Two-dimensional antiferromagnetic ordering in high-T sub c superconductors with low oxygen content

Journal Article · Mon May 01 00:00:00 EDT 1989 · International Journal of Modern Physics B; (USA)

DOI:https://doi.org/10.1142/S021797928900052X· OSTI ID:7007478

Pavlukhin, Y T; Hainovsky, N G; Medikov, Y Y; Rykov, A I ^[1]

---

1. Institute of Solid State Chemistry, Siberian Academy of Sciences, Derzhavina 18, Novosibirsk 630091 (SU)

Since the discovery of superconductivity in the temperature range of 90-93 K in YBa{sub 2}Cu{sub 3}O{sub 7 {minus} {delta}}, which is the so-called 123 compound, much effort has been devoted to assess copper cation state (valence and spin value) and their distribution among Cu(1) and Cu(2) planes. Understanding this is of considerable importance since copper electrons form the conduction band. Moreover, understanding plane distribution of copper ions allows to ascertain the copper plane (Cu(1) or Cu(2)) which is responsible for superconductivity. Copper ions have been found to be in three different electronic configurations in this compound: 3d{sup 10}, 3d{sub 9}, 3d{sup 8} (Cu{sup 1+}, Cu{sup 2+}, Cu{sup 3+}). Obviously, their correlation and, possibly, distribution among different planes may be changed depending on the oxygen content. The presence of 3d-cations, which bear nonzero spin magnetic moment, may lead to magnetic ordering by analogy with well-known perovskites. Antiferromagnetic order of the copper sublattice (Cu(2)-plane) has been observed by neutron scattering for low oxygen content samples of YBa{sub 2}Cu{sub 3}O{sub 7 {minus} {delta}}. Therefore, investigation of copper ion states and their distribution among different planes with varying oxygen content excites interest. Mosssbauer spectroscopy of {sup 57}Fe atoms doped YBa{sub 2}Cu{sub 3}O{sub 7 {minus} {delta}} compound makes it possible to investigate electronic properties, crystallographic positions of ions, and moreover, magnetic order. The present paper aims to obtain measurements of {sup 57}Fe Mossbauer isotope incorporated into the superconductor in order to determine the copper ions states, their distribution among Cu(1) and Cu(2) planes as well as magnetic order in oxygen deficient samples.

• OSTI ID: 7007478
• Journal Information: International Journal of Modern Physics B; (USA), Vol. 3:5; ISSN 0217-9792
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETISM
ORDER-DISORDER TRANSFORMATIONS
BARIUM OXIDES
SUPERCONDUCTIVITY
COPPER OXIDES
SUPERCONDUCTORS
CHARGE DISTRIBUTION
YTTRIUM OXIDES
BAND THEORY
COPPER IONS
DOPED MATERIALS
EXCITED STATES
HIGH TEMPERATURE
IRON 57
MOESSBAUER EFFECT
MOTT SCATTERING
OXYGEN
SPIN WAVES
TWO-DIMENSIONAL CALCULATIONS
VALENCE
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
CHARGED PARTICLES
COPPER COMPOUNDS
ELASTIC SCATTERING
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
ENERGY LEVELS
EVEN-ODD NUCLEI
INTERMEDIATE MASS NUCLEI
IONS
IRON ISOTOPES
ISOTOPES
MAGNETISM
MATERIALS
NONMETALS
NUCLEI
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SCATTERING
STABLE ISOTOPES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties
656100 - Condensed Matter Physics- Superconductivity
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies
656002 - Condensed Matter Physics- General Techniques in Condensed Matter- (1987-)