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Tralshawala, N.; Zasadzinski, J. F.; Coffey, L.; Gai, W.; Romalis, Michael; Huang, Qiang; Vaglio, R.

doi:10.1103/physrevb.51.3812

Cited by 31 publications

(18 citation statements)

References 29 publications

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“…This model successfully describes the high-temperature resistivity data for Nb, V, A15 compounds and for VN. 15 As reported in Fig. 3, the resistivity data for our ZrN film can be well fitted by Eq.…”

Section: DC Resistivity Measurementssupporting

confidence: 63%

Transport properties of ZrN superconducting films

et al. 2000

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Superconductivity in nitrides presents intriguing aspects related to the role of optical phonons. In the present paper we report on high-quality superconducting zirconium nitride film preparation and characterization ͑including Raman scattering͒ as well as on both dc and microwave frequency transport properties. The hightemperature dc resistivity shows no evidence of saturation effects, possibly due to the low electron-phonon coupling. Surface impedance data can be well fitted by the standard BCS expressions. The data provide further evidence of the ''conventional'' nature of superconductivity in these compounds.

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Section: DC Resistivity Measurementssupporting

confidence: 63%

Transport properties of ZrN superconducting films

et al. 2000

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“…Here, we obtain RRR = 16 for VN/MgO(011). Reported values for high-crystalline-quality group-IVB ZrN/MgO(001) layers are 15 [15], while previous studies of VN thin films yield RRR values of 8.4 [65] and 10 [67]. The relatively large RRR value obtained here reflects the stoichiometry and high structural quality of the present VN films.…”

Section: Vn Temperature-dependent Resistivitymentioning

confidence: 54%

“…The VN/MgO(011) room-temperature resistivity, ρ 300 K = 33.0 μ cm, is lower than reported results for polycrystalline bulk VN, 85 μ cm [40], and VN thin films, 34−57 μ cm [64][65][66][67]. Measured temperature-dependent VN/MgO(011) resistivities ρ(T ) between 300 and 4 K are presented in Fig.…”

Section: Vn Temperature-dependent Resistivitymentioning

confidence: 70%

“…It has been proposed that the temperature-dependent resistivity of VN exhibits saturation [67,69], a sublinear decrease in resistivity with decreasing temperature, as is typical of A15-structure compounds [70][71][72] for which strong electron/phonon scattering reduces electron mean free paths to lengths comparable to interatomic spacings [73]. However, for VN, the temperature below which the slope dρ/dT decreases more rapidly coincides with the cubic-to-tetragonal phase-transition temperature (T c = 250 K) determined by temperature-dependent SAED (Fig.…”

Section: Vn Temperature-dependent Resistivitymentioning

confidence: 99%

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Dynamic and structural stability of cubic vanadium nitride

et al. 2015

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Structural phase transitions in epitaxial stoichiometric VN/MgO(011) thin films are investigated using temperature-dependent synchrotron x-ray diffraction (XRD), selected-area electron diffraction (SAED), resistivity measurements, high-resolution cross-sectional transmission electron microscopy, and ab initio molecular dynamics (AIMD). At room temperature, VN has the B1 NaCl structure. However, below T c = 250 K, XRD and SAED results reveal forbidden (00l) reflections of mixed parity associated with a noncentrosymmetric tetragonal structure. The intensities of the forbidden reflections increase with decreasing temperature following the scaling behavior I ∝ (T c − T ) 1/2 . Resistivity measurements between 300 and 4 K consist of two linear regimes resulting from different electron/phonon coupling strengths in the cubic and tetragonal-VN phases. The VN transport Eliashberg spectral function α 2 tr F ( ω), the product of the phonon density of states F ( ω) and the transport electron/phonon coupling strength α 2 tr ( ω), is determined and used in combination with AIMD renormalized phonon dispersion relations to show that anharmonic vibrations stabilize the NaCl structure at T > T c . Free-energy contributions due to vibrational entropy, often neglected in theoretical modeling, are essential for understanding the room-temperature stability of NaCl-structure VN, and of strongly anharmonic systems in general.

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“…The hypothetical cubic BaBi03 must be metallic from the calculation but is monoclinic and the distortion opens up an energy gap. [221,[345][346][347][348][349]. In this mode the modulation of the overlap between the ligand 0 2p and Bi6 s orbitals becomes maximized, as shown in Fig.…”

Section: Introduction To Electronic Statesmentioning

confidence: 83%