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Related Concept Videos

Superconductor01:24

Superconductor

A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
Types Of Superconductors01:28

Types Of Superconductors

A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
Ferromagnetism01:31

Ferromagnetism

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...
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
Paramagnetism01:30

Paramagnetism

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...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...

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Related Experiment Video

Updated: May 13, 2026

High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions
08:42

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Superconductivity with extremely large upper critical fields in Nb2Pd0.81S5.

Q Zhang1, G Li, D Rhodes

  • 1National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA.

Scientific Reports
|March 15, 2013
PubMed
Summary
This summary is machine-generated.

We discovered a new superconductor, Nb2Pd0.81S5, exhibiting high critical fields despite a low transition temperature. Its properties suggest it may be an unconventional multi-band superconductor.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid State Chemistry

Background:

  • Superconductivity in transition metal-chalcogenides is an active research area.
  • Understanding the mechanisms behind high-field superconductivity is crucial for technological applications.

Purpose of the Study:

  • To report the discovery of superconductivity in a novel compound, Nb2Pd0.81S5.
  • To investigate the superconducting properties, including critical fields and anisotropy.
  • To explore the underlying electronic structure and potential for unconventional superconductivity.

Main Methods:

  • Synthesis and characterization of the Nb2Pd0.81S5 compound.
  • Measurements of superconducting transition temperature (Tc) and upper critical fields (μ0Hc2).
  • Band structure calculations and static spin susceptibility analysis using random phase approximation.

Main Results:

  • Superconductivity observed in Nb2Pd0.81S5 with Tc ≈ 6.6 K.
  • Remarkably high and anisotropic upper critical fields, exceeding 37 T along the b-axis.
  • Evidence for multi-band superconductivity, supported by linear temperature dependence of μ0Hc2 and anisotropic behavior.
  • Band structure calculations reveal cylindrical and quasi-1D Fermi surface sheets.
  • Spin susceptibility indicates proximity to a magnetic state, suggesting unconventional superconductivity.

Conclusions:

  • Nb2Pd0.81S5 is a novel multi-band superconductor with significant potential.
  • The observed properties suggest a possible link between magnetism and superconductivity, pointing towards unconventional pairing mechanisms.
  • Further research is warranted to fully elucidate the nature of superconductivity in this material.