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Hidden one-dimensional spin modulation in a three-dimensional metal.

Yejun Feng1, Jiyang Wang2, A Palmer2

  • 11] The Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA [2] The James Franck Institute and Department of Physics, University of Chicago, Chicago, Illinois 60637, USA.

Nature Communications
|June 19, 2014
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This summary is machine-generated.

High pressure transforms materials, but magnetism in gadolinium silicon (GdSi) remains robust. This stability is due to a persistent Fermi surface feature, revealing insights into magnetic order and topology.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Geophysics

Background:

  • Pressure profoundly alters material properties, inducing phase transitions and affecting magnetic states.
  • At 15 gigapascals (GPa), equivalent to depths of 500 km within Earth, silicon and germanium exhibit superconductivity.

Purpose of the Study:

  • To investigate the effect of extreme pressure on the magnetic properties of metallic gadolinium silicon (GdSi).
  • To understand the underlying mechanisms responsible for magnetic stability under high-pressure conditions.

Main Methods:

  • Utilized non-resonant X-ray magnetic diffraction within a diamond anvil cell to probe magnetic structure.
  • Performed band structure calculations to analyze electronic and Fermi surface properties under pressure.

Main Results:

  • Gadolinium silicon (GdSi) exhibits robust magnetism at 15 GPa, despite a significant volume reduction.
  • The stability of the incommensurate spin density wave is linked to a persistent, pressure-induced one-dimensional nesting of the Fermi surface.
  • A cooperative interaction between itinerant spins and local magnetic moments governs the modulated magnetic order.

Conclusions:

  • The topological properties of the Fermi surface play a crucial role in maintaining magnetic order under extreme pressure.
  • The findings offer insights into the interplay of topology, electronic structure, and magnetism in condensed matter systems.
  • This research highlights the potential functionality of materials exhibiting pressure-robust magnetic order.