Critical current density and magnetic phase diagrams of BaFe1.29Ru0.71As2single crystals

Sharma, Shilpam; Vinod, K.; Sundar, C. S.; Bharathi, A.

doi:10.1088/0953-2048/26/1/015009

Cited by 19 publications

(12 citation statements)

References 39 publications

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“…We showed other systems that clearly exhibit similar broadening. Even where it is not so obvious, for example in the pnictides [53] (see their Fig. 1a), the Tinkham formula works very well in reproducing the broadening trend illustrated in Fig.…”

Section: Resistive Broadening Under An Applied Magnetic Fieldmentioning

confidence: 88%

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Nonstandard superconductivity or no superconductivity in hydrides under high pressure

Hirsch,

Marsiglio

2020

Preprint

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Over the past six years, superconductivity at high temperatures has been reported in a variety of hydrogen-rich compounds under high pressure. That high temperature superconductivity should exist in these materials is expected according to the conventional theory of superconductivity, as shown by detailed calculations. However here we argue that experimental observations rule out conventional superconductivity in these materials. Our results indicate that either these materials are unconventional superconductors of a novel kind, which we term 'nonstandard superconductors', or alternatively that they are not superconductors. If the former, we point out that the critical current in these materials should be five orders of magnitude larger than in standard superconductors, potentially opening up the way to important technological applications. If the latter, which we believe is more likely, we suggest that the signals interpreted as superconductivity are either experimental artifacts or they signal other interesting physics but not superconductivity.

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Section: Resistive Broadening Under An Applied Magnetic Fieldmentioning

confidence: 88%

“…FIG.12: Resistance vs temperature for BaFe1.29Ru0.71As2 for a variety of applied magnetic fields, as indicated. Experimental data, represented by the points for the various fields, is taken from Ref [53]…”

mentioning

confidence: 99%

Nonstandard superconductivity or no superconductivity in hydrides under high pressure

Hirsch,

Marsiglio

2020

Preprint

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“…Here, we investigate the SMP and pinning behavior in a single crystal of the 112 type pnictide Ca 0.82 La 0.18 Fe 0.96 Ni 0.04 As 2 superconductor with superconducting temperature transition T c ∼ 22 K [36] and moderate anisotropy [33]. A well pronounced SMP is observed in all isothermal M(H) curves obtained with H c-axis even for temperatures very close to T c (T = 20 K), and also for H ab-planes but only for temperatures above 14 K. As the SMP has been observed for H c-axis and H ab-planes in most of the pnictide superconductors [37,38,39], its absence for H ab-planes at lower temperatures (below 7.5 K) might be related to the anisotropic nature of the sample [33] that might leads to the possible emergence of two dimensional Josephson vortices at low temperatures and high magnetic fields [6,40].…”

Section: Introductionmentioning

confidence: 51%

Vortex dynamics and second magnetization peak in the iron-pnictide superconductor Ca$_{0.82}$La$_{0.18}$Fe$_{0.96}$Ni$_{0.04}$As$_2$

Llovo,

Sóñora,

Mosqueira

et al. 2021

Preprint

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We report the studies of detailed magnetic relaxation and isothermal magnetization measurements in the vortex state of the 112-type iron-pnictide Ca 0.82 La 0.18 Fe 0.96 Ni 0.04 As 2 superconductor with T c ∼ 22 K. In the isothermal M (H), a well defined second magnetization peak (SMP) feature is observed in the entire temperature range below T c for measurements with H c-axis. However, for H ab-planes, the SMP feature is suppressed at low temperatures, which might be due to 2D Josephson vortices forming at low temperatures and high magnetic fields in such an anisotropic system. A rigorous analysis considering the magnetic relaxation data for H c-axis suggests an elastic to plastic pinning crossover across H p , which also seems accompanied with a possible phase transition in vortex lattice near H p . Moreover, point disorder and surface defects are likely to be the dominant sources of pinning, which contribute to the δl-type of pinning in the sample. A high J c , in access of 10 5 A/cm 2 observed could potentially make this material technologically important.

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“…To date more , in these compounds is independent from an applied magnetic field within the range of 0 ≤ 𝐵 𝑎𝑝𝑝𝑙 𝐵 𝑐2 (0) ≤ 0.15, where Bc2(0) is the ground state upper critical field. This dependence is different from the one in Nb3Sn [42], K3C60 [43], NbN [44], MgB2 [45], YBa2Cu3O7- [46], BaFe2-xRuxAs2 (x = 0.71) [47], Ladoped CaFe2As2 [48], and β-phase Mo1-xRex [49], where Δ𝑇 𝑐 𝑇 𝑐 is broadening on the increase in 𝐵 𝑎𝑝𝑝𝑙 𝐵 𝑐2 (0) [42][43][44][45][46][47][48][49].…”

Section: Satterthwaite and Toepkementioning

confidence: 99%

Resistive transition of hydrogen-rich superconductors

Talantsev

Stolze

2021

Supercond. Sci. Technol.

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Critical temperature, T c, and transition width, ΔT c, are two primary parameters of the superconducting transition. The latter parameter reflects the superconducting state disturbance originating from the thermodynamic fluctuations, atomic disorder, applied magnetic field, the presence of secondary crystalline phases, applied pressure, etc. Recently, Hirsch and Marsiglio (2021 Phys. Rev. B 103 134505, doi: 10.1103/PhysRevB.103.134505) performed an analysis of the transition width in several near-room-temperature superconductors and reported that the reduced transition width, ΔT c/T c, in these materials does not follow the conventional trend of transition width broadening in applied magnetic field observed in low- and high-T c superconductors. Here, we present a thorough mathematical analysis of the magnetoresistive data, R(T, B), for the high-entropy alloy (ScZrNb)0.65[RhPd]0.35 and hydrogen-rich superconductors of Im-3m-H3S, C2/m-LaH10 and P63 /mmc-CeH9. We found that the reduced transition width, ΔT c/T c, in these materials follows a conventional broadening trend in applied magnetic field.

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Critical current density and magnetic phase diagrams of BaFe_1.29Ru_0.71As₂single crystals

Cited by 19 publications

References 39 publications

Nonstandard superconductivity or no superconductivity in hydrides under high pressure

Nonstandard superconductivity or no superconductivity in hydrides under high pressure

Vortex dynamics and second magnetization peak in the iron-pnictide superconductor Ca$_{0.82}$La$_{0.18}$Fe$_{0.96}$Ni$_{0.04}$As$_2$

Resistive transition of hydrogen-rich superconductors

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