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Anomalous critical behavior and localized ferromagnetism of the half‐metallic double perovskite Sr 2 CrReO 6
Ist Teil von
Journal of the American Ceramic Society, 2024-02, Vol.107 (2), p.1052-1060
Erscheinungsjahr
2024
Quelle
Wiley Online Library All Journals
Beschreibungen/Notizen
Abstract
Double perovskites such as Sr
2
CrReO
6
attract great scientific attention owing to their high Curie temperatures (
T
C
≥ 550 K) as well as large magnetoresistances. However, both the specific physical mechanism of high
T
C
and magnetic ground state in Sr
2
CrReO
6
remain ill‐defined. In order to clarify and understand these issues, we studied its critical phase transition characteristics using critical behavior analysis. We found that the obtained critical exponents (
β
= 1.115 and
γ
= 2.224) are quite different from any traditional universality class. The abnormal critical behavior implies that at the quantum critical point, Sr
2
CrReO
6
exists a strong competition among several magnetic interactions. By analyzing their effective critical exponents, we show that the double perovskite Sr
2
CrReO
6
is really an ordered and homogeneous ferromagnet. With the help of Takahashi's theory, the nature of ferromagnetism in Sr
2
CrReO
6
is confirmed to be localized instead of itinerant. The results of this research will provide new insights into the origins of high
T
C
as well as the magnetic ground state in this double perovskite.
Sprache
Englisch
Identifikatoren
ISSN: 0002-7820
eISSN: 1551-2916
DOI: 10.1111/jace.19502
Titel-ID: cdi_crossref_primary_10_1111_jace_19502
Format
–
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