Related Experiment Video
Updated: May 31, 2026
Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene
Published on: July 3, 2015
Valence and magnetic ordering in intermediate valence compounds: TmSe versus SmB(6)
1Département de Recherche Fondamentale sur la Matière Condensée, CEA Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France.
Intermediate valence systems like Thulium Selenide (TmSe) and Samarium Hexaboride (SmB6) show pressure-induced magnetic transitions. Increasing pressure enhances Neel temperature (TN) in metallic phases, linked to 4f electron renormalization.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Magnetism
Background:
- Intermediate valence compounds exhibit unique electronic and magnetic properties due to delocalized f-electrons.
- Thulium Selenide (TmSe) and Samarium Hexaboride (SmB6) are model systems for studying pressure effects on valence and magnetism.
Purpose of the Study:
- To investigate the pressure-induced magnetic phase transitions in TmSe and SmB6 using low-temperature ac microcalorimetry.
- To understand the relationship between electronic structure, valence state, and magnetic ordering under high pressure.
Main Methods:
- In situ high-pressure (up to 18 GPa) ac microcalorimetry at low temperatures.
- Tuning pressure to observe transitions in magnetic and electronic properties.
Main Results:
- Confirmed pressure-induced antiferromagnetic insulator-to-metal transition in TmSe around 3 GPa.
- Observed a linear increase in Neel temperature (TN) with pressure in the metallic phase of TmSe and TmS.
- Detected long-range magnetism in SmB6 above 8 GPa, with a homogeneous magnetic phase emerging above 10 GPa, near its insulator-to-metal transition.
Conclusions:
- Pressure significantly influences the magnetic and electronic properties of intermediate valence systems.
- The observed phenomena are attributed to the renormalization of 4f wavefunctions and changes in valence configuration.
- Findings provide insights into the behavior of heavy fermion compounds and the emergence of magnetism under pressure.
More Related Videos
06:53Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
09:06Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
Related Concept Videos
02:42Valence Bond Theory
03:02Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
04:01VSEPR Theory and the Effect of Lone Pairs
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
02:27Predicting Molecular Geometry
03:24Hybridization of Atomic Orbitals I