Publisher’s Note: Giant Phonon Softening and Enhancement of Superconductivity by Phosphorus Doping of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>BaNi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>[Phys. Rev. Lett.<b>109</b>, 097002 (2012)]

Kudo, Kazuhiro; Takasuga, Masaya; Hiroi, Zenji; Nohara, M.

doi:10.1103/physrevlett.109.109901

Cited by 23 publications

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“…13 Isovalent phosphorus doping does not change its gap structure, 14 in contrast to that observed in nodal superconductor BaFe 2 (As 1−x P x ) 2 .…”

Section: Introductionmentioning

confidence: 96%

Multigap nodeless superconductivity in nickel chalcogenideTlNi2Se2

et al. 2014

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Low-temperature thermal conductivity measurements were performed on single crystals of TlNi2Se2, a nickel-chalcogenide heavy-electron superconductor with Tc ≃ 3.7 K. In zero field, the residual electronic contribution at T → 0 K (κ0/T ) was well separated from the total thermal conductivity, which is less than 0.45% of its normal-state value. Such a tiny residual κ0/T is unlikely contributed by the nodal quasiparticles. Nodeless gap structure is supported by the very weak field dependence of κ0(H)/T in low magnetic fields. In the whole field range, κ0(H)/T exhibits an "S"-shape curve, as in the case of nickel pnictides BaNi2As2 and SrNi2P2. This common feature of nickel-based superconductors can be explained by multiple nodeless superconducting gaps.

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“…13 Isovalent phosphorus doping does not change its gap structure, 14 in contrast to that observed in nodal superconductor BaFe 2 (As 1−x P x ) 2 .…”

Section: Introductionmentioning

confidence: 96%

Multigap nodeless superconductivity in nickel chalcogenideTlNi2Se2

et al. 2014

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“…Since ∆E = 0 corresponds to the tetragonal phase, the AF O XZ(Y Z) fluctuations would be dominant in the tetragonal phase. Thus, the superconductivity in the tetragonal phase with T c ∼ 3 K recently reported by Kudo et al 6 might be caused by the AF O XZ(Y Z) fluctuations with q = (π, π, π). In contrast, a large energy level shift ∆E would be required to realize the AF O X 2 −Y 2 fluctuations in the tetragonal phase.…”

Section: Discussionmentioning

confidence: 99%

“…For BaNi 2 (As 1−x P x ) 2 , a large phonon softening toward the structure transition has also been reported, 6 although the structure transition is of first order. Therefore, strong orbital fluctuations are expected to exist in BaNi 2 (As 1−x P x ) 2 as in Fe-based superconductors.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, BaNi 2 (As 1−x P x ) 2 attracts increasing attention due to its unique phase diagram, in which strong coupling superconductivity is realized next to the structure transition. [2][3][4][5][6] No evidence of spindensity-wave (SDW) order has been observed. Above the structure transition temperature T s ∼ 130 K, it has the same tetragonal structure as BaFe 2 As 2 , which is a typical parent compound of Fe-based superconductors.…”

Section: Introductionmentioning

confidence: 99%

“…Kudo et al recently reported the suppression of the structural transition in BaNi 2 (As 1−x P x ) 2 and the emergence of a new strong-coupling superconducting state (∆C/γT c ∼ 2) with T c ≥ 3.3 K for x > 0.07. 6 The undoped Fe-based superconductors also exhibit structural transition from tetragonal to orthorhombic at T s and SDW transitions at T N . [7][8][9][10][11][12] In many com- * yamakawa@s.phys.nagoya-u.ac.jp pounds, T s is higher than T N , and T s is expected to be realized by orbital polarization.…”

Section: Introductionmentioning

confidence: 99%

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Zigzag Chain Structure Transition and Orbital Fluctuations in Ni-Based Superconductors

2013

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We investigate the electronic state and structure transition of BaNi2As2, which shows a similar superconducting phase diagram as Fe-based superconductors. We construct the ten-orbital tight-binding model for BaNi2As2 by using the maximally localized Wannier function method. The Coulomb and quadrupole-quadrupole interactions are treated within the random-phase approximation. We obtain the strong developments of charge quadrupole susceptibilities driven by the in-plane and out-of-plane oscillations of Ni ions. The largest susceptibility is either O X 2 −Y 2 -quadrupole susceptibility at q = (π, 0, π) or O XZ(Y Z) -quadrupole susceptibility at q = (π, π, π), depending on the level splitting between d X 2 −Y 2 and d XZ(YZ) . These antiferro-quadrupole fluctuations would then be the origin of the strong coupling superconductivity in Ni-based superconductors. Also, we propose that the antiferro-quadrupole O X 2 −Y 2 order with q = (π, 0, π) is the origin of the zigzag chain structure reported in experiments. We identify similarities and differences between Ni-and Fe-based superconductors.

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Structural instability and superconductivity in the solid solution SrNi₂(P_1−xGe_x)₂

Hlukhyy

Hoffmann

Grinenko

et al. 2016

Physica Status Solidi (b)

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The solid solution SrNi2(P1−xGex)2 with ThCr2Si2‐type structure has been synthesized over the whole composition range by high‐temperature solid state reactions. Structure investigations were performed using X‐ray diffraction (XRD) methods. In addition, in situ temperature‐dependent powder XRD measurements down to 10 K were carried out for two SrNi2(P1−xGex)2 samples with x = 0.110(3) and 0.212(3), which indicate a temperature‐induced collapse of the structure of the first compound around 200 K. For both samples, superconductivity was detected above 1.8 K by magnetic, resistivity, and heat capacity measurements (TC ∼ 3.0 and 2.4 K, respectively). The crystal chemistry and the chemical bonding in the superconducting compounds are discussed in terms of linear muffin‐tin orbital (LMTO) band structure calculations including density of states (DOS), crystal orbital Hamilton populations (COHPs), and a topological analysis using the electron localization function (ELF).

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Publisher’s Note: Giant Phonon Softening and Enhancement of Superconductivity by Phosphorus Doping ofBaNi2As2[Phys. Rev. Lett.109, 097002 (2012)]

Cited by 23 publications

References 0 publications

Multigap nodeless superconductivity in nickel chalcogenideTlNi2Se2

Multigap nodeless superconductivity in nickel chalcogenideTlNi2Se2

Zigzag Chain Structure Transition and Orbital Fluctuations in Ni-Based Superconductors

Structural instability and superconductivity in the solid solution SrNi₂(P_1−xGe_x)₂

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Publisher’s Note: Giant Phonon Softening and Enhancement of Superconductivity by Phosphorus Doping ofBaNi2As2[Phys. Rev. Lett.109, 097002 (2012)]

Cited by 23 publications

References 0 publications

Multigap nodeless superconductivity in nickel chalcogenideTlNi2Se2

Multigap nodeless superconductivity in nickel chalcogenideTlNi2Se2

Zigzag Chain Structure Transition and Orbital Fluctuations in Ni-Based Superconductors

Structural instability and superconductivity in the solid solution SrNi2(P1−xGex)2

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Product

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Structural instability and superconductivity in the solid solution SrNi₂(P_1−xGe_x)₂