Coexistence of Ferromagnetism and Superconductivity in Rapidly Quenched Ni<sub>2</sub>NbSn Heusler Alloy

Kaňuch, Peter; Ryba, T.; Gamcová, J.; Kaňuchová, Mária; Ďurišin, Martin; Saksl, K.; Vargová, Zuzana; Varga, R.

doi:10.12693/aphyspola.131.1057

Cited by 4 publications

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“…When prepared by rapid quenching, they could show the coexistence of ferromagnetism and superconductivity at low temperatures. [ 145 ] In contrast, they show some disadvantages for production due to the quite high melting temperature (sometimes higher than melting temperature of Pyrex glass) and chemical reaction of elements with the glass, which hinders the production of the glass‐coated microwire. We were able to produce Ni 2 NbSn microwire with a diameter of metallic nucleus 500 μm and a total diameter of 700 μm.…”

Section: Heusler Microwiresmentioning

confidence: 99%

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Heusler alloys present a large group of binary, [1][2][3][4][5] ternary, [6][7][8][9][10] or quaternary [11][12][13][14] compounds with a wide variety of physical properties. [15][16][17][18] Thanks to their extensive tunability [19][20][21][22] based on their chemical composition, crystal, or electronic structure, [23][24][25][26][27][28][29] they attract interest in the fundamental and application approach. [30][31][32][33][34] Particularly, spin polarization, [33,35] superconductivity, [36][37][38][39] shape memory, [40][41][42][43][44][45] or magnetocaloric behavior [28,40,[46][47][48][49][50] have triggered significant interest in the experimental and theoretical perspective.Based on the chemical composition and the resulting properties, Heusler alloys, also known as full-Heusler alloys with the stoichiometry X 2 YZ, can be divided into several groups according to their physical properties. [51] Co 2 YZ-based Heusler can be considered the leading group of materials showing high spin polarization (P) or even half metallicity (P ¼ 100%). [52][53][54][55][56][57] However, theoretical and experimental studies point to the high sensitivity of spin polarization on the structural disorder. [58] Here, the L2 1 crystalline phase exhibits the highest structural ordering, essential for achieving the required spin polarization values. [59] In contrast, while the mutual exchange of the atoms on the Y-Z position (B2 disorder) has a low influence on the spin polarization values, the X-Y or X-Y-Z disorders (D0 3 or A2, respectively) may significantly decrease spin polarization values. [55,60,61] The presented disadvantage can be solved by a suitable chemical composition or a proper method of preparation of Heusler alloys. [62,63] Stoichiometric and off-stoichiometric Ni-Mn-Z- [64][65][66] and Ni-Fe-Z-based Heusler alloys [67][68][69] are well-known magnetocaloric, shape memory, or even magnetic shape memory materials. [70,71] The mentioned Heusler alloys undergo a structural transformation from a low-temperature martensitic phase to a high-temperature austenitic phase, [51,[64][65][66][72][73][74] which may significantly influence the magnetic entropy change ΔS M and the intensity of the magnetocaloric effect. [75,76] Additionally, Heusler alloys consist of cheap elements like Ni, Fe, Mn, Co, Ga, and In, and thus may be considered low-cost counterparts for typical magnetocaloric material based on Gd, Rh, or other rare-earth elements. [77][78][79][80][81] Another advantage of the Ni-Mn-Zand Ni-Fe-Z-based Heusler alloys consists in the tunability of their structural and magnetic properties. Depending on the

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Section: Heusler Microwiresmentioning

confidence: 99%

“…Contrary to rapidly quenched ribbons, [ 145 ] the glass‐coated microwire does not show ferromagnetic behavior ( Figure ). The hysteresis loop shows typical superconductive behavior at low fields combined with the paramagnetic behavior at the magnetic field above 20 kOe.…”

Section: Heusler Microwiresmentioning

confidence: 99%