Symposium A-3:Session Pinning IV , August 29th


Invited talk given by Alexey V Pan from Institute for Superconducting and Electronic Materials, University of Wollongong.

The first part of the talk was about magnetic measurements performed with a VSM system where it could be observed that the Jc performance of a superconducting sample was strongly dependent on the measurement frequency.
The second part talk was about the design of different microstructures (with many different shape, distribution and sizes) patterned on superconducting films. Samples were mainly characterized by means of magnetic measurements and magneto-optical imaging. Nice correlation of superconducting properties could be obtained depending on the patterning performed. Ratchet effects were studied in samples with asymmetric patterns. Both theoretical calculations and measurements show differences in the critical current density when inverting the direction of the current.


Invited talk given by Petriina Paturi from Wihuri Physical Laboratory, University of Turku.
The talk was about theoretical calculation of flux pinning effects in YBCO thin films with artificial pinning sites (nano-rods, nano-particles).
The first part of the talk was about simulations of angular Jc measurements performed on samples with different artificial pinning centre landscape. The samples were grown alternating layers of different thicknesses with rods and plane YBCO in order to change the length of nanorods. Experimental angular Jc measurements show that long nano-rods produce strong c-axis peak while short nano-rods could not. The simulations performed could nicely explain the experimental data.
The second part of the talk was about the analysis of alpha values and pinning force curves in YBCO samples with different nano-structures, correlating the experimental results with simulations.


Oral talk given by Gianluca de Marzi from ENEA C. R. Frascati, Technical Unit for Nuclear Fusion-FSN (Rome), Italy
The talk was about ac measurements on YBCO thin films with BNTO and BNTO+YO nanoparticles. The activation energy of different samples was evaluated from ac susceptibility measurements performed at different frequency and different conditions of ac and dc magnetic field. From those measurements the activation energy as a function of the magnetic field and critical current density could be obtained and correlated with the critical current density performance of different samples.

* The session finished 15 minutes late since we had some technical problems with the projection of the last talk and we had to change the computer.

Symposium A-3:Session Pinning III , August 29th

-Talk 1 A3-129-005 by G. Celentano (invited)

PLD YBCO thin films with improved pinning by doping tamtalates and niobates (BaYTaO6 and BYNnO6) in extended temperature and high H field via double perovskite (sponsored  by Euro tapes and Euro fusion programs)

Several doping schemes of single and double APCs were explored and the superconducting properties, especially Jc were compared.

For example, three specific schemes were compared:

  1. BYTO at 5 at%, d=8nm), 1D(5nm, H*~5.2 T) +2D(stacking faults?)
  2. 5at%+BYTO2.5at% (d=8nm), 1D(5nm, H*~5.2 T) +2D(stacking faults?)-best Jc-H in few-10T, still see both Jc peaks at both H//c, and ab
  3. 5at%+BYTO2.5at%+3.75at% Y2O3, 1D(10 nm, H*~1.9 T), many 3D

Also, varied the PLD repetition rates were explored: from 1Hz (12 nm, 1.1T) to 5Hz (7nm, H*~2T), to 10 Hz (5nm, 5.2 T)

-Talk 2 A3-129-006 by L. Civale for B. Bairov (invited)

Talk’s primary focus was on the Rho and Jc measurements in pulsed H field at LANL, which has facility that  can reach 65T up to 100 T ( as a part of the Nat. High Mag. Field Lab) in few to tens of ms time frame  in He4 and He3.  Measurement can be operated at fixed theta, pulsed H at different Ts, or fixed T, pulsed field at different theta’s

Measurement on iron-based supercond, two band model SUST 2014, 27 by Maiorov. Mele, et al and on the YBCO with DD (similar to the N Mat. Paper in 2011), BZO NPs in CSD film increases the B_irr significantly

-Talk 3 A3-129-007 by T. Izumi (invited)

Control in-field performance by modifying microstructure in cc, 1D, 2D and 3D APCs, morphologies depending on the process (PLD, MOD, MOCVD), conditions (T, PO2, composition)and materials of APCs.

In situ method PLD-1D APCs, while ex situ one CSD, 3D APCs of the same dopants (BZO)

Super saturation at the synthesis temperature leads to formation of  BZO NPs in CSD process. PLD multilayer growth to generate layered (2D) APCs in ab-plane (BHO) in BHO/GdBCO (Yoshida), by spinning thinner precursor (30 nm) vs old 170 nm, found smaller BZO NPs ~ 10-12nm, in contrast to 16 nm, radius of NP lambda=2D/V, V-growth velocity, D-diffusion speed.


Symposium B-4: Congratulations on winning the Langmuir Award and Soft Matter Award!!

In our symposium, active researchers in soft matter science have gotten together from all over the world (more than 10 countries) and have made active discussion of the up-to-date results on soft matter science. “Langmuir Award” and “Soft Matter Award” were provided to our symposium by courtesy of the ACS publications and Royal Society for Chemistry. The presentations made by young researchers were judged by the aid of invited speakers of our symposium and the symposium organizers have elected the five award winners. The winners are listed as below:

Langmuir Award

B4-P29-009 Yuki OHARA (University of Hyogo, Japan)

“Incorporation of and release behavior of guest molecules by pH-responsive polyion complex vesicles”

B4-P29-021 Ko MATSUKAWA (The University of Tokyo, Japan)

“Preparation of hydrogel which has comb-type polymer network only in the surface region”

Soft Matter Award

B4-O29-012 NienTing HSIEH (Chung Yuan Christian University, Taiwan)

“Molecular design of a dual-functional quaternary amine copolymer for bacterial reversible self-cleaning control via zwitterionic counterion activation”

B4-P29-003 Nozomi ARAI (Kyoto University, Japan)

“Direct observation and modeling of attachment behavior of colloid particles on a bubble surface”

B4-P29-005 Yoji YAMASHITA (Osaka City University, Japan)

“Synthesis of curable hyperbranched polymers containing dense degradable groups and their application to degradable cured materials”


Group photo of the B-4 Symposium.

Mr. Nozomi ARAI (Kyoto University), the winner of the Soft Matter Award


Report „Devices / Heavy Fermion II“ Aug. 29, second part

Kenji Ishida reported in his invited talk on NMR and NQR studies on U-based ferromagnetic superconductors. He showed that in UCoGe a spin triplett superconducting state is induced by fluctuations. This is a new mechanism to suppress superconductivity.

A collaboration of groups from Japan and a group of Vietnam develops a scanning LTS-SQUID vector microscope with three orthogonal pick-up loops on a tip cooled by a commercial GM cryocooler. The sensors were tested and high spatial resolution demonstrated.

The figure shows the pick-up loops (left) and a trapped vortex structure measured by the new SQUID vector sensors within a commercial SSM (right).

Report on A-3 sessions of August 29

Matsumoto: Interesting TDGL simulations of Jc and comparison to experiment. It is reported experimental Jc measurements on BHO doped GdBCO with different level of doping. Best pinning force density Fp at 10 K was achieved on 20:1 volume fraction. The analysis of temperature behavior Jc(T) with Griessen’s model is reported.

Questions: Is the simulation 3D? No. How many pinning sites can be added to the simulation? What is the meaning of the background pins at high field? Difference of delta-l and delta-Tc pinning? How is Jc determined in the simulation?

Yoshida: SmBCO + BaHfO3 coated conductors. Low-T growth technique (750 C vs 960 C) with seed layer (150 C less than without). Rods are thinner (7 nm vs 13.5 nm), B_phi is larger. High rate leads to small pinning sites (similarly as in previous presentations).

High speed growth technique in a reel-to-reel deposition systems up to 100 Hz. No degradation of Jc reported. No clear which is the actual film growth rate.

Questions: How are the inclination angles defined? What is the effect of strain in growth of nanocolumns? What is the Ic of the sample? (from patterned sample) What is the growth rate in “high growth rate”-films?

How is the substrate temp measured? 960 C is a lot! (didn’t ask this, because of lack of time)

Erbe: ReBCO + BHO on TFA-MOD on STO and CeO2-buffered CC. Re = Gd, higher Tc, should have wider deposition parameters. Result: Narrow process parameters, otherwise impurities (on STO). On STO optimal deposition conditions are: T = 810 °C and P(O2) 100 – 50 ppm. On metal optimal t_sub is 20 C lower (we’ve seen this also on PLD films) due to the reaction with CeO2 seed layer (BaCeO3 forms). Pores in films on meta.

Questions: What about the in-plane texture? Good in-plane texture. Optimal temperature difference STO / CC. Thickness of the films: 250-300 nm.

Jha: Surface modified target approach to enhance Jc, Y211 dopant as segment of target. Nano dots formed into YBCO matrix. Jc measurements carried out at 77 and 65 K. Dip in the Jc(theta) near ab-plane. Otherwise almost isotropic. Theory from Mishec SUSt 28. Planar defects cause a dip in ab-planes. For further work doping with other rare earths RE211 phases will be studied.

Questions: Could this promote substitution of rare earth ion of dopant on superconductor? A: yes, but the final effect of this cannot be predicted in advance.

van der Beek: edge disorder and rough flux front. Flux noise in rf antennas. MO-visualization. Seen also in Nb. And in other elastic media (paper, ink on paper etc). Calculate correlations in space and time. Universality classes vary between different superconducting materials. Controlled disorder, irradiated with heavy ions.

Questions: How do the flux avalanches in MgB2 relate to this? Not really definite yet.

Plenary 3 : Topological Quasiparticles: Magnetic Skyrmions

Axel Hoffmann, Materials Science Division, Argonne National Laboratory

In his plenary lecture Axel Hoffmann discussed new magnetically ordered structures, which recently have gained much attention due to their potential for low-energy applications.  These magnetic structures are called magnetic skyrmions and this name is derived from the theoretical physicist Tony Skyrme, who originally developed in the 1960’s a theoretical model describing nuclear particles as topological solitons within a vector field.  But similar structures can also form in magnetically ordered materials.  Interestingly, due to their distinct topology these magnetic skyrmions can behave like individual stable particles.

They were first discovered about a decade ago in special magnetic materials at low temperatures, but the work from Axel Hoffmann and his colleagues showed that they can be also stabilized at room temperature in magnetic multilayers of materials that are commonly used for magnetoelectronic applications.  At the same time these magnetic skyrmions can be easily manipulated with even very low electric currents, which makes them of interest for data storage and processing applications.

During his presentation Axel Hoffmann also showed two interesting basic physics concepts.  First he showed that magnetic skyrmions can be formed by using inhomogeneous electric currents.  This process is strikingly similar to common phenomena in surface tension driven fluid flows, such as the formation of soap bubbles by blowing through a suspended soap film.  Second he showed that the twirling magnetic structure of magnetic skyrmions results in “curved” trajectories.  The physics behind this skyrmion Hall effect is very similar to the motion of curveball in baseball or soccer, where the rotation of the ball results in a change of trajectory to confuse the batter or goalkeeper.  This shows that the investigation of magnetic skyrmions is not only fascinating because of their prospect for novel applications, but that their distinct topology also provides new interesting fundamental physical phenomena.

Axel Hoffmann always gives very interesting and valuable presentations, and his lighthearted approach, makes his talks very engaging.  Thus his Plenary Talk offered both an academic and peaceful atmosphere to audience.  As part of his Talk he presented a brief video showing how the Brazilian soccer player Roberto Carlos used a curved ball to leave the French goalkeeper confused.  This gave the audience an easy understanding for difficult physics delivered with humor.  But of course the question arises, whether “the twirling magnetic structure of magnetic skyrmions moving on curved trajectories” confused anybody?  Fortunately Axel Hoffmann addressed any remaining confusion well during the questions and answers.

PL.2 Helical Polymers as Unique Chiral Materials Professor Eiji Yashima (Nagoya University, Japan)

The helix is ubiquitous in nature, and one of the prevalent structural motifs for biological polymers, playing key roles in their sophisticated functions. Professor Yashima showed unique polymers consisting of preferred-handed helical conformation induced by chiral dopants.  Generally, the polymer lost preferred-handed helical structure when the chiral dopant was removed from the system.  He showed novel helical polymer which remain the preferred-handed helical structure even after removal chiral dopant using specific poly acetylene with well-established side chains.  This memory effect can be utilized for production of separation materials for chiral chemicals and drugs.

Prof. Yashima summarized helicity induction and memory strategy which has a remarkable advantage from a practical viewpoint.  Various examples on the direct observations of helical structures of synthetic helical polymers by atomic force microscopy (AFM) was presented. A series of double and/or multi helices composed of different components and sequences that exhibit specific functions, such as chiral recognition and anisotropic spring-like motion was also introduced with very impressive images.


Session C-2 Aug.29

This is the second day of C-2 session in IUMRS-ICAM2017. A first paper in the morning was cancelled. Since more than 30 audiences were waiting in the room, Prof. Bruno Ameduri (CNRS) volunteered to entertain these audiences by his magic show. Prof. Bruno Ameduri is a famous chemist in the area of fluoropolymers and is also well known as CliniClown visiting sick children in hospitals of Montpellier and abroad. He showed the difference in molecular weight synthesized by free radical polymerization and controlled radical polymerization through the length change of three different ropes by his magic! All audiences understand the concept of molecular weight distribution of polymer.

Science magic by Prof. Bruno Ameduri




In the morning session, we had one contributed paper and two invited papers on stimuli responsive nanogel and polymer gel thin film were presented.  In the afternoon session, five contributed papers and five invited papers were presented.  Control of nanoparticle surface for various composite applications, structure-property relationships of novel polymer nanocomposites, and surface structure and properties of polymer ultrathin films were presented.  We have more than 50 participants and active discussion was continued until the end of the day.

Symposium A-5 : Session OXIDES I / Aug. 29

Since an expected room change happened, the session delayed by 15 min. Except for this, the session went well successfully with forty audience.

The keynote  speaker Dr. Ryoji Funahashi presented his recent activities on new-type

thermoelectric power generators that would be able to compete costwise with other forms of power generators in future.

The second speaker Dr. Shanchela determined the effective mass of the recently developed transparent conductor BaSnO3 to be 0.4m_0.

Symposium:B-6 Aug.29

Advances in Functions and Reliability of Ceramics and Glasses Based on Structural Formation

Solid oxide fuel cell, environmental purification filters, wind power generation and solar cells are promising advanced systems to make a contribution to energy and environmental issues. In these systems, advanced ceramics and glasses are quite important as key materials, and further improvement of the materials functions and reliability is needed. This session was planned to discuss various possibilities for the sudden rise in advanced ceramics and glasses extensively from the viewpoint of structural formation.

This session was held from Aug. 28(MON) to Aug. 30(WED), 2017, in Kyoto Univ. and had 10 invited talks, 13 oral presentations, and 24 poster presentations. The speakers came from China, Taiwan, Korea, Thailand,Mexico and Japan. There were 20 or more attendees gave enthusiastic discussion for each oral presentation from various point of view (Fig.1). Especially, on the 2nd day, Prof. Soo Wohn Lee, President of IUMRS participated this session all day and gave his comments to many presentations (Fig.2).

To advance our friendship between the speakers in this session, we went for dinner as the session banquet in the evening of the 2nd day. We enjoyed Japanese Sake and fish Hamo (Conger myriaster) in a traditional restaurant, and have a good time to know each other. We promised to meet again in the next conference when we went back our accommodations.

Finally, all the organizers greatly expressed their gratitude to all speakers of this session, and also organizing committees of IUMRS-ICAM2017.


Fig.1 Group Photo of B-6 session after the 1st day.

Fig.2 Group Photo of B-6 session after the 2nd day.