doi.org/10.1103/PhysRevB.102.125111

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Nicolas Gauthier1,2,*, Jonathan A. Sobota1, Makoto Hashimoto3, Heike Pfau1,4, Dong-Hui Lu3, Eric D. Bauer5, Filip Ronning6, Patrick S. Kirchmann1, and Zhi-Xun Shen1,2

  • 1Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
  • 2Geballe Laboratory for Advanced Materials, Departments of Applied Physics and Physics, Stanford University, Stanford, California 94305, USA
  • 3Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
  • 4Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 5MPA-CMMS, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 6Institute for Materials Science, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

  • *nicolas.gauthier@stanford.edu

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 102, Iss. 12 — 15 September 2020

Reuse & Permissions
Access Options

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×