Related Experiment Video
Updated: Feb 10, 2026
09:22
Ultrafast Lignin Extraction from Unusual Mediterranean Lignocellulosic Residues
Published on: March 9, 2021
7.6K
Unusual Magnetic Order in Eu11-x Hg54+x
Rachel Nixon1,2, Nazar Zaremba1, Samuel A Adegboyega3
1Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany.
ACS Organic & Inorganic Au
|February 9, 2026
Summary
This study investigates the Eu-Hg intermetallic system, revealing a fragile magnetic ground state with europium in mixed valence states. The material exhibits weak ferromagnetic coupling and orders at low temperatures, showing a delicate ferrimagnetic ground state.
Area of Science:
- Solid-state chemistry
- Materials science
- Magnetism
Background:
- Europium (Eu) valence can be mixed in solid-state compounds, particularly in structures with multiple Eu atom sites.
- Intermetallic compounds offer complex structures for studying fundamental magnetic properties.
Purpose of the Study:
- Investigate the magnetic properties of the Eu-based intermetallic noncentrosymmetric system Eu₁₁-ₓHg₅₄₊ₓ.
- Determine the valence state of europium and its influence on the magnetic ground state.
- Characterize the magnetic ordering and phase transitions in this system.
Main Methods:
- Synthesis and characterization of large single crystals of Eu₁₁-ₓHg₅₄₊ₓ.
- Detailed magnetic analysis using SQUID magnetometry.
- Crystallographic analysis to understand atomic positions.
Main Results:
- Evidence suggests europium exists in two valence states, leading to a fragile magnetic ground state.
- The cage-like structure results in weak ferromagnetic coupling between Eu atoms.
- Magnetic ordering occurs below T₁ = 5.5 K, with a spin reorientation at T₂ = 4.3 K, indicating no magnetic frustration.
- Magnetization pole reversal and a delicate ferrimagnetic ground state were observed.
- Additional magnetic phases are induced by external magnetic fields.
Conclusions:
- Eu₁₁-ₓHg₅₄₊ₓ exhibits a complex magnetic behavior attributed to mixed europium valency and its crystal structure.
- The system displays a fragile ferrimagnetic ground state with low-temperature magnetic ordering and field-induced phase transitions.
- Further research into Eu-based intermetallics can reveal novel magnetic phenomena.
Related Concept Videos
01:16Unusual Results
3.9K
Unusual results are those that have a very low chance of occurring. Unusual results can be identified using probabilities and the range rule of thumb. In problems involving probability, unusual results can be observed in 2 instances – an unusually high number of successes or an unusually low number of successes.
According to the range rule of thumb, any value above or below two standard deviations, 2σ from the mean, μ is considered unusual.
Maximum unusual value =...
According to the range rule of thumb, any value above or below two standard deviations, 2σ from the mean, μ is considered unusual.
Maximum unusual value =...
3.9K
01:07z Scores and Unusual Values
11.1K
The z score is one of the three measures of relative standing. It describes the location of a value in a dataset relative to the mean. z scores are obtained after the standardization of the values in a dataset. The z score for the mean is 0.
This score indicates how far a value is from the mean in terms of standard deviation. For example, if a data value has a z score of +1, the researcher can infer that the particular data value is one standard deviation above the mean. If another data...
This score indicates how far a value is from the mean in terms of standard deviation. For example, if a data value has a z score of +1, the researcher can infer that the particular data value is one standard deviation above the mean. If another data...
11.1K
03:02Colors and Magnetism
14.2K
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...
14.2K
01:30Magnetism
8.9K
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...
8.9K
01:18Magnetic Flux
4.8K
The magnetic flux measures the number of magnetic field lines passing through a given surface area. The SI unit for magnetic flux is the weber (Wb). Magnetic flux is a scalar quantity. It depends on three factors: the strength of the magnetic field B, the area through which the field lines pass, and the relative orientation of the field with the surface area.
Suppose a surface is divided into elements of area dA. For each element, the component of the magnetic field that is normal to the...
Suppose a surface is divided into elements of area dA. For each element, the component of the magnetic field that is normal to the...
4.8K
01:17Magnetic Damping
1.1K
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
1.1K