Magnetism and superconductivity in RuM1.5Ce0.5Sr 2Cu2O10 (M = Eu and Y)

I. Felner; E. Galstyan; V. P.S. Awana; E. Takayama-Muromachi

doi:10.1016/j.physc.2004.02.069

Magnetism and superconductivity in RuM_1.5Ce_0.5Sr ₂Cu₂O₁₀ (M = Eu and Y)

I. Felner^*, E. Galstyan, V. P.S. Awana, E. Takayama-Muromachi

^*Corresponding author for this work

Racah Institute of Physics

Research output: Contribution to journal › Conference article › peer-review

9 Scopus citations

Abstract

RuY_1.5Ce_0.5Sr₂Cu₂O ₁₀, is not superconducting (SC) and orders magnetically at T _M = 152 K. The Ru moment at 5 K is 0.75μ_B. Ferromagnetic hysteresis loops are observed below T_irr = 100 K. At 100 K, the remanent magnetization (M_rem) and the coercive field (H_C) become zero. Surprisingly, at T_irr < T < T _M a reappearance of antiferromagnetic (AFM) hysteresis loops are observed with a peak at 120 K for both M_rem and H_C. The paramagnetic constants are: P_eff = 2.06μ_B (greater than the 1.73μ_B expected for low spin Ru⁵⁺) and θ = 136 K which agrees well with T_M. Substitution of Zn (2.5% atm.) for Cu in RuEu_1.5Ce_0.5 Sr₂Cu₂O ₁₀ (T_C = 38 K), suppresses T_C but does not affect the magnetic features such as: T_M and T_irr, M _rem and H_C. This indicates that both SC and magnetic states are practically decoupled. We argue that the magnetic structure of this system becomes (i) AFM ordered at T_M. (ii) Due to the tilting of the RuO₆ octahedra away from the crystallographic c-axis, at T _irr < T_M, weak-ferromagnetic (W-FM) order is induced by the canting of the Ru moments. (iii) At T_C (T_M/T _C ∼ 4), the specific materials (M = Eu, Gd) become SC. Below T_C, both SC and W-FM states coexist.

Original language	English
Pages (from-to)	161-164
Number of pages	4
Journal	Physica C: Superconductivity and its Applications
Volume	408-410
Issue number	1-4
DOIs	https://doi.org/10.1016/j.physc.2004.02.069
State	Published - Aug 2004
Event	Proceedings of the International Conference on Materials - Rio de Janeiro, Brazil Duration: 25 May 2003 → 30 May 2003

Keywords

Magnetism
Ruthenates
Superconductivity

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10.1016/j.physc.2004.02.069

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title = "Magnetism and superconductivity in RuM1.5Ce0.5Sr 2Cu2O10 (M = Eu and Y)",

abstract = "RuY1.5Ce0.5Sr2Cu2O 10, is not superconducting (SC) and orders magnetically at T M = 152 K. The Ru moment at 5 K is 0.75μB. Ferromagnetic hysteresis loops are observed below Tirr = 100 K. At 100 K, the remanent magnetization (Mrem) and the coercive field (HC) become zero. Surprisingly, at Tirr < T < T M a reappearance of antiferromagnetic (AFM) hysteresis loops are observed with a peak at 120 K for both Mrem and HC. The paramagnetic constants are: Peff = 2.06μB (greater than the 1.73μB expected for low spin Ru5+) and θ = 136 K which agrees well with TM. Substitution of Zn (2.5\% atm.) for Cu in RuEu1.5Ce0.5 Sr2Cu2O 10 (TC = 38 K), suppresses TC but does not affect the magnetic features such as: TM and Tirr, M rem and HC. This indicates that both SC and magnetic states are practically decoupled. We argue that the magnetic structure of this system becomes (i) AFM ordered at TM. (ii) Due to the tilting of the RuO6 octahedra away from the crystallographic c-axis, at T irr < TM, weak-ferromagnetic (W-FM) order is induced by the canting of the Ru moments. (iii) At TC (TM/T C ∼ 4), the specific materials (M = Eu, Gd) become SC. Below TC, both SC and W-FM states coexist.",

keywords = "Magnetism, Ruthenates, Superconductivity",

author = "I. Felner and E. Galstyan and Awana, \{V. P.S.\} and E. Takayama-Muromachi",

year = "2004",

month = aug,

doi = "10.1016/j.physc.2004.02.069",

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volume = "408-410",

pages = "161--164",

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

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note = "Proceedings of the International Conference on Materials ; Conference date: 25-05-2003 Through 30-05-2003",

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TY - JOUR

T1 - Magnetism and superconductivity in RuM1.5Ce0.5Sr 2Cu2O10 (M = Eu and Y)

AU - Felner, I.

AU - Galstyan, E.

AU - Awana, V. P.S.

AU - Takayama-Muromachi, E.

PY - 2004/8

Y1 - 2004/8

N2 - RuY1.5Ce0.5Sr2Cu2O 10, is not superconducting (SC) and orders magnetically at T M = 152 K. The Ru moment at 5 K is 0.75μB. Ferromagnetic hysteresis loops are observed below Tirr = 100 K. At 100 K, the remanent magnetization (Mrem) and the coercive field (HC) become zero. Surprisingly, at Tirr < T < T M a reappearance of antiferromagnetic (AFM) hysteresis loops are observed with a peak at 120 K for both Mrem and HC. The paramagnetic constants are: Peff = 2.06μB (greater than the 1.73μB expected for low spin Ru5+) and θ = 136 K which agrees well with TM. Substitution of Zn (2.5% atm.) for Cu in RuEu1.5Ce0.5 Sr2Cu2O 10 (TC = 38 K), suppresses TC but does not affect the magnetic features such as: TM and Tirr, M rem and HC. This indicates that both SC and magnetic states are practically decoupled. We argue that the magnetic structure of this system becomes (i) AFM ordered at TM. (ii) Due to the tilting of the RuO6 octahedra away from the crystallographic c-axis, at T irr < TM, weak-ferromagnetic (W-FM) order is induced by the canting of the Ru moments. (iii) At TC (TM/T C ∼ 4), the specific materials (M = Eu, Gd) become SC. Below TC, both SC and W-FM states coexist.

AB - RuY1.5Ce0.5Sr2Cu2O 10, is not superconducting (SC) and orders magnetically at T M = 152 K. The Ru moment at 5 K is 0.75μB. Ferromagnetic hysteresis loops are observed below Tirr = 100 K. At 100 K, the remanent magnetization (Mrem) and the coercive field (HC) become zero. Surprisingly, at Tirr < T < T M a reappearance of antiferromagnetic (AFM) hysteresis loops are observed with a peak at 120 K for both Mrem and HC. The paramagnetic constants are: Peff = 2.06μB (greater than the 1.73μB expected for low spin Ru5+) and θ = 136 K which agrees well with TM. Substitution of Zn (2.5% atm.) for Cu in RuEu1.5Ce0.5 Sr2Cu2O 10 (TC = 38 K), suppresses TC but does not affect the magnetic features such as: TM and Tirr, M rem and HC. This indicates that both SC and magnetic states are practically decoupled. We argue that the magnetic structure of this system becomes (i) AFM ordered at TM. (ii) Due to the tilting of the RuO6 octahedra away from the crystallographic c-axis, at T irr < TM, weak-ferromagnetic (W-FM) order is induced by the canting of the Ru moments. (iii) At TC (TM/T C ∼ 4), the specific materials (M = Eu, Gd) become SC. Below TC, both SC and W-FM states coexist.

KW - Magnetism

KW - Ruthenates

KW - Superconductivity

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DO - 10.1016/j.physc.2004.02.069

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SN - 0921-4534

VL - 408-410

SP - 161

EP - 164

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 -

Magnetism and superconductivity in RuM_1.5Ce_0.5Sr ₂Cu₂O₁₀ (M = Eu and Y)

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Keywords

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