EuTiO^sub 3^: The low-energy electronic structure of Eu^sup 2+^ from the specific heat

We present the low-energy electronic structure originating from the 8S7/2 ground multiplet of the Eu2+ ions derived from theoretical description of the temperature dependence of the specific heat at low temperatures, including the λ-type peak at TN, both at zero field and in external magnetic fields...

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Bibliographic Details
Published in:Materials chemistry and physics 2017-01, Vol.186, p.426
Main Authors: Radwanski, RJ, Nalecz, DM, Fedyk, SS, Ropka, Z
Format: Article
Language:English
Subjects:
Atomic structure
Electronic structure
Ferromagnetism
Heat
Heat exchange
Ions
Magnetic fields
Specific heat
Temperature
Temperature dependence
Thermodynamics
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Summary:We present the low-energy electronic structure originating from the 8S7/2 ground multiplet of the Eu2+ ions derived from theoretical description of the temperature dependence of the specific heat at low temperatures, including the λ-type peak at TN, both at zero field and in external magnetic fields. The derived energy states are the physical reality--they can be probed by different techniques and on this basis results of different theoretical models can be compared. Our atomic-like approach consistently explains zero-temperature properties and thermodynamics. We separate the derived molecular field at T = 0 K of 2.73 T for contributions coming from antiferro- and ferromagnetic interactions and derived exchange constants J1 = -16.6 mK (AF) and J2 = +35.3 mK (F).
ISSN:0254-0584
1879-3312