Linked Life Data

16094364

Source:http://linkedlifedata.com/resource/pubmed/id/16094364

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
7052
pubmed:dateCreated
2005-8-11
pubmed:abstractText
The mechanism of high-transition-temperature (high-T(c)) superconductivity in doped copper oxides is an enduring problem. Antiferromagnetism is established as the competing order, but the relationship between the two states in the intervening 'pseudogap' regime has become a central puzzle. The role of the crystal lattice, which is important in conventional superconductors, also remains unclear. Here we report an anomalous increase of the distance between copper oxide planes on cooling, which results in negative thermal volume expansion, for layered ruthenium copper oxides that have been doped to the boundary of antiferromagnetism and superconductivity. We propose that a crossover between these states is driven by spin ordering in the ruthenium oxide layers, revealing a novel mechanism for negative lattice expansion in solids. The differences in volume and lattice strain between the distinct superconducting and antiferromagnetic states can account for the phase segregation phenomena found extensively in low-doped copper oxides, and show that Cooper pair formation is coupled to the lattice. Unusually large variations of resistivity with magnetic field are found in these ruthenium copper oxides at low temperatures through coupling between the ordered Ru and Cu spins.
pubmed:commentsCorrections
pubmed:language
eng
pubmed:journal
pubmed:status
PubMed-not-MEDLINE
pubmed:month
Aug
pubmed:issn
1476-4687
pubmed:author
pubmed:issnType
Electronic
pubmed:day
11
pubmed:volume
436
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
829-32
pubmed:dateRevised
2005-10-27
pubmed:year
2005
pubmed:articleTitle
Negative lattice expansion from the superconductivity--antiferromagnetism crossover in ruthenium copper oxides.
pubmed:affiliation
Department of Chemistry, University of Aberdeen, Meston Walk, Aberdeen AB24 3UE, UK.
pubmed:publicationType
Journal Article, Retracted Publication