Evolution of vortex dynamics in YBa2Cu3O7 films with nanorods by adding nanoparticles

L. Miu, Paolo Mele, A. Crisan, A. Ionescu, D. Miu

研究成果: Article

3 引用 (Scopus)

抄録

Vortex excitations and creep regimes in YBa2Cu3O 7 (YBCO) films with nonsuperconducting nanorods (columnar defects) and/or nanoparticles in a low external magnetic field H oriented perpendicular to the film surface have been identified using standard DC magnetization relaxation measurements. It was found that by increasing the pinning energy dispersion through nanoparticle addition the relevant changes in the temperature T variation of the normalized magnetization relaxation rate S appear at relatively high temperatures (T ∼ 65 K for H = 2 kOe), owing to the inhibition of double vortex-kink formation. This indicates that the often observed S(T) maximum at low T (around 30 K) is not related to the excitation of double vortex kinks and super-kinks in specimens with columnar defects, as previously believed. The low-T S(T) maximum is present in the case of strongly pinned specimens without nanorods, as well, and depends on the film thickness, which definitely shows that it is caused by thermo-magnetic instabilities, as recently suggested.

元の言語English
ページ(範囲)40-43
ページ数4
ジャーナルPhysica C: Superconductivity and its Applications
500
DOI
出版物ステータスPublished - 2014 5 15
外部発表Yes

Fingerprint

Nanorods
nanorods
Vortex flow
vortices
Nanoparticles
nanoparticles
Magnetization
magnetization
Defects
defects
excitation
Film thickness
Creep
film thickness
direct current
Magnetic fields
Temperature
magnetic fields
barium copper yttrium oxide
temperature

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

これを引用

Evolution of vortex dynamics in YBa2Cu3O7 films with nanorods by adding nanoparticles. / Miu, L.; Mele, Paolo; Crisan, A.; Ionescu, A.; Miu, D.

:: Physica C: Superconductivity and its Applications, 巻 500, 15.05.2014, p. 40-43.

研究成果: Article

@article{54ecc01a3f064ca0b1fd4af1a533acbe,
title = "Evolution of vortex dynamics in YBa2Cu3O7 films with nanorods by adding nanoparticles",
abstract = "Vortex excitations and creep regimes in YBa2Cu3O 7 (YBCO) films with nonsuperconducting nanorods (columnar defects) and/or nanoparticles in a low external magnetic field H oriented perpendicular to the film surface have been identified using standard DC magnetization relaxation measurements. It was found that by increasing the pinning energy dispersion through nanoparticle addition the relevant changes in the temperature T variation of the normalized magnetization relaxation rate S appear at relatively high temperatures (T ∼ 65 K for H = 2 kOe), owing to the inhibition of double vortex-kink formation. This indicates that the often observed S(T) maximum at low T (around 30 K) is not related to the excitation of double vortex kinks and super-kinks in specimens with columnar defects, as previously believed. The low-T S(T) maximum is present in the case of strongly pinned specimens without nanorods, as well, and depends on the film thickness, which definitely shows that it is caused by thermo-magnetic instabilities, as recently suggested.",
keywords = "Magnetization relaxation, Nonsuperconducting nanorods and nanoparticles, Vortex excitations and creep regimes",
author = "L. Miu and Paolo Mele and A. Crisan and A. Ionescu and D. Miu",
year = "2014",
month = "5",
day = "15",
doi = "10.1016/j.physc.2014.03.002",
language = "English",
volume = "500",
pages = "40--43",
journal = "Physica C: Superconductivity and its Applications",
issn = "0921-4534",
publisher = "Elsevier",

}

TY - JOUR

T1 - Evolution of vortex dynamics in YBa2Cu3O7 films with nanorods by adding nanoparticles

AU - Miu, L.

AU - Mele, Paolo

AU - Crisan, A.

AU - Ionescu, A.

AU - Miu, D.

PY - 2014/5/15

Y1 - 2014/5/15

N2 - Vortex excitations and creep regimes in YBa2Cu3O 7 (YBCO) films with nonsuperconducting nanorods (columnar defects) and/or nanoparticles in a low external magnetic field H oriented perpendicular to the film surface have been identified using standard DC magnetization relaxation measurements. It was found that by increasing the pinning energy dispersion through nanoparticle addition the relevant changes in the temperature T variation of the normalized magnetization relaxation rate S appear at relatively high temperatures (T ∼ 65 K for H = 2 kOe), owing to the inhibition of double vortex-kink formation. This indicates that the often observed S(T) maximum at low T (around 30 K) is not related to the excitation of double vortex kinks and super-kinks in specimens with columnar defects, as previously believed. The low-T S(T) maximum is present in the case of strongly pinned specimens without nanorods, as well, and depends on the film thickness, which definitely shows that it is caused by thermo-magnetic instabilities, as recently suggested.

AB - Vortex excitations and creep regimes in YBa2Cu3O 7 (YBCO) films with nonsuperconducting nanorods (columnar defects) and/or nanoparticles in a low external magnetic field H oriented perpendicular to the film surface have been identified using standard DC magnetization relaxation measurements. It was found that by increasing the pinning energy dispersion through nanoparticle addition the relevant changes in the temperature T variation of the normalized magnetization relaxation rate S appear at relatively high temperatures (T ∼ 65 K for H = 2 kOe), owing to the inhibition of double vortex-kink formation. This indicates that the often observed S(T) maximum at low T (around 30 K) is not related to the excitation of double vortex kinks and super-kinks in specimens with columnar defects, as previously believed. The low-T S(T) maximum is present in the case of strongly pinned specimens without nanorods, as well, and depends on the film thickness, which definitely shows that it is caused by thermo-magnetic instabilities, as recently suggested.

KW - Magnetization relaxation

KW - Nonsuperconducting nanorods and nanoparticles

KW - Vortex excitations and creep regimes

UR - http://www.scopus.com/inward/record.url?scp=84897394264&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84897394264&partnerID=8YFLogxK

U2 - 10.1016/j.physc.2014.03.002

DO - 10.1016/j.physc.2014.03.002

M3 - Article

AN - SCOPUS:84897394264

VL - 500

SP - 40

EP - 43

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

SN - 0921-4534

ER -