Granular superconductivity and phase separation in Ru1212Eu

Y. Y. Xue; B. Lorenz; A. Baikalov; J. Cmaidaka; F. Chen; R. L. Meng; C. W. Chu

doi:10.1016/j.physc.2004.03.090

Granular superconductivity and phase separation in Ru1212Eu

Y. Y. Xue, B. Lorenz, A. Baikalov, J. Cmaidaka, F. Chen, R. L. Meng, C. W. Chu

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Abstract

The magnetic and superconducting properties of RuSr₂EuCu ₂O_10+δ (Ru1212Eu) are investigated. Analysis of the magnetization and specific heat suggest that the ferromagnetic and antiferromagnetic transitions in this component are separated by Cu-doping, and that both carry comparable spin entropies. This is more in line with mesoscopic phase-separation than cant antiferromagnetism. The equilibrium magnetization was further deduced as the function of both the external field H₂ and the demagnetizing field H_dm. The data show that the FM component is along the a, b direction with a maximum H_dm far larger than the apparent lower-critical-field observed. Part of the samples, therefore, should be in the spontaneous vortex state if the magnetic domains are pre-aligned above T_c.

Original language	English
Pages (from-to)	638-640
Number of pages	3
Journal	Physica C: Superconductivity and its applications
Volume	408-410
Issue number	1-4
DOIs	https://doi.org/10.1016/j.physc.2004.03.090
Publication status	Published - 2004 Aug
Event	Proceedings of the International Conference on Materials - Rio de Janeiro, Brazil Duration: 2003 May 25 → 2003 May 30

All Science Journal Classification (ASJC) codes

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

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10.1016/j.physc.2004.03.090

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@article{92628d35c30247e0b5c67ca190942cc3,

title = "Granular superconductivity and phase separation in Ru1212Eu",

abstract = "The magnetic and superconducting properties of RuSr2EuCu 2O10+δ (Ru1212Eu) are investigated. Analysis of the magnetization and specific heat suggest that the ferromagnetic and antiferromagnetic transitions in this component are separated by Cu-doping, and that both carry comparable spin entropies. This is more in line with mesoscopic phase-separation than cant antiferromagnetism. The equilibrium magnetization was further deduced as the function of both the external field H2 and the demagnetizing field Hdm. The data show that the FM component is along the a, b direction with a maximum Hdm far larger than the apparent lower-critical-field observed. Part of the samples, therefore, should be in the spontaneous vortex state if the magnetic domains are pre-aligned above Tc.",

author = "Xue, {Y. Y.} and B. Lorenz and A. Baikalov and J. Cmaidaka and F. Chen and Meng, {R. L.} and Chu, {C. W.}",

note = "Funding Information: This work is supported in part by the National Science Foundation, the T.L.L. Temple Foundation, the John and Rebecca Moores Endowment and the State of Texas through TCSUH, and at LBNL by the US Department of Energy.; Proceedings of the International Conference on Materials ; Conference date: 25-05-2003 Through 30-05-2003",

year = "2004",

month = aug,

doi = "10.1016/j.physc.2004.03.090",

language = "English",

volume = "408-410",

pages = "638--640",

journal = "Physica C: Superconductivity and its applications",

issn = "0921-4534",

publisher = "Elsevier",

number = "1-4",

}

TY - JOUR

T1 - Granular superconductivity and phase separation in Ru1212Eu

AU - Xue, Y. Y.

AU - Lorenz, B.

AU - Baikalov, A.

AU - Cmaidaka, J.

AU - Chen, F.

AU - Meng, R. L.

AU - Chu, C. W.

N1 - Funding Information: This work is supported in part by the National Science Foundation, the T.L.L. Temple Foundation, the John and Rebecca Moores Endowment and the State of Texas through TCSUH, and at LBNL by the US Department of Energy.

PY - 2004/8

Y1 - 2004/8

N2 - The magnetic and superconducting properties of RuSr2EuCu 2O10+δ (Ru1212Eu) are investigated. Analysis of the magnetization and specific heat suggest that the ferromagnetic and antiferromagnetic transitions in this component are separated by Cu-doping, and that both carry comparable spin entropies. This is more in line with mesoscopic phase-separation than cant antiferromagnetism. The equilibrium magnetization was further deduced as the function of both the external field H2 and the demagnetizing field Hdm. The data show that the FM component is along the a, b direction with a maximum Hdm far larger than the apparent lower-critical-field observed. Part of the samples, therefore, should be in the spontaneous vortex state if the magnetic domains are pre-aligned above Tc.

AB - The magnetic and superconducting properties of RuSr2EuCu 2O10+δ (Ru1212Eu) are investigated. Analysis of the magnetization and specific heat suggest that the ferromagnetic and antiferromagnetic transitions in this component are separated by Cu-doping, and that both carry comparable spin entropies. This is more in line with mesoscopic phase-separation than cant antiferromagnetism. The equilibrium magnetization was further deduced as the function of both the external field H2 and the demagnetizing field Hdm. The data show that the FM component is along the a, b direction with a maximum Hdm far larger than the apparent lower-critical-field observed. Part of the samples, therefore, should be in the spontaneous vortex state if the magnetic domains are pre-aligned above Tc.

UR - http://www.scopus.com/inward/record.url?scp=4344633673&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=4344633673&partnerID=8YFLogxK

U2 - 10.1016/j.physc.2004.03.090

DO - 10.1016/j.physc.2004.03.090

M3 - Conference article

AN - SCOPUS:4344633673

SN - 0921-4534

VL - 408-410

SP - 638

EP - 640

JO - Physica C: Superconductivity and its applications

JF - Physica C: Superconductivity and its applications

IS - 1-4

T2 - Proceedings of the International Conference on Materials

Y2 - 25 May 2003 through 30 May 2003

ER -

Granular superconductivity and phase separation in Ru1212Eu

Abstract

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