Linked Life Data

21393700

Source:http://linkedlifedata.com/resource/pubmed/id/21393700

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
pubmed:issue
20
pubmed:dateCreated
2011-3-11
pubmed:abstractText
FeSe is employed as reference material to elucidate the observed high T(c) superconducting behaviour of the related layered iron pnictides. The structural and ensuing semimetallic band structural forms are here rather unusual, with the resulting ground state details extremely sensitive to the precise shape of the Fe-X coordination unit. The superconductivity is presented as coming from a combination of resonant valence bond and excitonic insulator physics, and incorporating boson-fermion degeneracy. Although sourced in a very different fashion, the latter leads to some similarities with the high temperature superconducting (HTSC) cuprates. The excitonic insulator behaviour sees spin density wave, charge density wave/periodic structural distortion, and superconductive instabilities all vie for ground state status. The conflict leads to a very sensitive and complex set of properties, frequently mirroring HTSC cuprate behaviour. The delicate balance between ground states is made particularly difficult to unravel by the micro-inhomogeneity of structural form which it can engender. It is pointed out that several other notable superconductors, layered in form, semimetallic with indirect overlap and possessing homopolar bonding, would look to fall into the same general category, ?-ZrNCl and MgB(2) and the high pressure forms of several elements, like sulfur, phosphorus, lithium and calcium, being cases in point.
pubmed:language
eng
pubmed:journal
pubmed:status
PubMed-not-MEDLINE
pubmed:month
May
pubmed:issn
1361-648X
pubmed:author
pubmed:issnType
Electronic
pubmed:day
26
pubmed:volume
22
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
203201
pubmed:year
2010
pubmed:articleTitle
A perspective on the Fe-based superconductors.
pubmed:affiliation
H H Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, UK. john.a.wilson@bris.ac.uk
pubmed:publicationType
Journal Article