Bulk superconductivity at an elevated temperature (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="italic">T</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>≊12 K) in a nickel containing alloy system Y-Ni-B-C

Nagarajan, Radhakrishnan; Mazumdar, Chandan; Hossain, Zakir; Dhar, S. K.; Gopalakrishnan, K. V.; Gupta, L. C.; Godart, C.; Padalia, B. D.; Vijayaraghavan, R.

doi:10.1103/physrevlett.72.274

Cited by 718 publications

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“…The non magnetic character of Ni in Bi 3 Ni is similar to that as observed earlier for the famous Ni Boro-Carbides viz. Y-Ni-B-C [15] and MgCNi 3 [16]. Detailed specific heat analysis and DFT calculations revealed that this compound is having electron-phonon coupling constant of around 1.23 and Ni is non magnetic.…”

Section: Introductionmentioning

confidence: 99%

Physical property and electronic structure characterization of bulk superconducting Bi₃Ni

Kumar

Vajpayee

et al. 2011

Supercond. Sci. Technol.

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We report the experimental and theoretical study on magnetic nature of Bi 3 Ni system. The structure is found to be orthorhombic (Pnma) with lattice parameters a = 8.879Å b = 4.0998Å and c = 4.099Å. The title compound is synthesized via a solid state reaction route by quartz vacuum encapsulation of 5N purity stoichiometric ingredients of Ni and Bi. The superconducting transition temperature is found to be 4.1 K as confirmed from magnetization and specific heat measurements. The lower critical field (H c1 ) and irreversibility field (H irr ) are around 150 and 3000Oe respectively at 2K. Upper critical field (Hc 2 ) as determined from in field (up to 4 Tesla) ac susceptibility is found to be around 2 Tesla at 2K. The normal state specific heat is fitted using Sommerfeld-Debye equation C(T) = γT + βT 3 +δT 5 and the parameters obtained are γ= 11.08mJ/mol-K 2 , β= 3.73mJ/mol-K 4 and δ= 0.0140mJ/mol-K 6 . The calculated electronic density of states (DOS) at Fermi level N(E F ) and Debye temperature Θ D are 4.697 states/eV per formula unit and 127.7K respectively. We also estimated the value of electron phonon coupling constant (λ) to be 1.23, which when substituted in MacMillan equation gives T c = 4.5K. Density functional (DFT) based calculations for experimentally determined lattice parameters show that Ni in this compound is non-magnetic and ferromagnetic interactions seem to play no role. The Stoner condition I*N(E F ) = 0.136 per Ni atom also indicates that system cannot have any ferromagnetism. The fixed spin moment (FSM) calculations by fixing total magnetic moment on the unit cell also suggested that this system does not exhibit any signatures of ferromagnetism. Further it is concluded that ferromagnetic interactions play no role in superconductivity of Bi 3 Ni. This is in contrast to a recent report [14] related to possibility of coexistence of superconductivity and magnetism in Bi 3 Ni. Our results will surely attract more researchers to work on superconductivity of this and similar Ni containing compounds. determined from Reitveld analysis of the studied Bi 3 Ni is given in Fig. 1(b). Results and DiscussionThe DC and AC magnetic susceptibility plots of studied Bi 3 Ni are shown in Fig. 2 and 3 respectively. Namely, Fig. 2(a) depicts the DC magnetic susceptibility (χ) in both zero-fieldcooled (FC) and field-cooled (FC) situations in temperature range of 2K to 10K. The applied field is 10Oe. Superconductivity is observed at 4.1K with a sharp diamagnetic transition in magnetic susceptibility (χ) in both ZFC and FC situations. The superconducting volume fraction seems to be around 87.6% as calculated from FC (χ). This is slightly higher than as reported in ref.13.Though an estimated value is given, still we believe estimating superconducting volume 4 fraction without exactly knowing the pinning properties is not correct. What one can safely conclude from Fig. 2(a) is that the studied Bi 3 Ni is a bulk superconductor with superconducting transition temperature (T c ) at 4.1K. The AC susceptibility of Bi 3 Ni i...

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Section: Introductionmentioning

confidence: 99%

Physical property and electronic structure characterization of bulk superconducting Bi₃Ni

Kumar

Vajpayee

et al. 2011

Supercond. Sci. Technol.

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“…Because it has a large proportion of Ni per unit cell, it is expected that the magnetic fluctuation would be important in determining the superconducting behavior. This system is reminiscent of another Ni-based superconductors LnNi 2 B 2 C (Ln = Y, Tm, Er, Ho, Lu) [2][3][4] . The band calculations indicate that very large and narrow energy peak in the density of states (DOS) is located just below the Fermi energy E F which has mainly the Ni 3d character 5,6 .…”

mentioning

confidence: 99%

Electronic structures of antiperovskite superconductorsMgXNi3(X=B
Shim
¹
,
Kwon
²
,
Min
³

2001
Phys. Rev. B
106
10
87
0
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We have investigated electronic structures of a newly discovered antiperovskite superconductor MgCNi3 and related compounds MgBNi3 and MgNNi3. In MgCNi3, a peak of very narrow and high density of states is located just below EF, which corresponds to the π * antibonding state of Ni-3d and C-2p but with the predominant Ni-3d character. The prominent nesting feature is observed in the Γ-centered electron Fermi surface of an octahedron-cage-like shape that originates from the 19th band. The estimated superconducting parameters based on the simple rigid-ion approximation are in reasonable agreement with experiment, suggesting that the superconductivity in MgCNi3 is described well by the conventional phonon mechanism.71.25. Pi, 74.25.Jb, 74.70.Ad

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“…Since the pioneering and seminal discovery of the superconducting alloy system Y-Ni-B-C [1,2] by Nagarajan et al, much attention has been paid to synthesizing single phase samples of quaternary boro-carbides. Cava et al [3] have synthesized the quaternary nickel borocarbides RNi 2 B 2 C (R=Y and rare earths), and found that Lu and Y compounds exhibit the highest superconducting transition temperatures (T c = 16.6 and 15.6 K, respectively), while compounds with magetic rare earths exhibit lower T c : T m (T c = 11 K), E r (T c = 10.5 K), H o (T c = 8 K).…”

Section: Introductionmentioning

confidence: 99%

First Principles Study on Structure Stability and Mechanical Properties of YNi2B2C and LuNi2B2C under Pressure

Liu

Wang

et al. 2017

Crystals

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Abstract:The pressure effects on the lattice parameters and elastic constants of the tetragonal RNi 2 B 2 C (R=Y, Lu) are investigated by means of the first principles. The predicted lattice constants and elastic constants of YNi 2 B 2 C and LuNi 2 B 2 C at 0 GPa agree well with the available data. By the elastic stability criteria under isotropic pressure, it is predicted that YNi 2 B 2 C and LuNi 2 B 2 C with tetragonal structure are not mechanically stable above 93 GPa and 50 GPa, respectively. Pugh's modulus ratio, Poisson's ratio, Vickers hardness, elastic anisotropy and Debye temperature of YNi 2 B 2 C in the pressure range of 0-100 GPa and LuNi 2 B 2 C in the pressure range of 0-60 GPa are further investigated. It is shown that the ductility and Debye temperature of tetragonal RNi 2 B 2 C (R=Y, Lu) increase with increasing pressure, and LuNi 2 B 2 C is more ductile and lower Debye temperature than YNi 2 B 2 C under different pressures.

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Bulk superconductivity at an elevated temperature (Tc≊12 K) in a nickel containing alloy system Y-Ni-B-C

Cited by 718 publications

References 3 publications

Physical property and electronic structure characterization of bulk superconducting Bi₃Ni

Physical property and electronic structure characterization of bulk superconducting Bi₃Ni

Electronic structures of antiperovskite superconductorsMgXNi3(X=B
Shim
¹
,
Kwon
²
,
Min
³

2001
Phys. Rev. B
106
10
87
0
View full text Add to dashboard Cite

First Principles Study on Structure Stability and Mechanical Properties of YNi2B2C and LuNi2B2C under Pressure

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Bulk superconductivity at an elevated temperature (Tc≊12 K) in a nickel containing alloy system Y-Ni-B-C

Cited by 718 publications

References 3 publications

Physical property and electronic structure characterization of bulk superconducting Bi3Ni

Physical property and electronic structure characterization of bulk superconducting Bi3Ni

Electronic structures of antiperovskite superconductorsMgXNi3(X=BShim1, Kwon2, Min3 2001Phys. Rev. B10610870View full textAdd to dashboardCite

First Principles Study on Structure Stability and Mechanical Properties of YNi2B2C and LuNi2B2C under Pressure

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Product

Resources

About

Physical property and electronic structure characterization of bulk superconducting Bi₃Ni

Physical property and electronic structure characterization of bulk superconducting Bi₃Ni

Electronic structures of antiperovskite superconductorsMgXNi3(X=B
Shim
¹
,
Kwon
²
,
Min
³

2001
Phys. Rev. B
106
10
87
0
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