-
4
-
-
84950538145
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Cases where peaks in [formula omitted] have been rigorously identified with a flux-line lattice-parameter matching mechanism do exist, particularly in precipitate systems [see
-
(1970)
Z. Metallkd.
, vol.61
, pp. 724
-
-
Petermann, J.1
-
5
-
-
84996193799
-
-
However it is no longer possible to claim such a mechanism without detailed measurements of [formula omitted] as a function of T to back it up.
-
(1972)
Philos. Mag.
, vol.25
, pp. 303
-
-
Koch, C.C.1
Carpenter, R.W.2
-
11
-
-
84950520813
-
Cold working is not necessary as the peak effect has been observed in the brittle compounds [formula omitted] [formula omitted] and NbN[see for example
-
Refs. 30 and 7].
-
(1969)
J. Low Temp. Phys.
, vol.1
, pp. 19
-
-
Otto, G.1
Sauer, E.2
Wizgall, H.3
-
16
-
-
84950545599
-
Colloque international sur “Les champs magnetiques intenses, leur production et leurs applications”
-
Colloque No. 166 (Centre National de la Recherche Scientifique, Grenoble)
-
(1966)
, pp. 223
-
-
Saur, E.1
Wizgall, H.2
-
25
-
-
84950596873
-
Actually a more realistic expression for n would be [formula omitted] where α is a constant, since n cannot be less than one from our assumption of one initially pinned flux line per group.
-
Thus Eq. (11) and succeeding formulas correspond to the limit [formula omitted] It is important to note that even if the opposite extreme is assumed, i.e. [formula omitted] the [formula omitted] that would result is proportional to [formula omitted] Thus [formula omitted] in the line pinning limit is always an increasing function of h in contrast [formula omitted] computed for the point pinning limit (Ref. 22).
-
-
-
-
26
-
-
84950596870
-
The parameter P depends to some extent on the geometry assumed.
-
If a large cylinder of FLL of radius [formula omitted] around each pin is assumed (Ref. 22),[formula omitted] [formula omitted] If the line pins are considered to form in planes parallel to the Lorentz force, spaced by a distance [formula omitted] [formula omitted] (Appendix II). Since other factors seem much more important, we will neglect the possibility of a slight field and temperature dependence of P.
-
-
-
-
28
-
-
84950596871
-
The possibility of flux line dislocations (FLDs) and FLD dipole participating in this plastic shear process may be important for weaker pinning materials where the pin spacing is large but for hard superconductors, where line pins are likely to be closely spaced, the chances of finding an FLD source between pins is negligible.
-
Although the actual plastic shear process may involve the nucleation (out of perfect FLL) of FLD’s, the critical shear stress for such nucleation is close to the [formula omitted] for synchronous shear of one plane of the FLL over another.
-
-
-
-
34
-
-
84950596868
-
Even if one concedes that [formula omitted] is not known very well in the Ti-Nb system and computes instead the values of [formula omitted] required to give agreement between the model of Bychkov and their experimental results, one finds the [formula omitted] necessary to be of order 2000, which is clearly unreasonable.
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