Doping-induced superconductivity of 
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 and 
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Barbero, Nicolò; Shiroka, T.; Delley, B.; Grant, Ted; Machado, A. J. S.; Fisk, Z.; Ott, H. R.; Mesot, J.

doi:10.1103/physrevb.95.094505

Cited by 21 publications

(10 citation statements)

References 42 publications

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“…5 in Ref. 54), such a value indicates a good metallicity, i.e., a relatively high electron density of states at the Fermi level. Upon closer inspection we note that, after a minimum at ∼ 20 K, 1/T 1 T increases slightly with temperature.…”

Section: H 31 P Nmr In the Normal Phasementioning

confidence: 88%

Nodeless superconductivity and preserved time-reversal symmetry in the noncentrosymmetric Mo3P superconductor

et al. 2019

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We report a comprehensive study of the noncentrosymmetric superconductor Mo 3 P. Its bulk superconductivity, with T c = 5.5 K, was characterized via electrical resistivity, magnetization, and heat-capacity measurements, while its microscopic electronic properties were investigated by means of muon-spin rotation/relaxation (µSR) and nuclear magnetic resonance (NMR) techniques. In the normal state, NMR relaxation data indicate an almost ideal metallic behavior, confirmed by band-structure calculations, which suggest a relatively high electron density of states, dominated by the Mo 4d-orbitals. The low-temperature superfluid density, determined via transverse-field µSR and electronic specific heat, suggest a fully-gapped superconducting state in Mo 3 P, with ∆ 0 = 0.83 meV, the same as the BCS gap value in the weak-coupling case, and a zero-temperature magnetic penetration depth λ 0 = 126 nm. The absence of spontaneous magnetic fields below the onset of superconductivity, as determined from zero-field µSR measurements, indicates a preserved time-reversal symmetry in the superconducting state of Mo 3 P and, hence, spin-singlet pairing. Superconductivity and spin-orbit coupling in non-centrosymmetric materials:A review, Rep. Prog. Phys. 80, 036501 (2017).

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Section: H 31 P Nmr In the Normal Phasementioning

confidence: 88%

Nodeless superconductivity and preserved time-reversal symmetry in the noncentrosymmetric Mo3P superconductor

et al. 2019

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“…In a first approximation, the estimated value of (T 1 T ) −1 at low temperature is about 4.72 s −1 K −1 . By a comparison to diborides, such as MgB 2 , AlB 2 , and ZrB 2 (also binary superconductors [42]), this value indicates a relatively high electron density of states at the Fermi level (here dominated by the Zr and Pt d bands). Now we discuss the NMR relaxation rates in the superconducting state.…”

Section: Dynamic Electronic Properties: Relaxation Ratesmentioning

confidence: 96%

Fully gapped superconducting state in interstitial-carbon-doped Zr5Pt3

et al. 2022

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We report a comprehensive study of the Zr 5 Pt 3 C x superconductors, with interstitial carbon between 0 and 0.3. At a macroscopic level, their superconductivity, with T c ranging from 4.5 to 6.3 K, was investigated via electricalresistivity, magnetic-susceptibility, and specific-heat measurements. The upper critical fields μ 0 H c2 ∼ 7 T were determined mostly from measurements of the electrical resistivity in applied magnetic field. The microscopic electronic properties were investigated by means of muon-spin rotation and relaxation (μSR) and nuclear magnetic resonance (NMR) techniques. In the normal state, NMR relaxation data indicate an almost ideal metallic behavior, confirmed by band-structure calculations, which suggest a relatively high electronic density of states at the Fermi level, dominated by the Zr 4d orbitals. The low-temperature superfluid density, obtained via transverse-field μSR, suggests a fully gapped superconducting state in Zr 5 Pt 3 and Zr 5 Pt 3 C 0.3 , with zerotemperature gap 0 = 1.20 and 0.60 meV and magnetic penetration depth λ 0 = 333 and 493 nm, respectively. The exponential dependence of the NMR relaxation rates below T c further supports nodeless superconductivity. The absence of spontaneous magnetic fields below the onset of superconductivity, as determined from zero-field μSR measurements, confirms the preserved time-reversal symmetry in the superconducting state of Zr 5 Pt 3 C x . In contrast to a previous study, our μSR and NMR results suggest conventional superconductivity in the Zr 5 Pt 3 C x family, independent of the C content.

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“…[6,7] Recently, they were investigated for superconductivity as well as thin film applications too. [8][9][10][11][12][13] Thus, metal diborides are interesting for low to ultra high temperature applications. [1,14,15] ZrB 2 and HfB 2 have gained much attention recently due to their higher stability.…”

Section: Introductionmentioning

confidence: 99%

Site independent strong phonon-vacancy scattering in high temperature ceramics ZrB$_2$ and HfB$_2$

Sonar¹,

Dehankar²,

Vijayalakshmi³

et al. 2022

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Similar effects of metal and boron vacancies on phonon scattering and lattice thermal conductivity (κ l ) of ZrB2 and HfB2 are reported. These defects challenge the conventional understanding that associates larger impacts to bigger defects. We find the underlying reason to be a strong local perturbation caused by the boron vacancy that substantially changes the interatomic force constants. In contrast, a long ranged but weaker perturbation is seen in the case metal vacancies. We show that these behaviours originate from a mixed metallic and covalent bonding nature in the metal diborides. The thermal transport calculations are performed in a complete ab initio framework based on Boltzmann transport equation and density functional theory. Phonon-vacancy scattering is calculated using ab initio Green's function approach. Effects of natural isotopes and grain boundaries on κ l are also systematically investigated, however we find an influential role of vacancies to explain large variations seen in the experiments. We further report a two-order of magnitude difference between the amorphous and pure-crystal limits. Our results outline significant material design aspects for these multi-functional high temperature ceramics.

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Doping-induced superconductivity of ZrB2 and HfB2

Cited by 21 publications

References 42 publications

Nodeless superconductivity and preserved time-reversal symmetry in the noncentrosymmetric Mo3P superconductor

Nodeless superconductivity and preserved time-reversal symmetry in the noncentrosymmetric Mo3P superconductor

Fully gapped superconducting state in interstitial-carbon-doped Zr5Pt3

Site independent strong phonon-vacancy scattering in high temperature ceramics ZrB$_2$ and HfB$_2$

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