Superfluid states with finite momentum of Cooper pairs in nuclear matter

Superfluid states with finite momentum of Cooper pairs in nuclear matter

Superfluid states of symmetric nuclear matter with finite total momentum of Cooper pairs (nuclear LOFF phase) are studied with the use of Fermi–liquid theory in the model with Skyrme effective forces. It is considered the case of four–fold splitting of the excitation spectrum due to finite superfluid mom...

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Published in:Вопросы атомной науки и техники
Date:2001
Main Author: Isayev, A.A.
Format: Article
Language:English
Published: Національний науковий центр «Харківський фізико-технічний інститут» НАН України 2001
Subjects:
Quantum fluids
Online Access:https://nasplib.isofts.kiev.ua/handle/123456789/80056
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Journal Title:Digital Library of Periodicals of National Academy of Sciences of Ukraine
Cite this:Superfluid states with finite momentum of Cooper pairs in nuclear matter / A.A. Isayev // Вопросы атомной науки и техники. — 2001. — № 6. — С. 370-374. — Бібліогр.: 14 назв. — англ.

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Digital Library of Periodicals of National Academy of Sciences of Ukraine
id nasplib_isofts_kiev_ua-123456789-80056
record_format dspace
spelling Isayev, A.A.
2015-04-09T16:53:12Z
2015-04-09T16:53:12Z
2001
Superfluid states with finite momentum of Cooper pairs in nuclear matter / A.A. Isayev // Вопросы атомной науки и техники. — 2001. — № 6. — С. 370-374. — Бібліогр.: 14 назв. — англ.
1562-6016
PACS numbers: 21.65.+f; 21.30.Fe; 71.10.Ay
https://nasplib.isofts.kiev.ua/handle/123456789/80056
Superfluid states of symmetric nuclear matter with finite total momentum of Cooper pairs (nuclear LOFF phase) are studied with the use of Fermi–liquid theory in the model with Skyrme effective forces. It is considered the case of four–fold splitting of the excitation spectrum due to finite superfluid momentum and coupling of T = 0 and T = 1 pairing channels. It has been shown that at zero temperature the energy gap in triplet–singlet (TS) pairing channel (in spin and isospin spaces) for the SkM∗ force demonstrates double–valued behavior as a function of superfluid momentum. As a consequence, the phase transition at the critical superfluid momentum from the LOFF phase to the normal state will be of a first order. Behavior of the energy gap as a function of density for TS pairing channel under increase of superfluid momentum changes from one–valued to universal two–valued. It is shown that two–gap solutions, describing superposition of states with singlet–triplet (ST) and TS pairing of nucleons appear as a result of branching from one–gap ST solution. Comparison of the free energies shows that the state with TS pairing of nucleons is thermodynamically most preferable.
The author is grateful for discussions a nd useful comments to S. Peletminsky, G. Roepke, H.-J. Schulze and A. Yatsenko. The financial support of STCU (grant No. 1480) is acknowledged.
en
Національний науковий центр «Харківський фізико-технічний інститут» НАН України
Вопросы атомной науки и техники
Quantum fluids
Superfluid states with finite momentum of Cooper pairs in nuclear matter
Сверхтекучие состояния с конечным импульсом куперовских пар в ядерной материи
Article
published earlier
institution Digital Library of Periodicals of National Academy of Sciences of Ukraine
collection DSpace DC
title Superfluid states with finite momentum of Cooper pairs in nuclear matter
spellingShingle Superfluid states with finite momentum of Cooper pairs in nuclear matter
Isayev, A.A.
Quantum fluids
title_short Superfluid states with finite momentum of Cooper pairs in nuclear matter
title_full Superfluid states with finite momentum of Cooper pairs in nuclear matter
title_fullStr Superfluid states with finite momentum of Cooper pairs in nuclear matter
title_full_unstemmed Superfluid states with finite momentum of Cooper pairs in nuclear matter
title_sort superfluid states with finite momentum of cooper pairs in nuclear matter
author Isayev, A.A.
author_facet Isayev, A.A.
topic Quantum fluids
topic_facet Quantum fluids
publishDate 2001
language English
container_title Вопросы атомной науки и техники
publisher Національний науковий центр «Харківський фізико-технічний інститут» НАН України
format Article
title_alt Сверхтекучие состояния с конечным импульсом куперовских пар в ядерной материи
description Superfluid states of symmetric nuclear matter with finite total momentum of Cooper pairs (nuclear LOFF phase) are studied with the use of Fermi–liquid theory in the model with Skyrme effective forces. It is considered the case of four–fold splitting of the excitation spectrum due to finite superfluid momentum and coupling of T = 0 and T = 1 pairing channels. It has been shown that at zero temperature the energy gap in triplet–singlet (TS) pairing channel (in spin and isospin spaces) for the SkM∗ force demonstrates double–valued behavior as a function of superfluid momentum. As a consequence, the phase transition at the critical superfluid momentum from the LOFF phase to the normal state will be of a first order. Behavior of the energy gap as a function of density for TS pairing channel under increase of superfluid momentum changes from one–valued to universal two–valued. It is shown that two–gap solutions, describing superposition of states with singlet–triplet (ST) and TS pairing of nucleons appear as a result of branching from one–gap ST solution. Comparison of the free energies shows that the state with TS pairing of nucleons is thermodynamically most preferable.
issn 1562-6016
url https://nasplib.isofts.kiev.ua/handle/123456789/80056
citation_txt Superfluid states with finite momentum of Cooper pairs in nuclear matter / A.A. Isayev // Вопросы атомной науки и техники. — 2001. — № 6. — С. 370-374. — Бібліогр.: 14 назв. — англ.
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first_indexed 2025-12-07T20:43:52Z
last_indexed 2025-12-07T20:43:52Z
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