Disordered Nanocrystalline Superconducting PbMo6S8 with a Very Large Upper Critical Field

H. J. Niu; D. P. Hampshire

doi:10.1103/PhysRevLett.91.027002

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Disordered Nanocrystalline Superconducting PbMo6S8 with a Very Large Upper Critical Field

H. J. Niu, D. P. Hampshire

DOI 10.1103/PhysRevLett.91.027002 · Physical Review Letters

T1

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Abstract

Large increases in the upper critical field BC2(0) are reported in bulk superconductors that demonstrate another novel property for nanocrystalline materials. Disordered nanocrystalline PbMo6S8 superconductors were fabricated by mechanical milling and hot isostatic pressing. Conventional PbMo6S8 has BC2(0)∼50 T. The nanocrystalline materials have higher resistivity (ρN) and BC2(0)∼100 T. The disorder produced in these nanocrystalline materials is significantly different from that produced by doping because it increases ρN and, hence, BC2(0) without significantly reducing the electronic density of states or superconducting transition temperature (TC). Furthermore, the disorder reduces the electron mean-free path to ∼1 nm which is more than an order of magnitude smaller than the grain size and necessary to achieve the unprecedented increase in BC2(0).

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
PbMo6S8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15.05	Pressure not reported	onset
PbMo6S8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	12.3	Pressure not reported	onset
Pb1-xCu1.8xMo6S8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	13.65	Pressure not reported	unknown
NbTi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Nb3Sn Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown