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Vortex-core properties and vortex-lattice transformation in FeSe

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dc.contributor.author Putilov A.
dc.contributor.author Di Giorgio C.
dc.contributor.author Vadimov V.
dc.contributor.author Trainer D.
dc.contributor.author Lechner E.
dc.contributor.author Curtis J.
dc.contributor.author Abdel-Hafiez M.
dc.contributor.author Volkova O.
dc.contributor.author Vasiliev A.
dc.contributor.author Chareev D.
dc.contributor.author Karapetrov G.
dc.contributor.author Koshelev A.
dc.contributor.author Aladyshkin A.
dc.contributor.author Mel'Nikov A.
dc.contributor.author Iavarone M.
dc.date.accessioned 2020-01-15T22:13:45Z
dc.date.available 2020-01-15T22:13:45Z
dc.date.issued 2019
dc.identifier.issn 2469-9950
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/157199
dc.description.abstract © 2019 American Physical Society. Low-temperature scanning tunneling microscopy and spectroscopy has been used to image the vortex core and the vortex lattice in FeSe single crystals. The local tunneling spectra acquired at the center of elliptical vortex cores display a strong particle-hole asymmetry with spatial oscillation, characteristic of the quantum-limit vortex core. Furthermore, a quasihexagonal vortex lattice at low magnetic field undergoes noticeable rhombic distortions above a certain field ∼1.5 T. This field H∗ also reveals itself as a kink in the magnetic field dependence of the specific heat. The observation of a nearly hexagonal vortex lattice at low field is very surprising for materials with an orthorhombic crystal structure and it is in apparent contradiction with the elliptical shape of the vortex cores. These observations can be directly connected to the multiband nature of superconductivity in this material, provided we attribute them to the suppression of superconducting order parameter in one of the energy bands. Above the field H∗ the superconducting coherence length for this band can well exceed the intervortex distance which strengthens the nonlocal effects. Therefore, in addition to multiple-band effects, other possible sources that can contribute to the observed evolution of the vortex-lattice structure include nonlocal effects which cause the field-dependent interplay between the symmetry of the crystal and vortex lattice or the magnetoelastic interactions due to the strain field generated by vortices.
dc.relation.ispartofseries Physical Review B
dc.title Vortex-core properties and vortex-lattice transformation in FeSe
dc.type Article
dc.relation.ispartofseries-issue 14
dc.relation.ispartofseries-volume 99
dc.collection Публикации сотрудников КФУ
dc.source.id SCOPUS24699950-2019-99-14-SID85065188840


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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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