| Records |
| Author |
Durán, C.; Esquinazi, P.; Fainstein, C.; Núñez Regueiro, M. |
| Title |
Anomalies in the internal friction and sound velocity in YBa2Cu3O7-x and EuBa2Cu3O7-x superconductors |
Type |
Journal Article |
| Year |
1988 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
65 |
Issue |
9 |
Pages |
957-961 |
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| Abstract |
Internal friction Q-1 and Young Modulus sound velocity vE measurements at 1 kHz in YBa2Cu3O7?x and EuBa2Cu3O7?x polycrystalline samples reveal anomalies at the superconducting transition and at not, vert, similar37 K. The anomaly in vE at not, vert, similar90 K is accompanied by an absorption peak and is in agreement with published ultrasonic measurements, suggesting a lattice deformation at the superconducting transition. |
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| ISSN |
0038-1098 |
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no |
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BT @ pedrazp @ |
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569 |
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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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BT @ pedrazp @ |
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724 |
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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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no |
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BT @ pedrazp @ |
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729 |
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Giriat, G.; Ren, Z.; Pedrazzini, P.; Jaccard, D. |
| Title |
High pressure investigation of superconducting signatures in CeCu2Si2: ac-magnetic susceptibility, ac-heat capacity, resistivity and thermopower |
Type |
Journal Article |
| Year |
2015 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
209–210 |
Issue |
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Pages |
55-58 |
| Keywords |
CeCu2Si2; Superconductivity; Magnetic susceptibility; High pressure |
| Abstract |
Taking advantage of a novel multiprobe setup we have measured, on a unique sample, the ac-magnetic susceptibility, the resistivity, the ac-specific heat and the thermopower of the superconductor heavy fermion CeCu2Si2 under pressure up to 5.1 GPa. At the superconducting transition temperature Tc, the Meissner signal corresponds to that expected for the sample volume and coincides with the specific heat jump and the resistive transition completion temperatures. Differing from previous observations, here the susceptibility measurements did not reveal any anomaly in the vicinity of the resistive transition onset. |
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0038-1098 |
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no |
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BT @ pedrazp @ |
Serial |
720 |
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| Author |
Esparza, D.A.; D'Ovidio, C.A.; Guimpel, J.; Osquiguil, E.; Civale, L.; de la Cruz, F. |
| Title |
The granular nature of bulk superconductivity at 40K in La1.8Sr0.2CuO4 |
Type |
Journal Article |
| Year |
1987 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
63 |
Issue |
2 |
Pages |
137-140 |
| Keywords |
CERAMIC MATERIALS; GRANULAR MATERIALS; LANTHANUM COMPOUNDS – Electric Conductivity; CRITICAL FIELDS; HIGH TEMPERATURE SUPERCONDUCTOR; MAGNETIC FLUX EXPULSION; TEMPERATURE DEPENDENCE; SUPERCONDUCTING MATERIALS |
| Abstract |
We have measured the electrical resistivity, magnetic flux expulsion and critical fields of the new high temperature superconductor La1.8Sr0.2CuO4 after different heat treatments. Our data show that the complete flux expulsion in these samples is consistent with the presence of shielding currents induced in multiple connected structures. The magnetization measurements indicate that the lowest field where flux penetrates into the sample should not be taken to be the bulk Hcl. It is shown that the absolute value of the electrical resistivity and its temperature dependence are not correlated with the superconducting critical field and temperature. We discuss the behaviour of the superconducting parameters and their relation with the electrical resistivity. |
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Basic Research Department, Centro At |
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00381098 (ISSN) |
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Export Date: 17 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Esparza, D.A.; Applied Research Department; Centro At |
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no |
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BT @ osquigui @ |
Serial |
418 |
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| Author |
Osquiguil, E.; Decca, R.; Nieva, G.; Civale, L.; de la Cruz, F. |
| Title |
La1.80 Sr0.20 CuO4-delta a clean limit superconductor |
Type |
Journal Article |
| Year |
1988 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
65 |
Issue |
6 |
Pages |
491-494 |
| Keywords |
CERAMIC MATERIALS; LANTHANUM COMPOUNDS – Electric Conductivity; CERAMIC SUPERCONDUCTORS; CLEAN LIMIT SUPERCONDUCTOR; HIGH-TEMPERATURE SUPERCONDUCTORS; OXYGEN CONCENTRATION; SUPERCONDUCTING MATERIALS |
| Abstract |
The electrical resistivity of the superconductor La1.80Sr0.20Cu04-? has been measured in a wide range of temperatures as a function of oxygen and vacuum heat treatments. The resistivity changes reversibly orders of magnitude with oxygen concentration. There is no sign of saturation at high temperatures, even for samples where the resistivity is increased by heat treatment in vacuum. Using the experimental data and general arguments it is concluded that the ceramic superconductors are high ? materials in the clean limit. |
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Instituto Balseiro 8400 Bariloche, R.N., Argentina# # Comisi |
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00381098 (ISSN) |
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Export Date: 17 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Osquiguil, E. |
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BT @ osquigui @ |
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416 |
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Decca, R.; Osquiguil, E.; de la Cruz, F.; D'Ovidio, C.; Malachevski, M.T.; Esparza, D. |
| Title |
Non linear temperature dependence of the resistivity of LaSrCuO: Effects of Sr content |
Type |
Journal Article |
| Year |
1989 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
69 |
Issue |
4 |
Pages |
355-357 |
| Keywords |
Ceramic Materials; Lanthanum Compounds--Electric Conductivity; Superconductivity; Ceramic Superconductors; Superconducting Materials |
| Abstract |
The linear temperature dependence of the electrical resistivity has been taken to be one of the characteristic features of the ceramic superconductors. Measurements of the electrical resistance of the LaSrCuO system in a wide temperature range show that the previous statement is only an approximation valid for some values of the Sr concentration. |
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Applied Research Department, Centro At'omico Bariloche |
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00381098 (ISSN) |
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Cited By (since 1996): 2; Export Date: 17 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Decca, R.; Basic Research Department; Centro At |
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no |
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BT @ osquigui @ |
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414 |
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Rodriguez, E.; Luzuriaga, J.; Núñez Regueiro, M.; Fainstein, C. |
| Title |
Low temperature internal friction peak in high Tc superconductors |
Type |
Journal Article |
| Year |
1991 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
77 |
Issue |
10 |
Pages |
777-780 |
| Keywords |
Ceramic Materials; Oxides – Acoustic Properties; Yttrium Compounds – Acoustic Properties; Acoustic Variables Measurement; Attenuation Peak; Calcium Compounds; Low Temperature Internal Friction Peak; Strontium Compounds; Thermally Activated Relaxation Behavior; High Temperature Superconductors |
| Abstract |
We measure the internal friction Q-1 in YBa2Cu3O7-x and Bi2Sr2CaCu2O8+x samples. At temperatures near 35 K for KHz frequencies we observe an attenuation peak. In the case of YBa2Cu3O7-x, assuming a thermally activated relaxation behaviour, we are able to show that it corresponds to the same process as other peaks observed at higher frequencies. For Bi2Sr2CaCu2O8+x this is not the case, and the origin of the peak, found in all the measured samples, remains unknown. |
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0038-1098 |
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ISI:A1991FA71400006 |
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BT @ hernan @ |
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256 |
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Seyfarth, G.; Jaccard, D.; Pedrazzini, P.; Krzton-Maziopa, A.; Pomjakushina, E.; Conder, K.; Shermadini, Z. |
| Title |
Pressure cycle of superconducting Cs0.8Fe2Se2 : A transport study |
Type |
Journal Article |
| Year |
2011 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
151 |
Issue |
10 |
Pages |
747-750 |
| Keywords |
Fe; Se; chalcogenides; Superconductivity; High pressure; electrical resistivity |
| Abstract |
We report measurements of the temperature and pressure dependence of the electrical resistivity (Ï) of single-crystalline iron-based chalcogenide Cs0.8Fe2Se2. In this material, superconductivity with a transition temperature Tc~30K source develops from a normal state with extremely large resistivity. At ambient pressure, a large “hump†in the resistivity is observed around 200 K. Under pressure, the resistivity decreases by two orders of magnitude, concomitant with a sudden Tc suppression around pc~30K. Even at 9 GPa a metallic resistivity state is not recovered, and the Ï(T) “hump†is still detected. A comparison of the data measured upon increasing and decreasing the external pressure leads us to suggest that the superconductivity is not related to this hump. |
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BT @ pedrazp @ |
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604 |
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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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BT @ pedrazp @ |
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859 |
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