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R Joynt

Publications and source records attributed to R Joynt.

At least 19 recordsLinked to original sources
PubMed2000

Theory of the transition at 0.2 K in Ni-doped Bi2Sr2CaCu2O8

A theory is put forward that the electronic phase transition at 0.2 K in Ni-doped Bi2Sr2CaCu2O8 is a result of the formation of a spin density wave in the system of Ni impurities. The driving force for the transition is the exchange interaction between the impurity spins and the spins of the conduction electrons. This creates a small gap at two of the four nodes of the superconducting gap. The effect is to reduce the thermal conductivity by a factor of 2, as observed.

Journal Article↗
PubMed1999

Pseudogaps and extrinsic losses in photoemission experiments on poorly conducting solids

A photoelectron emitted from a conducting solid may suffer a substantial energy change through ohmic losses that can drastically alter the line shape on the millielectron volt scale that is now observable through improved resolution. Almost all of this energy loss occurs after the electron leaves the solid. These losses are expected to be important in isotropic materials with relatively low conductivity, such as certain colossal magnetoresistance manganates, and in very electrically anisotropic materials, such as one-dimensional conductors, and may also affect interpretation of photoemission in superconductors with high transition temperatures. The electric field of the photoelectron can penetrate the solid, and extrinsic losses of this type can mimic pseudogap effects and other peculiar features of photoemission in cubic manganates, as illustrated for La0.67Ca0.33MnO3.

Journal Article↗
PubMed1991

Phases of URu2Si2.

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Journal Article↗