Critical magnetic behaviour in one and two dimensions

Köbler, U.; Hoser, A.

doi:10.1016/j.jmmm.2006.08.027

Cited by 9 publications

(2 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The diffuse scattering is quite broad in the hk -plane (with correlation lengths of 55 ± 3 Å and 93 ± 5 Å in h and k , respectively) and extends in rods along l , implying that the magnetic correlations are two-dimensional in nature. These diffuse magnetic scattering features are similar to other layered antiferromagnets above their respective ordering temperatures 24 .…”

Section: Resultssupporting

confidence: 79%

Magnetic frustration, short-range correlations and the role of the paramagnetic Fermi surface of PdCrO2

Billington

Ernsting

Millichamp

et al. 2015

Sci Rep

View full text Add to dashboard Cite

Frustrated interactions exist throughout nature, with examples ranging from protein folding through to frustrated magnetic interactions. Whilst magnetic frustration is observed in numerous electrically insulating systems, in metals it is a rare phenomenon. The interplay of itinerant conduction electrons mediating interactions between localised magnetic moments with strong spin-orbit coupling is likely fundamental to these systems. Therefore, knowledge of the precise shape and topology of the Fermi surface is important in any explanation of the magnetic behaviour. PdCrO2, a frustrated metallic magnet, offers the opportunity to examine the relationship between magnetic frustration, short-range magnetic order and Fermi surface topology. By mapping the short-range order in reciprocal space and experimentally determining the electronic structure, we have identified the dual role played by the Cr electrons in which the itinerant ones on the nested paramagnetic Fermi surface mediate the frustrated magnetic interactions between local moments.

show abstract

Section: Resultssupporting

confidence: 79%

Magnetic frustration, short-range correlations and the role of the paramagnetic Fermi surface of PdCrO2

Billington

Ernsting

Millichamp

et al. 2015

Sci Rep

View full text Add to dashboard Cite

show abstract

“…3,6,7 The low dimensional materials with mixed valence metal oxides show a bunch of interesting physical properties such as, colossal magnetoresistance, [8][9][10] charge-and orbital-ordering, as well as transport properties 11 due to highly anisotropic as well as competitive exchange interactions between the transition metal ions in these systems. [12][13][14][15] Moreover, the presence of these behaviours leads to a complex phase diagram (magnetic as well as electronic) for the low dimensional mixed valence metal oxides.…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetic clusters in the Brownmillerite bilayered compounds Ca2.5−xLaxSr0.5GaMn2O8: An approach to achieve layered spintronics materials

Bera

Yusuf

2010

Journal of Applied Physics

View full text Add to dashboard Cite

We report the effect of La-substitution on the magnetic and magnetotransport properties of Brownmillerite-like bilayered compounds Ca 2.5-x La x Sr 0.5 GaMn 2 O 8 (x = 0, 0.05, 0.075, and 0.1) by using dc-magnetization, resistivity and magnetoresistance techniques. The Rietveld analysis of the room temperature x-ray diffraction patterns confirms no observable change of average crystal structure with the La-substitution. Both magnetic and magnetotransport properties are found to be very sensitive to the La-substitution. Interestingly, the La-substituted compounds show ferromagnetic-like behavior (due to the occurrence of a double exchange mechanism) whereas, the parent compound is an antiferromagnet (T N~1 50 K). All compounds show an insulating behavior, in the measured temperature range of 100 -300 K, with an overall decrease in the resistivity with the substitution. A higher value of magnetoresistance has been successfully achieved by the La-substitution. We have proposed an electronic phase separation model, considering the formation of ferromagnetic clusters in the antiferromagnetic matrix, to interpret the observed magnetization and magnetotransport results for the La-substituted samples. The present study demonstrates an approach to achieve new functional materials, based on naturally occurring layered system like Ca 2.5-x La x Sr 0.5 GaMn 2 O 8 , for possible spintronics applications.

show abstract