We have developed a very sensitive, highly selective, non-destructive technique for screening inhomogeneous materials for the presence of superconductivity. This technique, based on phase sensitive detection of microwave absorption is capable of detecting 10(-12) cc of a superconductor embedded in a non-superconducting, non-magnetic matrix. For the first time, we apply this technique to the sea...

High-entropy alloys are made from random mixtures of principal elements on simple lattices, stabilized by a high mixing entropy. The recently discovered body-centered cubic (BCC) Ta-Nb-Hf-Zr-Ti high-entropy alloy superconductor appears to display properties of both simple crystalline intermetallics and amorphous materials; e.g., it has a well-defined superconducting transition along with an exc...

A superconducting critical temperature above 200 K has recently been discovered in H2S (or D2S) under high hydrostatic pressure1, 2. These measurements were interpreted in terms of a decomposition of these materials into elemental sulfur and a hydrogen-rich hydride that is responsible for the superconductivity, although direct experimental evidence for this mechanism has so far been lacking. He...

Superconductivity, which is a quantum state induced by spontaneous gauge symmetry breaking, frequently emerges in low-dimensional materials. Hence, low dimensionality has long been considered as necessary to achieve high superconducting transition temperatures (TC). The recently discovered post-perovskite (ppv) MgSiO3, which constitutes the Earth's lowermost mantle (D" layer), has attracted sig...

– We study the quantum transition from an antiferromagnet to a superconductor in a model for electronand hole-doped cuprates by means of a variational cluster perturbation theory approach. In both cases, our results suggest a tendency towards phase separation between a mixed antiferromagnetic-superconducting phase at low doping and a pure superconducting phase at larger doping. However, in the ...

If phase coherence determines the superconducting transition temperature T c in the cuprate oxides, it is of great interest to understand the role that dynamics of the phase fluctuation plays in bringing about depletion of the superconducting condensate. We will show that a phase correlation function can be calculated that allows us to describe depletion of superconducting condensate as a resul...

4 Superconductivity and stripes in the t J model 73 4. D An important property of the projected BCS wavefunction 119 Bibliography 123 Introduction 1 Introduction The fascinating subject of superconductivity was opened over a century ago by Onnes [1], but until quite recently it was strictly a low-temperature phenomenon. The discovery of the cuprate superconductors [2] in a family of transition ...

In this paper we describe a methodology for the search for new superconducting materials. This consists of a parallel synthesis of a highly inhomogeneous alloy which covers large areas of the metallurgical phase diagram combined with a fast, microwave-based method which allows non-superconducting portions of the sample to be discarded. Once an inhomogeneous sample containing a minority phase su...

Synthesis and electrochemical performance of doped LiCoO2 materials S.A. Needham a,∗, G.X. Wang a,b, H.K. Liu a,b, V.A. Drozd c, R.S. Liu c a Institute for Superconducting & Electronic Materials, University of Wollongong, Northfields Avenue, Gwynneville, NSW 2522, Australia b Australian Research Council Centre of Excellence for Nanostructured Electromaterials, University of Wollongong, Australi...

The authors have noticed that in the original version of this Article, there are several typographic errors. On three occasions in the Results section and four occasions in the Discussion, the compound Nb2Pd0.81S5 is mistakenly referred to as Nb2Pd0.81Se5. SUBJECT AREAS: SUPERCONDUCTING PROPERTIES AND MATERIALS ELECTRONIC PROPERTIES AND MATERIALS ELECTRONIC STRUCTURE ELECTRICAL AND ELECTRONIC E...