| Records |
| Author |
Sereni, J.G.; Huber, J.G.; Luengo, C.A.; Maple, M.B. |
Title  |
Specific heat of superconducting Th, Sc and Th, Y alloys with Ce |
Type |
Journal Article |
| Year |
1975 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
17 |
Issue |
12 |
Pages |
1581-1583 |
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| Abstract |
Measurements of the specific heat jump ΔC at the superconducting critical temperature Tc on (Image )Ce and (Image )Ce Ce impurity, solid solution alloy systems indicate that the former systems obey the BCS law of corresponding states (LCS) characteristic of superconductors with non-magnetic impurities while the latter systems present deviations from the LCS linear relation between reduced parameters which are attributed to the development of localized moments at the Ce ions as the Y concentration increases. |
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| ISSN |
0038-1098 |
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| Notes |
ISI:A1975AZ36600027 |
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no |
| Call Number |
BT @ hernan @ |
Serial |
141 |
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| Author |
Braun, E.; Bürger, A.; Roden, B.; Sereni, J.G. |
| Title |
Spin glass-like behaviour of the singlet ground state system: ThTb |
Type |
Journal Article |
| Year |
1988 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
66 |
Issue |
11 |
Pages |
1141-1144 |
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| Abstract |
We have studied the temperature and field dependence of the magnetic susceptibility, X, on the single-ground-state Th1?nTbn system, in the 0.2 < n < 0.6 concentration range. The characteristic maximum of a spin glass transition was found at a temperature Tg, which increases linearly with the impurity concentration. As expected, the maximum of X is reduced by the increment of the applied magnetic field. The spin glass order parameter, as well as its critical exponent were evaluated by using the Sherrington-Kirkpatrick theory. |
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0038-1098 |
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no |
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BT @ pedrazp @ |
Serial |
577 |
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| Author |
Kim, J.; Haberkorn, N.; Nazaretski, E.; Paula, R. de; Tan, T.; Xi, X.X.; Tajima, T.; Movshovich, R.; Civale, L. |
| Title |
Strong magnetic field dependence of critical current densities and vortex activation energies in an anisotropic clean MgB2 thin film |
Type |
Journal Article |
| Year |
2015 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
204 |
Issue |
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Pages |
56-60 |
| Keywords |
A. Superconducting materials; B. Films; C. Magnetic penetration depth; D. Vortex pinning |
| Abstract |
We report the influence of two-band superconductivity on the flux creep and the critical current densities of a MgB2 thin film. The small magnetic penetration depth of λ=50±10 nm at T=4 K is related to a clean π-band. We find a high self-field critical current density Jc, which is strongly reduced with applied magnetic field, and attribute this to suppression of the superconductivity in the π-band. The temperature dependence of the creep rate S (T) at low magnetic field can be explained by a simple Anderson–Kim mechanism. The system shows high pinning energies at low field that are strongly suppressed by high field. |
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0038-1098 |
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BT @ pedrazp @ |
Serial |
729 |
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| Author |
Haberkorn, N.; Suárez, S.; Bud'ko, S.L.; Canfield, P.C. |
| Title |
Strong pinning and slow flux creep relaxation in Co-doped CaFe2As2 single crystals |
Type |
Journal Article |
| Year |
2020 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
318 |
Issue |
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Pages |
113963 |
| Keywords |
Iron based superconductors; Single crystals; Vortex dynamics; Magnetization |
| Abstract |
We report on measurements of critical current densities Jc and flux creep rates S of freestanding Ca(Fe1−xCox)2As2 (x ≈ 0.033) single crystals with Tc ≈ 15.7 K by performing magnetization measurements. The magnetic field dependences of Jc at low temperature display features related to strong pinning. In addition, we find that the system displays small flux creep rates. The characteristic glassy exponent, μ, and the pinning energy, U0, display exceptional high values for pristine crystals. We find that for magnetic fields between 0.3 T and 1 T, μ decreases from ≈ 2.8 to ≈ 2 and U0 remains ≈ 300 K. Analysis of the pinning force indicates that the mechanism is similar to the observed in polycrystalline systems in which grain boundaries and random disorder produce the vortex pinning. Considering the large U0 observed in the single crystal, we attempt to improve the pinning by adding random point disorder by 3 MeV proton irradiation with a fluence of 2 × 1016 proton/cm2. The results show that, unlike other iron-based superconductors, the superconducting fraction is sharply reduced by irradiation. This fact indicates that the superconductivity in the system is extremely fragile to an increment in the disorder. The superconducting volume fraction in the irradiated crystal systematically recovers after removal disorder by thermal annealing, which evidences as to the observation of critical state in curves of magnetization versus magnetic field. No features related to a reentrant antiferromagnetic transition are observed for the irradiated sample. |
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0038-1098 |
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no |
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BT @ pedrazp @ |
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859 |
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| Author |
Arce, R.; de la Cruz, F.; Guimpel, J. |
| Title |
Superconducting behavior of amorphous Zr70Cu30 |
Type |
Journal Article |
| Year |
1983 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
47 |
Issue |
11 |
Pages |
885-887 |
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| Abstract |
Measurement of the Meissner penetration depth, λ(T) were made in amorphous Zr70Cu30 samples. The results indicate that this amorphous alloy behaves as a BCS superconductor with 2Δ(0)+45 degree rulekTc = 3.8, where Δ(0) is the superconducting energy gap at T=0 and Tc the critical temperature. It is also concluded that the low energy excitation, TLS, characteristics of amorphous material does not contribute to Tc. |
| Address |
Centro Atómico Bariloche – Instituto Balseiro |
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0038-1098 |
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no |
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BT @ pedrazp @ |
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532 |
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| Author |
de la Cruz, M.E.; Godfrin, E.J.P.; de la Cruz, F.; de Allende, C. |
| Title |
Superconducting intermediate state in cadmium |
Type |
Journal Article |
| Year |
1976 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
18 |
Issue |
6 |
Pages |
747-749 |
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Perpendicular magnetic critical fields for cadmium foils were measured to thicknesses below the temperature dependent coherence length. The presence of supercooling indicates first-order thermodynamic transitions for all samples. A modification of Davies' model leads to a good fit of the experimental data. |
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0038-1098 |
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no |
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BT @ pedrazp @ |
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528 |
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| Author |
Arce, R.; de la Cruz, F.; Esquinazi, P. |
| Title |
Superconducting penetration depth in amorphous metals |
Type |
Journal Article |
| Year |
1981 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
38 |
Issue |
12 |
Pages |
1253-1255 |
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We show that temperature dependent penetration depth measurements can be used to characterize the superconductive behaviour of amorphous metals. |
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0038-1098 |
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no |
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BT @ pedrazp @ |
Serial |
557 |
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| Author |
Kim, J.; Haberkorn, N.; Gofryk, K.; Graf, M.J.; Ronning, F.; Sefat, A.S.; Movshovich, R.; Civale, L. |
| Title |
Superconducting properties in heavily overdoped Ba(Fe0.86Co0.14)2As2 single crystals |
Type |
Journal Article |
| Year |
2015 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
201 |
Issue |
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Pages |
20-24 |
| Keywords |
A. Iron arsenide superconductors; B. Upper critical field; C. Magnetic penetration depth; D. Vortex pinning |
| Abstract |
Abstract
We report the intrinsic superconducting parameters in a heavily overdoped Ba(Fe1−xCox)2As2 (x=0.14) single crystal and their influence in the resulting vortex dynamics. We find a bulk superconducting critical temperature of 9.8 K, magnetic penetration depth λab (0)=660±50 nm, coherence length ξab (0)=6.4±0.2 nm, and the upper critical field anisotropy γT→Tc≈3.7. The vortex phase diagram, in comparison with the optimally doped compound, presents a narrow collective creep regime. The intrinsic pinning energy plays an important role in the resulting vortex dynamics as compared with similar pinning landscape and comparable intrinsic thermal fluctuations. |
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0038-1098 |
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no |
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BT @ pedrazp @ |
Serial |
724 |
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| Author |
Huber, J.G.; Bulman, J.B.; Sereni, J.G. |
| Title |
Superconductivity under pressure and low temperature specific heat of ThPr alloys |
Type |
Journal Article |
| Year |
1982 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
43 |
Issue |
12 |
Pages |
925-931 |
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| Abstract |
Measurements of superconducting transition temperature under pressure and low temperature specific heat are presented for ThPr alloys. At 18.2 kbar the normal- to superconducting-state phase boundary extends beyond 50 at.% Pr. This system is discussed in terms of a non-magnetic singlet ground state for the Pr3+ ions due to crystal field splitting. A splitting scheme which varies with Pr concentration is proposed. |
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0038-1098 |
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ISI:A1982PG48200012 |
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no |
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BT @ hernan @ |
Serial |
134 |
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| Author |
Arce, R.; Civale, L.; Luzuriaga, J.; Guimpel, J.; de la Cruz, F. |
| Title |
Surface normal regions in superconducting Zr70Cu30 induced by thermal relaxation |
Type |
Journal Article |
| Year |
1983 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
48 |
Issue |
12 |
Pages |
1027-1030 |
| Keywords |
ZIRCONIUM COPPER ALLOYS – Physical Properties; SUPERCONDUCTING MATERIALS |
| Abstract |
Penetration depth measurements show that thermal heat treatment in amorphous Zr70Cu30 induces a normal region 5000 Å thick at the surface of ultrarapid quenched ribbons. Upper critical field measurements indicate that the new induced phase is a normal one while the rest of the sample remains as a homogeneous superconducting phase. |
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Centro Atómico Bariloche – Instituto Balseiro |
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00381098 (ISSN) |
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Export Date: 28 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Arce, R.; Centro At |
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BT @ luzuriag @ |
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502 |
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