Charge-4e superconductivity from pair-density-wave order in certain high-temperature superconductors

Erez Berg, Eduardo Fradkin, Steven A. Kivelson

Research output: Contribution to journalArticle

Abstract

A number of spectacular experimental anomalies have been discovered recently in certain cuprates, notably La2-x Bax CuO 4and La1.6-xNd0.4Sr x CuO4, which show unidirectional spin and charge order (known as stripe order). We have recently proposed to interpret these bservations as evidence for a new striped superconducting state, in which the superconducting order parameter is modulated in space, such that its average is precisely zero. Here, we show that thermal melting of the striped superconducting state can lead to a number of unusual phases, of which the most novel is a charge-4e superconducting state, with a corresponding fractional flux quantum hc=4e. These are never-before-observed states of matter, which, moreover, cannot arise from the conventional Bardeen-Cooper-Schrieffer mechanism. Thus, direct confirmation of their existence, even in a small subset of the cuprates, could have much broader implications for our understanding of high-temperature uperconductivity. We propose experiments to observe fractional flux quantization, which could confirm the existence of thesestates.

Original languageEnglish (US)
Pages (from-to)830-833
Number of pages4
JournalNature Physics
Volume5
Issue number11
DOIs
StatePublished - Nov 2009

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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