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Bud’ko, S.L.; Davis, M.F.; Wolfe, J. C.; Chu, C. W.; Hor, P. H.

doi:10.1103/physrevb.47.2835

Cited by 18 publications

(5 citation statements)

References 26 publications

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“…The d(lnJ c )/dP values that have been found are more significant than for yttrium barium copper oxide(YBCO) [35]. We also found that H irr of NaFe 0.97 Co 0.03 As is significantly increased by pressure.…”

supporting

confidence: 46%

Giant enhancement in critical current density, up to a hundredfold, in superconducting NaFe0.97Co0.03 As single crystals under hydrostatic pressure

Shabbir

Wang

Ghorbani

et al. 2015

Sci Rep

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Tremendous efforts towards improvement in the critical current density “Jc” of iron based superconductors (FeSCs), especially at relatively low temperatures and magnetic fields, have been made so far through different methods, resulting in real progress. Jc at high temperatures in high fields still needs to be further improved, however, in order to meet the requirements of practical applications. Here, we demonstrate a simple approach to achieve this. Hydrostatic pressure can significantly enhance Jc in NaFe0.97Co0.03As single crystals by at least tenfold at low field and more than a hundredfold at high fields. Significant enhancement in the in-field performance of NaFe0.97Co0.03As single crystal in terms of pinning force density (Fp) is found at high pressures. At high fields, the Fp is over 20 and 80 times higher than under ambient pressure at12 K and 14 K, respectively, at P = 1 GPa. We believe that the Co-doped NaFeAs compounds are very exciting and deserve to be more intensively investigated. Finally, it is worthwhile to say that by using hydrostatic pressure, we can achieve more milestones in terms of high Jc values in tapes, wires or films of other Fe-based superconductors.

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supporting

confidence: 46%

Giant enhancement in critical current density, up to a hundredfold, in superconducting NaFe0.97Co0.03 As single crystals under hydrostatic pressure

Shabbir

Wang

Ghorbani

et al. 2015

Sci Rep

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“…S1 in SI, deviates from the trend in J c as a function of T c,0 , underlining that an additional source of pinning is indeed required to explain this anomaly. The possibility of the enhancement in J c due to improved grain boundary connectivity has been reported in some high-T c cuprate superconductors 22,23 or in the iron-based polycrystalline superconductor Sr 4 V 2 O 6 Fe 2 As 2 (ref. 24).…”

Section: Discussionmentioning

confidence: 95%

Enhanced critical current density in the pressure-induced magnetic state of the high-temperature superconductor FeSe

Jung

Kang

Park

et al. 2015

Sci Rep

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We investigate the relation of the critical current density (Jc) and the remarkably increased superconducting transition temperature (Tc) for the FeSe single crystals under pressures up to 2.43 GPa, where the Tc is increased by ~8 K/GPa. The critical current density corresponding to the free flux flow is monotonically enhanced by pressure which is due to the increase in Tc, whereas the depinning critical current density at which the vortex starts to move is more influenced by the pressure-induced magnetic state compared to the increase of Tc. Unlike other high-Tc superconductors, FeSe is not magnetic, but superconducting at ambient pressure. Above a critical pressure where magnetic state is induced and coexists with superconductivity, the depinning Jc abruptly increases even though the increase of the zero-resistivity Tc is negligible, directly indicating that the flux pinning property compared to the Tc enhancement is a more crucial factor for an achievement of a large Jc. In addition, the sharp increase in Jc in the coexisting superconducting phase of FeSe demonstrates that vortices can be effectively trapped by the competing antiferromagnetic order, even though its antagonistic nature against superconductivity is well documented. These results provide new guidance toward technological applications of high-temperature superconductors.

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“…21 For quantitative interpretation, studies of pressure-dependent effects involving a single well-defined GB are clearly needed. Such experiments have recently become possible with the availability of single ͓001͔-tilt GB in bicrystalline rings of YBa 2 Cu 3 O x with varying misorientation angle and oxygen content x.…”

Section: Introductionmentioning

confidence: 99%

Pressure-induced enhancement of the critical current density in superconductingYBa2Cu3Oxbicrystalline rings

et al. 2006

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The dependence of the critical current density J c ͑T͒ on hydrostatic He-gas pressure to 0.6 GPa is determined for nearly optimally doped and strongly underdoped melt-textured YBa 2 Cu 3 O x bicrystalline rings containing single ͓001͔-tilt grain boundaries ͑GBs͒ with mismatch angles from 0°to 31°. For all samples with Ͼ 0°, J c is found to increase rapidly under pressure, the rate of increase lying predominantly in the range +20 to +50 % GPa −1 . Within a simple tunneling model, this rate of increase is far too large to be accounted for by a decrease in the GB width W alone. Large oxygen relaxation phenomena in the GB are observed for all rings with finite , particularly if they are underdoped. A diagnostic method is introduced ͑pressure-induced J c relaxation͒ which reveals a significant concentration of vacant oxygen sites in the GB region. A concerted effort to fill such sites with oxygen anions, as well as to chemically compress the GB itself, should lead to significant enhancements in J c under ambient conditions.

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Pressure and temperature dependence of the critical current density inYBa2Cu3

Cited by 18 publications

References 26 publications

Giant enhancement in critical current density, up to a hundredfold, in superconducting NaFe0.97Co0.03 As single crystals under hydrostatic pressure

Giant enhancement in critical current density, up to a hundredfold, in superconducting NaFe0.97Co0.03 As single crystals under hydrostatic pressure

Enhanced critical current density in the pressure-induced magnetic state of the high-temperature superconductor FeSe

Pressure-induced enhancement of the critical current density in superconductingYBa2Cu3Oxbicrystalline rings

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