Archive: 2021 - Moldavian Journal of the Physical Sciences

30 Dec 2021

2021
V. 20
2
(p.129 - 135)

Various manifestations of weak magnetism and superconductivity in inclination interfaces of Bi, Sb and Bi1-xSbx

CZU: 538.945+537.622+546.86/.87

DOI: https://doi.org/10.53081/mjps.2021.20-2.03

Authors:

Muntyanu Fiodor M.; Nenkov Konstantin A.; Zaleski Andrzej Janusz; Condrea Elena; Chistol Vitalie

Summary:

The magnetic properties of the nano-width bicrystal interfaces (CIs) of Bi, Sb and 3D topological insulator Bi1xSbx (0.06 ≤ x ≤ 0.2) are studied in a temperature range of 1.6–300 K. These materials do not show superconductivity under normal rhombohedral conditions and are anomalous diamagnetics. At the same time, two superconducting phases with Tc ≤ 21 K and magnetic hysteresis loops against a diamagnetic background typical for strong type II superconductors are identified in Bi interfaces. At the CIs of Bi1xSbx (0.06 ≤ x ≤ 0.2), as well as Sb, a superconducting transition and a ferromagnetic hysteresis loop or a dual loop (superimposed ferromagnetic and superconducting loops) against a paramagnetic background are observed; they indicate the simultaneous occurrence of superconductivity and weak ferromagnetism, which is specific to 3D topological insulators. The revealed coexistence of superconductivity and weak magnetism at these CIs is of significant interest for the fundamental physics and future applications in quantum computing and spintronic devices.

Proprietățile magnetice ale interfețelor bicristaline (CIs) de nano-lățime din Bi, Sb și 3D izolator topologic Bi1-xSbx (0,06≤x≤0,2) au fost studiate în intervalul de temperatură 1.6-300K. Aceste materiale nu prezintă supraconductibilitate în condiții romboedrice normale și sunt diamagnetici anormali. În același timp, două faze supraconductoare cu Tc ≤21K și bucle de istereză magnetică pe un fundal diamagnetic tipic pentru superconductorii puternici de tip II au fost identificate în interfețele Bi. În CIs ale Bi1-xSbx (0,06≤x≤0,2), precum și ale Sb s-au observat tranziții supraconductoare și bucle de istereză feromagnetică sau bucle duale (bucle feromagnetice și de tip supraconductor suprapuse) pe un fundal paramagnetic, indicând prezenţa simultană a supraconductivității și feromagnetismului slab, specificâ izolatorilor topologici 3D. Coexistența supraconductivității și a magnetismului slab in aceste CIs manifestă un interes sporit pentru fizica fundamentală și aplicațiile viitoare în computing cuantic și dispozitive spintronice.

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<meta name="citation_author" content="Muntyanu Fiodor M.">
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<meta name="citation_author" content="Chistol Vitalie">
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<dc:subject>izolator topologic 3D</dc:subject>
<dc:title><p> Various manifestations of weak magnetism and superconductivity in inclination interfaces of Bi, Sb and Bi1-xSbx</p></dc:title>
<dc:type>info:eu-repo/semantics/article</dc:type>
</oai_dc:dc>

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SM ISO690:2012

MUNTYANU, Fiodor M.; NENKOV , Konstantin A.; ZALESKI, Andrzej Janusz; CONDREA, Elena; CHISTOL, Vitalie. Various manifestations of weak magnetism and superconductivity in inclination interfaces of Bi, Sb and Bi1-xSbx. In: Moldavian Journal of the Physical Sciences. 2021, nr. 2(20), pp. 129-135. ISSN 1810-648X.