scholarly journals CONSIDERATIONS ON THE MAGNETIC FIELD PROBLEM IN SUPERCONDUCTING THIN FILMS

1964 ◽  
Author(s):  
Y. Nambu ◽  
S.F. Taun
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Superconducting Thin Films ◽  
Field Problem ◽  
The Magnetic Field

scholarly journals Quantum Griffiths singularities in TiO superconducting thin films with insulating normal states

2019 ◽  
Vol 11 (1) ◽  
Author(s):  
Chao Zhang ◽  
Yunjie Fan ◽  
Qiaoling Chen ◽  
Tianyi Wang ◽  
Xiang Liu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Critical Exponent ◽  
Direct Evidence ◽  
Critical Magnetic Field ◽  
Josephson Coupling ◽  
Superconducting Thin Films ◽  
Normal States ◽  
Rare Regions ◽  
The Magnetic Field

AbstractA superconductor–metal transition (SMT) with an unconventional diverging dynamic critical exponent was recently discovered, and it drew tremendous attention because this signature of a quantum Griffiths singularity (QGS) was thought to be a common characteristic of low-disorder crystalline superconductors. However, because the QGS was observed only in limited materials with metallic normal states, the question of whether the QGS exists in other superconducting systems is still unanswered. In this paper, a superconductor–insulator transition (SIT) is observed in TiO thin films with insulating normal states, which offers a more universal platform for investigating the QGS. A thickness-tuned SIT is obtained when the magnetic field is zero. Importantly, a magnetic field-tuned SIT with a diverging dynamic critical exponent, which is direct evidence of a QGS, is observed in TiO thin films with different thicknesses. By constructing a comprehensive phase diagram, it is demonstrated that the critical magnetic field Hc tends to saturate as the temperature approaches 0 K, which is different from the upturn trend of Hc observed in SMT systems and probably due to the weaker Josephson coupling of the locally ordered superconducting islands (rare regions) in a weakly insulating normal state background. The results extend the QGS scenario from only SMT systems to SIT systems, and they provide vital evidence that QGSs are common in crystalline superconducting thin films, which has possible applications in quantum-computing devices.

Magnetism of CoFe2O4 thin films annealed under the magnetic field

2015 ◽  
Vol 394 ◽  
pp. 287-291 ◽  
Author(s):  
Y.Q. Dai ◽  
J.M. Dai ◽  
X.W. Tang ◽  
Z.F. Zi ◽  
K.J. Zhang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
The Magnetic Field

The interphase surface energy in some pure and impure superconductors

1960 ◽  
Vol 255 (1282) ◽  
pp. 407-426 ◽  
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Surface Energy ◽  
Detailed Analysis ◽  
Energy Parameter ◽  
Transverse Magnetic ◽  
Superconducting Phase ◽  
Interphase Surface ◽  
Dilute Alloys ◽  
The Magnetic Field

A new method has been developed for obtaining relative values of the surface energy parameter, Δ, in superconductors. It involves the measurement of the resistance of thin films subjected to a transverse magnetic field. The method has been applied to tin, indium and aluminium and to dilute alloys of the first two. The principal new results are that Δ is 1⋅48 times larger in indium than in tin and that the addition of impurity to either metal lowers Δ without changing the nature of its temperature dependence. These conclusions are compared with current theories of the interphase surface energy. An attempt has been made to deduce the absolute magnitude of Δ, which requires a detailed analysis of the way in which the last traces of the superconducting phase are eliminated from the film by the action of the magnetic field. The analysis is necessarily over-simplified but it does give a figure for Δ in pure tin which is reasonably consistent with the previous estimates of Faber and Sharvin.

ANOMALOUS BEHAVIORS OF NON-RESONANT MICROWAVE ABSORPTIONS OF SUPERCONDUCTORS

2000 ◽  
Vol 14 (16) ◽  
pp. 1633-1650
Author(s):  
K. SUGAWARA ◽  
N. ARAI ◽  
A. KOUZUKI ◽  
S. ICHIMURA ◽  
H. NAOI ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Applied Magnetic Field ◽  
Microwave Power ◽  
Superconducting Thin Films ◽  
Modulation Amplitude ◽  
Directional Effect ◽  
System A ◽  
Powder Samples ◽  
Preliminary Study

The non-resonant microwave absorption (NRMA) measurements have been intensively performed for superconducting thin films of YBa 2 Cu 3 O y fabricated on MgO (100) substrates and powder samples of LaSrCuO systems. In order to complement the study, we also review the NRMA of BiSrCaCuO system. A particular attention has been paid to the following phenomena: (i) phases, (ii) effect of current, (iii) directional effect of applied magnetic field, (iv) hysteresis, (v) microwave power absorbed as a function of magnetic field, (vi) linewidth in the vicinity of T c , and (vii) modulation amplitude effect. A preliminary study on ( La 0.98 Dy 0.02)1.85 Sr 0.15 CuO 4 was also reported.

scholarly journals Influence of the magnetic field on bandgap and chemical composition of zinc thin films prepared by sparking discharge process

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Stefan Ručman ◽  
Panich Intra ◽  
E. Kantarak ◽  
W. Sroila ◽  
T. Kumpika ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Chemical Composition ◽  
Discharge Process ◽  
The Magnetic Field
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