Indirect Exchange Interactions in Orthorhombic Lanthanide Aluminates

• Authors: D. Petrov , B. Angelov
• Languages of publication: EN

Abstracts

EN

Magnetic exchange interactions in orthorhombic lanthanide monoaluminates LnAlO_3, Ln = Sm-Yb have been determined semiempirically within the Anderson model of exchange in insulators. The constants of magnetic exchange have been evaluated assuming indirect exchange between pairs of nearest Ln^{3+}-Ln^{3+} ions via 4f^{n} → 4f^{n-1}5d excitation and ionic polarization. The transfer integrals have been approximated by two-centre overlap integrals between four-term analytical 4f^{n} radial wave functions of Ln^{3+} ions. The results have been compared with the available experimental Néel temperatures in the same compounds. It has been found that in most cases the indirect exchange interactions present substantial contributions to the energy of the antiferromagnetically ordered state in LnAlO_3.

Keywords

EN

75.30.Kz; 75.30.Et

Discipline

• 75.30.Et: Exchange and superexchange interactions(see also 71.70.Gm Exchange interactions)
• 75.30.Kz: Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)(for ferroelectric phase transitions, see 77.80.B-; for superconductivity phase diagrams, see 74.25.Dw)

• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 122
• Issue: 4
• Pages: 737-740

Dates

published

2012-10

received

2011-12-14

(unknown)

2012-08-14

Contributors

author

D. Petrov

• University of Plovdiv, Dept. of Physical Chemistry, 24, Tsar Asen Str., 4000 Plovdiv, Bulgaria

author

B. Angelov

• University of Plovdiv, Dept. of Physical Chemistry, 24, Tsar Asen Str., 4000 Plovdiv, Bulgaria

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Identifiers

DOI

10.12693/APhysPolA.122.737