Mode-mode coupling theory of itinerant electron antiferromagnetism in superconducting state

It has been considered since the first discovery of a high-Tc cuprate that an antiferromagnetic (AF) state and a superconducting (SC) state are separated in it. However, it is very intriguing that the coexistence of the AF and SC states has recently been observed in HgBa2Ca4Cu5O12+ (Hg-1245). Moreov...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2012-10, Vol.24 (40), p.405701-405701
Main Authors: Fujimoto, Yukinobu, Miyake, Kazumasa
Format: Article
Language:English
Subjects:
Antiferromagnetism
Computer Simulation
Condensed matter
Condensed matter: electronic structure, electrical, magnetic, and optical properties
COPPER OXIDE
Cuprates
Electric Conductivity
Emergence
Exact sciences and technology
Fluctuation
JOINING
Magnetic Fields
MAGNETIC PROPERTIES
Metals - chemistry
Models, Chemical
Order disorder
ORDER DISORDER RELATIONSHIPS
Physics
Properties of type I and type II superconductors
SUPERCONDUCTIVITY
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Summary:It has been considered since the first discovery of a high-Tc cuprate that an antiferromagnetic (AF) state and a superconducting (SC) state are separated in it. However, it is very intriguing that the coexistence of the AF and SC states has recently been observed in HgBa2Ca4Cu5O12+ (Hg-1245). Moreover, it is very novel that this coexistence of these two states appears if the SC-transition temperature Tc is higher than the AF-transition temperature TN. The mode-mode coupling theory can provide a clear elucidation of this novel phenomenon. A key point of this theory is that the AF susceptibility consists of the random-phase-approximation (RPA) term and the mode-mode coupling one. The RPA term works to make a positive contribution to the emergence of the antiferromagnetic critical point (AF-CP). In contrast, the mode-mode coupling term works to make a negative contribution to the emergence of the AF-CP. However, the growth of the SC-gap function in the dx2−y2-wave SC state works to suppress the negative contribution of the mode-mode coupling term to the emergence of the AF-CP. Moreover, the effect of SC fluctuations near the SC-transition temperature Tc suppresses the mode-mode coupling term of the AF susceptibility that works to hinder the AF ordering. For these two reasons, there is a possibility that the dx2−y2-wave SC state is likely to promote the emergence of the AF-CP. Namely, the appearance of the above-mentioned novel coexistence of the AF and SC states observed in Hg-1245 can be explained qualitatively on the basis of this idea.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/24/40/405701