Scaling Behavior Near Superconducting Transition in the YBa2Cu3O7 System

1992 ◽  
Vol 275 ◽  
Author(s):  
M. K. Wu ◽  
M. J. Wang ◽  
Y. C. Chen ◽  
T. R. Chien ◽  
C. C. Chi ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase Transition ◽  
Power Law ◽  
Systematic Study ◽  
Sample Thickness ◽  
Scaling Behavior ◽  
Transition Model ◽  
Superconducting Transition ◽  
Flux Motion ◽  
Random Disorder

ABSTRACTWe have carried out a systematic study of the detailed I-V characteristic in magnetic fields of the YBa2Cu3O7 (YBCO) single crystals and c-axis oriented thin films. For all the samples studied, there exists a temperature at which the I-V satisfies simple power law. The I-V characteristic also follows the scaling behavior predicted by the phase transition model based on the random disorder. The derived critical exponents suggest the occurrence of 3D to 2D crossover of the flux motion. The critical field at which the crossover occurs depends on the sample thickness.

Multi-dimensional complex phase transition model by catastrophe theory developing Kolmogorov turbulence theory

2020 ◽  
Vol 34 (15) ◽  
pp. 2050159
Author(s):  
Zhuo Zhou ◽  
Jiu Hui Wu ◽  
Xiao Liang ◽  
Mei Lin ◽  
Xiao Yang Yuan ◽  
...  
Keyword(s):  
Phase Transition ◽  
Power Law ◽  
Catastrophe Theory ◽  
Equilibrium Phase ◽  
Turbulence Theory ◽  
Wave Number ◽  
Transition Model ◽  
Kolmogorov Turbulence ◽  
Equilibrium Phase Transition ◽  
Non Equilibrium

In this paper, a novel multi-dimensional complex non-equilibrium phase transition model is put forward to describe quantitatively the physical development process of turbulence and develop the Kolmogorov turbulence theory from the catastrophe theory, in which the well-known −5/3 power law is only a special case in this paper proving the accuracy of our methods. Catastrophe theory is a highly generalized mathematical tool that summarizes the laws of non-equilibrium phase transition. Every control variable in catastrophe theory could be skillfully expanded into multi-parameter multiplication with different indices and the relationship among these characteristic indices can be determined by dimensionless analysis. Thus, the state variables can be expressed quantitatively with multiple parameters, and the multi-dimensional non-equilibrium phase transition theory is established. As an example, by adopting the folding catastrophe model, we strictly derive out the quantitative relationship between energy and wave number with respect to a new scale index [Formula: see text] to quantitative study the whole process of the laminar flow to turbulence, in which [Formula: see text] varies from [Formula: see text] to [Formula: see text] corresponding to energy containing range and [Formula: see text] to energy containing scale where [Formula: see text] power law is deduced, and at [Formula: see text] the [Formula: see text] law of Kolmogorov turbulence theory is obtained, and fully developed turbulence phase starts at [Formula: see text] giving [Formula: see text] law. Furthermore, this theory presented is verified by our wind tunnel experiments. This novel non-equilibrium phase transition methods cannot only provide a new insight into the turbulence model, but also be applied to other non-equilibrium phase transitions.

Power-law scaling behavior in Barkhausen avalanches of ferromagnetic thin films

2007 ◽  
Vol 310 (2) ◽  
pp. 2599-2603 ◽  
Author(s):  
S.-C. Shin ◽  
K.-S. Ryu ◽  
D.-H. Kim ◽  
S.-B. Choe ◽  
H. Akinaga
Keyword(s):  
Thin Films ◽  
Power Law ◽  
Scaling Behavior ◽  
Ferromagnetic Thin Films

Observation by HVEM of the martensite transformation and the superconducting transition in Nb3Sn

1988 ◽  
Vol 46 ◽  
pp. 788-789
Author(s):  
M. A. Kirk ◽  
M. C. Baker ◽  
B. J. Kestel ◽  
H. W. Weber
Keyword(s):  
Thin Films ◽  
Low Temperature ◽  
Superconducting State ◽  
Martensite Transformation ◽  
Sputter Deposition ◽  
Diffusion Reaction ◽  
Solute Diffusion ◽  
Superconducting Transition ◽  
Twin Boundaries ◽  
Martensite Structure

It is well known that a number of compound superconductors with the A15 structure undergo a martensite transformation when cooled to the superconducting state. Nb3Sn is one of those compounds that transforms, at least partially, from a cubic to tetragonal structure near 43 K. To our knowledge this transformation in Nb3Sn has not been studied by TEM. In fact, the only low temperature TEM study of an A15 material, V3Si, was performed by Goringe and Valdre over 20 years ago. They found the martensite structure in some foil areas at temperatures between 11 and 29 K, accompanied by faults that consisted of coherent twin boundaries on {110} planes. In pursuing our studies of irradiation defects in superconductors, we are the first to observe by TEM a similar martensite structure in Nb3Sn.Samples of Nb3Sn suitable for TEM studies have been produced by both a liquid solute diffusion reaction and by sputter deposition of thin films.

scholarly journals Modulating the phase transition temperature of giant magnetocaloric thin films by ion irradiation

2017 ◽  
Vol 1 (6) ◽  
Author(s):  
S. Cervera ◽  
M. Trassinelli ◽  
M. Marangolo ◽  
C. Carrétéro ◽  
V. Garcia ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Ion Irradiation

Strain Control of Phase Transition and Exchange Bias in Flexible Heusler Alloy Thin Films

2021 ◽  
Author(s):  
Yechao Ling ◽  
Yong Hu ◽  
Haobo Wang ◽  
Ben Niu ◽  
Jiawei Chen ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase Transition ◽  
Exchange Bias ◽  
Heusler Alloy ◽  
Strain Control

Amorphous-to-crystalline phase transition of (InTe)x(GeTe) thin films

2010 ◽  
Vol 108 (2) ◽  
pp. 024506 ◽  
Author(s):  
Ki-Ho Song ◽  
Seung-Cheol Beak ◽  
Hyun-Yong Lee
Keyword(s):  
Thin Films ◽  
Phase Transition ◽  
Crystalline Phase ◽  
Crystalline Phase Transition

scholarly journals Strain-stabilized superconductivity

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
J. P. Ruf ◽  
H. Paik ◽  
N. J. Schreiber ◽  
H. P. Nair ◽  
L. Miao ◽  
...  
Keyword(s):  
Thin Films ◽  
Materials Science ◽  
Condensed Matter ◽  
Quantum States ◽  
Low Energy ◽  
Superconducting Transition ◽  
Superconducting Properties ◽  
Detailed Understanding ◽  
Epitaxial Strain ◽  
Promising Strategy

AbstractSuperconductivity is among the most fascinating and well-studied quantum states of matter. Despite over 100 years of research, a detailed understanding of how features of the normal-state electronic structure determine superconducting properties has remained elusive. For instance, the ability to deterministically enhance the superconducting transition temperature by design, rather than by serendipity, has been a long sought-after goal in condensed matter physics and materials science, but achieving this objective may require new tools, techniques and approaches. Here, we report the transmutation of a normal metal into a superconductor through the application of epitaxial strain. We demonstrate that synthesizing RuO2 thin films on (110)-oriented TiO2 substrates enhances the density of states near the Fermi level, which stabilizes superconductivity under strain, and suggests that a promising strategy to create new transition-metal superconductors is to apply judiciously chosen anisotropic strains that redistribute carriers within the low-energy manifold of d orbitals.

Orientation control of phase transition and ferroelectricity in Al-doped HfO2 thin films

2021 ◽  
pp. 111114
Author(s):  
Hei Man Yau ◽  
Xinxin Chen ◽  
Chi Man Wong ◽  
Deyang Chen ◽  
Jiyan Dai
Keyword(s):  
Thin Films ◽  
Phase Transition ◽  
Orientation Control

Cr doping-induced structural phase transition, optical tuning and magnetic enhancement in BiFeO3 thin films

2017 ◽  
Vol 186 ◽  
pp. 198-201 ◽  
Author(s):  
Benlong Guo ◽  
Hongmei Deng ◽  
Xuezhen Zhai ◽  
Wenliang Zhou ◽  
Xiankuan Meng ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase Transition ◽  
Structural Phase Transition ◽  
Structural Phase ◽  
Bifeo3 Thin Films ◽  
Magnetic Enhancement ◽  
Cr Doping
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