The valence of Ru, Ce and Eu ions in the magneto-superconductor Eu1.5Ce0.5RuSr2Cu2O10

I. Felner; U. Asaf; C. Godart; E. Alleno

doi:10.1016/S0921-4526(98)00945-4

The valence of Ru, Ce and Eu ions in the magneto-superconductor Eu_1.5Ce_0.5RuSr₂Cu₂O₁₀

I. Felner^*
, U. Asaf
, C. Godart
, E. Alleno

^*Corresponding author for this work

Racah Institute of Physics

Research output: Contribution to journal › Article › peer-review

40 Scopus citations

Abstract

The superconducting (T_c ∼ 32 K) Eu_1.5Ce_0.5RuSr₂Cu₂O₁₀ (Ru-2122) material is also magnetically ordered (T_M ∼ 122 K) with T_M » T_c. Superconductivity (SC) is confined to the CuO₂ planes, whereas magnetism is due to the Ru sublattice. Mossbauer spectroscopy performed at 90 and 300 K on ¹⁵¹Eu shows a single narrow line with an isomer shift = 0.69(2) and a quadrupole splitting of 1.84 mm/s, indicating that the Eu ions are trivalent with a nonmagnetic J = 0 ground state. This is in agreement with X-ray-absorption spectroscopy (XAS) taken at L_III edges of Eu, Ce which shows that Eu is trivalent and Ce is tetravalent. XAS experiments at the K edge of Ru indicate that Ru is pentavalent. This indicates, that in the M-2122 system, SC exists only for pentavalent M ions such as Ta, Nb and Ru.

Original language	English
Pages (from-to)	703-704
Number of pages	2
Journal	Physica B: Condensed Matter
Volume	259-261
DOIs	https://doi.org/10.1016/S0921-4526(98)00945-4
State	Published - 1999

Keywords

Magnetism
Mossbauer spectroscopy
Superconductivity
X-ray absorption spectroscopy

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10.1016/S0921-4526(98)00945-4

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@article{349b4c14726e48608ebac635682ef73e,

title = "The valence of Ru, Ce and Eu ions in the magneto-superconductor Eu1.5Ce0.5RuSr2Cu2O10",

abstract = "The superconducting (Tc ∼ 32 K) Eu1.5Ce0.5RuSr2Cu2O10 (Ru-2122) material is also magnetically ordered (TM ∼ 122 K) with TM » Tc. Superconductivity (SC) is confined to the CuO2 planes, whereas magnetism is due to the Ru sublattice. Mossbauer spectroscopy performed at 90 and 300 K on 151Eu shows a single narrow line with an isomer shift = 0.69(2) and a quadrupole splitting of 1.84 mm/s, indicating that the Eu ions are trivalent with a nonmagnetic J = 0 ground state. This is in agreement with X-ray-absorption spectroscopy (XAS) taken at LIII edges of Eu, Ce which shows that Eu is trivalent and Ce is tetravalent. XAS experiments at the K edge of Ru indicate that Ru is pentavalent. This indicates, that in the M-2122 system, SC exists only for pentavalent M ions such as Ta, Nb and Ru.",

keywords = "Magnetism, Mossbauer spectroscopy, Superconductivity, X-ray absorption spectroscopy",

author = "I. Felner and U. Asaf and C. Godart and E. Alleno",

year = "1999",

doi = "10.1016/S0921-4526(98)00945-4",

language = "אנגלית",

volume = "259-261",

pages = "703--704",

journal = "Physica B: Condensed Matter",

issn = "0921-4526",

publisher = "Elsevier B.V.",

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T1 - The valence of Ru, Ce and Eu ions in the magneto-superconductor Eu1.5Ce0.5RuSr2Cu2O10

AU - Felner, I.

AU - Asaf, U.

AU - Godart, C.

AU - Alleno, E.

PY - 1999

Y1 - 1999

N2 - The superconducting (Tc ∼ 32 K) Eu1.5Ce0.5RuSr2Cu2O10 (Ru-2122) material is also magnetically ordered (TM ∼ 122 K) with TM » Tc. Superconductivity (SC) is confined to the CuO2 planes, whereas magnetism is due to the Ru sublattice. Mossbauer spectroscopy performed at 90 and 300 K on 151Eu shows a single narrow line with an isomer shift = 0.69(2) and a quadrupole splitting of 1.84 mm/s, indicating that the Eu ions are trivalent with a nonmagnetic J = 0 ground state. This is in agreement with X-ray-absorption spectroscopy (XAS) taken at LIII edges of Eu, Ce which shows that Eu is trivalent and Ce is tetravalent. XAS experiments at the K edge of Ru indicate that Ru is pentavalent. This indicates, that in the M-2122 system, SC exists only for pentavalent M ions such as Ta, Nb and Ru.

AB - The superconducting (Tc ∼ 32 K) Eu1.5Ce0.5RuSr2Cu2O10 (Ru-2122) material is also magnetically ordered (TM ∼ 122 K) with TM » Tc. Superconductivity (SC) is confined to the CuO2 planes, whereas magnetism is due to the Ru sublattice. Mossbauer spectroscopy performed at 90 and 300 K on 151Eu shows a single narrow line with an isomer shift = 0.69(2) and a quadrupole splitting of 1.84 mm/s, indicating that the Eu ions are trivalent with a nonmagnetic J = 0 ground state. This is in agreement with X-ray-absorption spectroscopy (XAS) taken at LIII edges of Eu, Ce which shows that Eu is trivalent and Ce is tetravalent. XAS experiments at the K edge of Ru indicate that Ru is pentavalent. This indicates, that in the M-2122 system, SC exists only for pentavalent M ions such as Ta, Nb and Ru.

KW - Magnetism

KW - Mossbauer spectroscopy

KW - Superconductivity

KW - X-ray absorption spectroscopy

UR - https://www.scopus.com/pages/publications/9344245132

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DO - 10.1016/S0921-4526(98)00945-4

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AN - SCOPUS:9344245132

SN - 0921-4526

VL - 259-261

SP - 703

EP - 704

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

ER -

The valence of Ru, Ce and Eu ions in the magneto-superconductor Eu_1.5Ce_0.5RuSr₂Cu₂O₁₀

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Keywords

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