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Title(s)
Title | Language |
Colossal magnetoresistance in EuZn2P2 and its electronic and magnetic structure | en |
Author(s)
Name | ORCID | GND | Affiliation |
Faculty
13 Physics
DFG-Subject
307-01 Experimental Condensed Matter Physics
Date Issued
12 July 2023
Publisher(s)
Goethe-Universität Frankfurt
Type(s) of data
Dataset
Language(s)
en
Abstract(s)
Abstract | Language |
We investigate single crystals of the trigonal antiferromagnet EuZn2P2 (P-3m1) by means of electrical trans- port, magnetization measurements, x-ray magnetic scattering, optical reflectivity, angle-resolved photoemission spectroscopy (ARPES), and ab initio band structure calculations (DFT + U ). We find that the electrical resistivity of EuZn2P2 increases strongly upon cooling and can be suppressed in magnetic fields by several orders of magnitude (colossal magnetoresistance effect). Resonant magnetic scattering reveals a magnetic ordering vector of q = (0 0 1/2 ), corresponding to an A-type antiferromagnetic order, below TN = 23.7 K. We find that the moments are canted out of the a-a plane by an angle of about 40° ± 10° and aligned along the [100] direction in the a-a plane. We observe nearly isotropic magnetization behavior for low fields and low temperatures which is consistent with the magnetic scattering results. The magnetization measurements show a deviation from the Curie-Weiss behavior below ≈150 K, the temperature below which also the field dependence of the material’s resistivity starts to increase. An analysis of the infrared reflectivity spectrum at T = 295 K allows us to resolve the main phonon bands and intraband and interband transitions, and estimate indirect and direct band gaps of E_opt,i = 0.09 and E_opt,d = 0.33 eV, respectively, which are in good agreement with the theoretically predicted ones. The experimental band structure obtained by ARPES is nearly T independent above and below T_N . The comparison of the theoretical and experimental data shows a weak intermixing of the Eu 4f states close to the point with the bands formed by the phosphorous 3p orbitals leading to an induction of a small magnetic moment at the P sites. | en |
Description(s)
Description | Language |
Raw data of the figures from the original publication. The data are available both as Origin file or as plain ASCI data. | en |
Related Resource(s)
Type of identifier | Identifier | Type of publication | Type of relation |
DOI | 10.1103/PhysRevB.108.045116 | JournalArticle | IsSupplementTo |
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