Journal article
Vortex-core properties and vortex-lattice transformation in FeSe
Physical review. B, v 99(14), p144514
16 Apr 2019
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Abstract
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 similar to 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.
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Details
- Title
- Vortex-core properties and vortex-lattice transformation in FeSe
- Creators
- A. V. Putilov - Temple UniversityC. Di Giorgio - Temple UniversityV. L. Vadimov - Institute for Physics of MicrostructuresD. J. Trainer - Temple UniversityE. M. Lechner - Temple UniversityJ. L. Curtis - Drexel UniversityM. Abdel-Hafiez - Fayoum UniversityO. S. Volkova - National University of Science and Technology “MISiS”, Moscow 119049, RussiaA. N. Vasiliev - South Ural State UniversityD. A. Chareev - Institute of Experimental MineralogyG. Karapetrov - Drexel UniversityA. E. Koshelev - Argonne National LaboratoryA. Yu Aladyshkin - Temple UniversityA. S. Mel'nikov - RAS, Inst Phys Microstruct, GSP-105, Nizhnii Novgorod 603950, RussiaM. Iavarone - Temple University
- Publication Details
- Physical review. B, v 99(14), p144514
- Publisher
- Amer Physical Soc
- Number of pages
- 14
- Grant note
- 17-11-109 / Foundation for the Advancement of Theoretical Physics and Mathematics "BASIS" DE-SC0004556 / US Department of Energy, Office of Science, Basic Energy Science, Materials Sciences and Engineering Division; United States Department of Energy (DOE) MIUR (Ministry of Education, Universities and Research of the Italian Government); Ministry of Education, Universities and Research (MIUR) Russian Government Program of Competitive Growth of Kazan Federal University K2-2017-084 / Ministry of Education and Science of the Russian Federation; Ministry of Education and Science, Russian Federation US Civilian Research and Development Foundation (CRDF Global) 18-72-10027; 17-12-01383 / Russian Science Foundation; Russian Science Foundation (RSF) 02.A03.21.0004; 02.A03.21.0006; 02.A03.21.0011 / Act 211 of the Government of Russian Federation 17-52-12044 / Russian Foundation for Basic Research; Russian Foundation for Basic Research (RFBR)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000464720300005
- Scopus ID
- 2-s2.0-85065188840
- Other Identifier
- 991019168425004721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Physics, Applied
- Physics, Condensed Matter