Related Experiment Video
Updated: Jun 27, 2025
06:53
Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
2.0K
Exotic Magnetism in Perovskite KOsO_{3}.
Jie Chen1, Hongze Li1, Javier Gainza2
1Materials Science and Engineering program, Mechanical Engineering, University of Texas at Austin, Austin, Texas 78712 USA.
Physical Review Letters
|April 29, 2024
Summary
A new osmium-based perovskite, KOsO3, exhibits unique electronic and magnetic properties. This material shows exotic magnetic ordering and phase transitions, offering insights into electron behavior.
Area of Science:
- Solid State Chemistry
- Condensed Matter Physics
- Materials Science
Background:
- Perovskite materials are known for diverse electronic and magnetic properties.
- Understanding complex electron interactions in transition metal oxides is crucial for novel material discovery.
Purpose of the Study:
- To synthesize and characterize a new perovskite, KOsO3.
- To investigate its structural, magnetic, and electronic properties under varying conditions.
- To explore the crossover from localized to itinerant electronic behavior.
Main Methods:
- High-pressure and high-temperature synthesis.
- Synchrotron X-ray powder diffraction (SXRD) for structural analysis.
- Neutron powder diffraction for magnetic ordering.
- Magnetic and transport property measurements.
- Differential scanning calorimetry and specific heat measurements.
Main Results:
- Stabilization of a new perovskite, KOsO3, under extreme conditions.
- Identification of cubic, tetragonal, and rhombohedral phases with transition temperatures at 500 K, 320 K, and 230 K.
- Observation of an exotic magnetic ordering phase.
- Comprehensive data on physical properties indicating a crossover in electronic behavior.
Conclusions:
- KOsO3 is a novel perovskite with complex phase transitions and exotic magnetic ordering.
- The material's electronic structure facilitates exploration of Mott and Hund's rule couplings.
- KOsO3 serves as a model system for studying the interplay of localized and itinerant electrons.
Related Concept Videos
03:02Colors and Magnetism
11.6K
Color in Coordination Complexes
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...
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...
11.6K
01:31Ferromagnetism
2.4K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.4K
01:30Magnetism
6.3K
Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
6.3K
01:30Paramagnetism
2.5K
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
2.5K
01:24Potential Due to a Magnetized Object
282
Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
The vector...
282
01:31Magnetic Susceptibility and Permeability
1.1K
In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
1.1K