Connecting two classes of unconventional superconductors

Schematic temperature-pressure phase diagram of CeFeAsO. © MPI CPfS

The understanding of unconventional superconductivity is one of the most challenging and fascinating tasks of solid-state physics. Different classes of unconventional superconductors share that superconductivity emerges near a magnetic phase despite the underlying physics is different. Two of these unconventional materials are the heavy-fermion and the iron-based superconductors.

Researcher from the Max Planck Institute for Chemical Physics of Solids applied large hydrostatic pressures to tiny single crystals of CeFeAsO, a non-superconducting parent compound to iron-based superconductors, using diamond anvil pressure cells.

By electrical, magnetic and structural measurements they showed that upon increasing the applied pressure, the material characteristics change from that of an iron-pnictide material to that of a heavy-fermion metal. Surprisingly, a narrow superconducting phase emerges in the boundary region between the typical iron-pnictide spin-density-wave magnetism and a Ce-based Kondo-regime.

This suggests that the two major phenomena characterizing iron-pnictides and heavy-fermions, spin-density-wave magnetism and the Kondo-effect, work together to produce superconductivity in CeFeAsO.

This work is published in Physical Review Letters and has been selected by the editors to be a PRL Editors’ Suggestion. Only about one Letter in six is chosen for this highlighting.

Wissenschaftliche Ansprechpartner:

Michael.Nicklas@cpfs.mpg.de

Originalpublikation:

K. Mydeen, A. Jesche , K. Meier-Kirchner, U. Schwarz, C. Geibel , H. Rosner, and M. Nicklas. Electron Doping of the Iron-Arsenide Superconductor CeFeAsO Controlled by Hydrostatic Pressure. Phys. Rev. Lett. 125, 207001 (2020),
DOI: 10.1103/PhysRevLett.125.207001

https://www.cpfs.mpg.de/3256761/20201111b

https://www.cpfs.mpg.de/de

Media Contact

Dipl.-Übers. Ingrid Rothe Presse- und Öffentlichkeitsarbeit
Max-Planck-Institut für Chemische Physik fester Stoffe

All latest news from the category: Physics and Astronomy

This area deals with the fundamental laws and building blocks of nature and how they interact, the properties and the behavior of matter, and research into space and time and their structures.

innovations-report provides in-depth reports and articles on subjects such as astrophysics, laser technologies, nuclear, quantum, particle and solid-state physics, nanotechnologies, planetary research and findings (Mars, Venus) and developments related to the Hubble Telescope.

Back to home

Comments (0)

Write a comment

Newest articles

Hungry or full: It comes down to the atomic details

Insight into the molecular structure of an appetite-regulating cell receptor A protein – measuring just a few nanometers in size – acts as a molecular switch with a crucial role…

Artificial opals measure temperature and time

Researchers in Bayreuth discover novel sensors. Due to their iridescent colors, opals have been considered particularly precious gemstones since antiquity. The way these stones shimmer is caused by their nanostructures….

Ultrathin electronic barrier layer to control interface luminescence

In a new publication from Opto-Electronic Advances; DOI 10.29026/oea.2021.200064, Researchers led by Professor Xu Chunxiang, Southeast University, Nanjing, China discuss nano-buffer controlled electron tunneling to regulate heterojunctional interface emission. Light emitting…

Partners & Sponsors