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Vortex state

Figure 13.16 Magnetization verses applied magnetic field for (a) a type I superconductor and (b) a type II superconductor. For the type I superconductor, the magnetic flux does not penetrate the sample below 9 Cc where the sample is a superconductor. Above rMc, the sample is a normal conductor. For the type II superconductor, the magnetic field starts to penetrate the sample at 3Cc, 1, a magnetic field less than rXc, the thermodynamic critical field. Superconductivity remains in the so-called vortex state between 9 c and Ci2 until WCt2 is attained. At this magnetic field, complete penetration occurs, and the sample becomes a normal conductor. Figure 13.16 Magnetization verses applied magnetic field for (a) a type I superconductor and (b) a type II superconductor. For the type I superconductor, the magnetic flux does not penetrate the sample below 9 Cc where the sample is a superconductor. Above rMc, the sample is a normal conductor. For the type II superconductor, the magnetic field starts to penetrate the sample at 3Cc, 1, a magnetic field less than rXc, the thermodynamic critical field. Superconductivity remains in the so-called vortex state between 9 c and Ci2 until WCt2 is attained. At this magnetic field, complete penetration occurs, and the sample becomes a normal conductor.
Note than typical domain-wall widths are much smaller than the domains themselves. When the size of a magnetic particle is smaller than the domain-wall width Sa, as encountered for example in small soft-magnetic nanodots, then the distinction between domains and domain walls blurrs, and the determination of the micromagnetic spin structure requires additional considerations [102], One example is curling-type flux-closure or vortex states. [Pg.60]

Figure 16. Amplified (8 x) phase images of 400 nm/ 50 nm Co ring during entire hysteresis cycle. In-plane filed magnitude indicated below each image (units of Oe). Note vortex states visible in (d), (e) and (j), (k) [23]. Figure 16. Amplified (8 x) phase images of 400 nm/ 50 nm Co ring during entire hysteresis cycle. In-plane filed magnitude indicated below each image (units of Oe). Note vortex states visible in (d), (e) and (j), (k) [23].
Coexistence of a SC and the IC AF phases at low temperatures was confirmed recently by the neutron diffraction experiments [31] for La2 xSrxCu04 (x = 0.10) in the vortex state. (The coexistence of SC and AF formations was found also from the //S11 spectra [32]). The way of the "coexistence of SC and the stripe order in the same sample remains unresolved one view treats the new stripe symmetry as a superstructure superimposed on the Fermi surface that changes the energy spectrum like any SDW/CDW can do it (e.g. [33]). Another plausible alternative would be a spatially inhomogeneous coexistence of the nonsuperconducting IC AF phase and a "metallic phase with strong fluctuations. [Pg.61]

Abstract Spatially-resolved NMR is used to probe antiferromagnetism in the vortex state of nearly optimally doped high-rc cuprate H2Ba2CuC>6+a (Tc = 85 K). The broadened 205Tl-spectra below 20 K and the temperature dependence of the enhanced nuclear spin-lattice relaxation rate 205 Tfl at the vortex core region indicate clear evidences of the antiferromagnetic order inside the vortex core ofTl2Ba2Cu06+J. [Pg.63]

Type 2 This behaviour is not so clear cut. At small values of the applied field, the material behaves in the same way as a type 1 superconductor and there is not penetration by the field. Similarly, at high values of the applied field the field readily penetrates the whole sample. However, at intermediate values, between the two extremes, there is partial penetration by the field and the sample exhibits a complex structure. There are mixed regions in the superconducting and normal state. This is known as the vortex state. This means that in type 2 materials the magnetization diminishes gradually rather than suddenly (Figure 5.28)... [Pg.125]

Here dJg(y) is the beam-induced change of the supercurrent density at the coordinate point y. A typical LTSEM voltage image obtained in this way is shown in Fig. 5.11 for a bicrystal YBa2Cu307 5 grain boundary junction of 23 pm width. The image is recorded at 83 K and displays the pair current density distribution of the 4-5 vortex state. (It is this state which is also shown... [Pg.119]

Figure 2-4. Magnetization versus applied magnetic field for a type II superconductor. The flux starts to penetrate the specimen at a field Wei lower than the thermodynamic critical field The specimen is in a vortex state between Wei and Wc2 and it has superconducting electrical properties up to We2. (From Kittel [18].)... Figure 2-4. Magnetization versus applied magnetic field for a type II superconductor. The flux starts to penetrate the specimen at a field Wei lower than the thermodynamic critical field The specimen is in a vortex state between Wei and Wc2 and it has superconducting electrical properties up to We2. (From Kittel [18].)...
Fig. 13. Analogous phase diagrams for the Vortex state in superconductors and the screw... Fig. 13. Analogous phase diagrams for the Vortex state in superconductors and the screw...

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