Soft x-ray magnetic circular dichroism study of the ferromagnetic spinel-type Cr chalcogenides

Kimura, Akio; Matsuno, Jobu; Okabayashi, Jun; Fujimori, A.; Shishidou, Tatsuya; Kulatov, E.; Kanomata, T.

doi:10.1103/physrevb.63.224420

Cited by 63 publications

(54 citation statements)

References 35 publications

(18 reference statements)

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“…should be noted that this picture is similar to that deduced from neutron diffraction studies in reference [3] and from XMCD in reference [16].…”

Section: Electronic Structure Calculationssupporting

confidence: 70%

“…6a) indicates that the chemical composition at the surface of post-annealed films is similar to that of the bulk. [16] XMCD spectra of Cr indicate magnetism persists to the surface of the post-annealed films (Fig. 6b).…”

Section: (C) Magnetizationmentioning

confidence: 99%

“…Moreover, the XMCD lineshape is characteristic of Cr in an octahedral environment and compares well to bulk data. [16] (d) Transport…”

Section: (C) Magnetizationmentioning

confidence: 99%

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Magnetism and transport of CuCr2Se4 thin films

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Chopdekar

Liberati

et al. 2007

Journal of Magnetism and Magnetic Materials

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We report the successful growth of highly spin-polarized chalcogenide thin films of CuCr 2 Se 4 , which are promising candidates for spin-based electronic applications. We also present electronic structure calculations for CuCr 2 Se 4 that, together with magnetic and transport data, imply that the stoichiometric compound is a metallic ferromagnet with a relatively low density of hole-like carriers at the Fermi energy. These calculations also predict that a deficiency of Se will deplete the minority density of states at the Fermi energy perhaps leading to a half-metal. We have successfully grown thin films of CuCr 2 Se 4 by pulsed laser deposition on isostructural MgAl 2 O 4 substrates followed by an anneal in a Se-rich environment. X-ray diffraction confirms the structure of CuCr 2 Se 4 on MgAl 2 O 4 substrates as well as a secondary phase of Cr 2 Se 3 . X-ray absorption spectroscopy indicates that the chemical structure at the surface of the films is similar to that of bulk CuCr 2 Se 4 single crystals. Magnetization measurements indicate that these films saturate with a magnetic moment close to 5 µ B per formula unit and a T c above 400 K. X-ray magnetic circular dichroism shows that the magnetism persists to the surface of the film.Resistivity and Hall effect measurements are consistent with a p-type ferromagnetic metallic behavior and with the electronic structure calculations.1

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“…should be noted that this picture is similar to that deduced from neutron diffraction studies in reference [3] and from XMCD in reference [16].…”

Section: Electronic Structure Calculationssupporting

confidence: 70%

Section: (C) Magnetizationmentioning

confidence: 99%

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Magnetism and transport of CuCr2Se4 thin films

Bettinger

Chopdekar

Liberati

et al. 2007

Journal of Magnetism and Magnetic Materials

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“…Lotgering and co-workers 56,57,64,72 proposed that the mixed valence model of Cr ion has been shown as Cu 56,57,64,72,76 This interpretation has been verified experimentally by recent precise magnetic circular dichroism in the soft x-ray absorption spectra. 74 Kimura et al 74 pointed out that the spin magnetic moment of Cu site in CuCr 2 S 4 is as large as 0.078 B per Cu atom.…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetism and the metal-insulator transition in the thiospinelCu(Ir1−x
Endoh
¹
,
Awaka
²
,
Nagata
³

2003
Phys. Rev. B
24
6
25
0
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A thiospinel CuIr 2 S 4 exhibits a temperature-induced metal-insulator (M -I) transition at 230 K with a simultaneous spin-dimerization and charge-ordering transition although a three-dimensional system. On the other hand, CuCr 2 S 4 has the same spinel structure without any structural transformations. CuCr 2 S 4 remains metallic and is ferromagnetic with the Curie temperature T C Ӎ377 K. In order to see the effect of substituting Cr for Ir on the M -I transition, we have carried out a systematic experimental study of electrical and magnetic properties of Cu(Ir 1Ϫx Cr x ) 2 S 4 system. The M -I transition temperature decreases steeply with increasing Crcomposition x and this transition is not detected above xӍ0.05. The value of T C decreases with decreasing x from 1.0, then T C disappears below xӍ0.20. The ferromagnetic state suggests the non-collinear spin alignment. In the intermediate composition range over xϭ0.08 to 0.20, the B-site undergoes a local crystal distortion around 180 K, where the energy level t 2g splits into lower symmetry. Then the low-spin state within the t 2g subspace is realized for Cr 3ϩ ion with sϭ1/2. The magnetic state of Cr 3ϩ ion indicates a crossover from high temperature sϭ3/2 to low temperature sϭ1/2 state around 180 K.

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“…This paper describes large negative MR combined with VRH conduction observed in sulfospinel CuCrZrS 4 . Spinel CuCr 2 S 4 is a well known metallic and ferromagnetic compound with the Curie temperature T C of about 400 K. [8][9][10][11] Recently, spinel CuCrZrS 4 was obtained by substituting half of Cr by Zr. [12] It has the same normal spinel structure with Cu in the A site, which is tetrahedrally coordinated with S, and Cr and Zr in the B site, which is octahedrally coordinated.…”

mentioning

confidence: 99%