Disorder in the ranks

Article Abstract:

The transition temperature in a high temperature superconductor can be markedly changed by changing the dopant. Attfield and colleagues show that this happens due to lattice strains caused by cation size disorder. They show that the degree of lattice-size disorder in the LaO layer has a major effect on Tc. Lattices with minimal size disorder had the highest Tc, and those with bigger or smaller dopant ions had lower Tc.

Observations, Superconductivity

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Superconductivity of boro-nitrides

Article Abstract:

A new high-temperature intermetallic superconductor has been discovered, La3Ni2B2N3, a subclass of LuNi2B2C. Its electronic structure is likely to have two-dimensional behavior but the first reported crystal structure contained significant errors. The first report used electron diffraction and failed to account for dynamical diffraction effects. However, that data has been revised.

Intermetallic compounds

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How 'spin ice' freezes

Article Abstract:

Research on freezing and thermodynamics involving ice is examined in detail. The focus is on spin freezing transition with relaxation times in a narrow range.

Ice, Thermodynamics

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