2013
DOI: 10.7566/jpsj.82.094704
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Zigzag Chain Structure Transition and Orbital Fluctuations in Ni-Based Superconductors

Abstract: 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. T… Show more

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Cited by 9 publications
(5 citation statements)
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“…Nickel-based 122-type compounds, such as BaNi 2 As 2 [1][2][3][4][5][6][7][8], SrNi 2 As 2 [9], BaNi 2 P 2 [10,11], SrNi 2 P 2 [12][13][14][15][16], BaNi 2 Ge 2 [17,18], and SrNi 2 Ge 2 [19] are nonmagnetic analogs of iron-based superconductors. Some of these compounds have provided opportunities for investigating the interplay between structural instability and superconductivity upon chemical doping [7,15,16,18].…”
mentioning
confidence: 99%
“…Nickel-based 122-type compounds, such as BaNi 2 As 2 [1][2][3][4][5][6][7][8], SrNi 2 As 2 [9], BaNi 2 P 2 [10,11], SrNi 2 P 2 [12][13][14][15][16], BaNi 2 Ge 2 [17,18], and SrNi 2 Ge 2 [19] are nonmagnetic analogs of iron-based superconductors. Some of these compounds have provided opportunities for investigating the interplay between structural instability and superconductivity upon chemical doping [7,15,16,18].…”
mentioning
confidence: 99%
“…However, for the magnetic state, there is no band structure report for comparison. [33][34][35][36][37].…”
Section: Band Structurementioning
confidence: 98%
“…Our calculated data in the nonmagnetic state agree well with the other Table 1 Equilibrium lattice parameters, unit cell volume, z component of the As ionic position (z As ), and α, β, and γ angles (see Fig. 1a) of BaFe 2−x Ni x As 2 for x = 0.0-2.0 in the nonmagnetic and AFM1 states; the experimental data at T = 175 K in nonmagnetic state [14] and T = 5 K in AFM1 state [28] have been added for comparison Nonmagnetic state reports [30][31][32][33][34][35][36][37]. However, for the magnetic state, there is no band structure report for comparison.…”
Section: Band Structurementioning
confidence: 99%
“…While the effect of phonon softening on pairing near such a strongly discontinuous structural boundary cannot be ignored, the distinct behavior found in the Ba(Ni 1−x Co x ) 2 As 2 series suggests another mechanism is responsible for the strengthening of superconductivity, which appears to be centered around the triclinictetragonal critical point. The recent observations of CDW order in BaNi 2 As 2 [24] are a provocative suggestion that the previously mundane view of both superconductivity and the structural distortion in BaNi 2 As 2 should be revisited, and that fluctuation-driven superconductivity is a real possibility [15]. Further, uncovering a new mechanism for superconducting enhancement opens an interesting avenue to potentially extend superconductivity to even higher critical temperatures in this and related systems.…”
Section: Previous Reports Of Chemical Substitution Inmentioning
confidence: 99%
“…However, in BaNi 2 As 2 the structural distortion is between a high temperature tetragonal and low temperature triclinic, rather than orthorhombic, symmetry, and has no associated magnetic order [13,14]. Rather, theoretical work has suggested that the zig-zag chain structure in the triclinic distortion is driven by orbital ordering, explaining the lack of magnetic order [15]. BaNi 2 As 2 also displays bulk superconductivity below T c = 0.7 K [12], suggested to be conventional BCS-type in nature with a fully-gapped s-wave order parameter symmetry [16,17].…”
Section: Introductionmentioning
confidence: 99%