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Kobayashi, Kojiro; Kimura, Takeshi; Tomioka, Y.; Sawada, Hideaki; Terakura, Kiyoyuki; Tokura, Y.

doi:10.1103/physrevb.59.11159

Cited by 479 publications

(294 citation statements)

References 11 publications

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“…A similar behaviour is seen in Figure 2 of Ref. [22] for an SFRO sample sintered in an Ar atmosphere. Prolonged heat treatment of our sample in air at 400 o C restored inter-grain tunnelling and the σ(T) plot straightened up (see lower curve in Fig.…”

Section: Resultssupporting

confidence: 63%

Inter-grain tunnelling in the half-metallic double-perovskites Sr₂BB'O₆(BB'= FeMo, FeRe, CrMo, CrW, CrRe)

Fisher

Genossar

Chashka

et al. 2014

EPJ Web of Conferences

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Abstract. The zero-field conductivities (σ) of polycrystalline title materials, are governed by intergrain transport. In the majority of cases their σ(T) can be described by the "fluctuation induced tunnelling" model. Analysis of the results in terms of this model reveals two remarkable features: 1. For all Sr2FeMoO6 samples of various microstructures, the tunnelling constant (barrier width × inverse decay-length of the wave-function) is ~ 2, indicating the existence of an intrinsic insulating boundary layer with a well-defined electronic (and magnetic) structure. 2. The tunnelling constant for all cold-pressed samples decreases linearly with increasing magnetic-moment/formula-unit.

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Section: Resultssupporting

confidence: 63%

Inter-grain tunnelling in the half-metallic double-perovskites Sr₂BB'O₆(BB'= FeMo, FeRe, CrMo, CrW, CrRe)

Fisher

Genossar

Chashka

et al. 2014

EPJ Web of Conferences

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“…7 Although Sr 2 FeReO 6 (see Ref. 8) shows similar TMR properties to those of Sr 2 FeMoO 6 , recent studies claim that the Ca-compound, Ca 2 FeReO 6 , unlike Ca 2 FeMoO 6 , may be insulating. 9 It has been suggested that the magnetic temperature T c , and whether the ground state is metallic or insulating, vary as A is changed from Ba to Sr to Ca.…”

Section: Introductionmentioning

confidence: 99%

Electronic structure of half-metallic double perovskites

et al. 2003

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We present the self-interaction corrected local spin density (SIC-LSD) electronic structure and total energy calculations, leading also to valencies of the ground state configurations, for the halfmetallic double perovskites such as Sr2FeMoO6, Ba2FeMoO6, Ca2FeMoO6, and Ca2FeReO6. We conclude that the Fe and Mo (or Re) spin magnetic moments are anti-parallel aligned, and the magnitude of the hybridization induced moment on Mo does not vary much between the different compounds. The hybridization spin magnetic moment on Re is of the order of -1.1 µB, while that on Mo is about -0.4 µB, independently of the alkaline earth element. Also the electronic structure of all the compounds studied is very similar, with a well defined gap in the majority spin component and metallic density of states for the minority spin component, with highly hybridized Fe, Mo (or Re), and oxygen bands.

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“…T C = 635 K in Sr 2 CrReO 6 [2]. Large low field magnetoresistance effects are found in Sr 2 FeMoO 6 [1,3], Sr 2 FeReO 6 [4] and Sr 2 CrWO 6 [5]. Thin films of the well studied system Sr 2 FeMoO 6 have been fabricated by pulsed-laser deposition (PLD) at relatively high temperatures of about 900 • C [6].…”

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confidence: 99%

Epitaxial growth and transport properties of Sr2CrWO6 thin films

Philipp

Reisinger

Schonecke

et al. 2003

Journal of Applied Physics

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We report on the preparation and characterization of epitaxial thin films of the double-perovskite Sr 2 CrWO 6 by Pulsed Laser Deposition (PLD). On substrates with low lattice mismatch like SrTiO 3 , epitaxial Sr 2 CrWO 6 films with high crystalline quality can be grown in a molecular layer-by-layer growth mode. Due to the similar ionic radii of Cr and W, these elements show no sublattice order. Nevertheless, the measured Curie temperature is well above 400 K. Due to the reducing growth atmosphere required for double perovskites, the SrTiO 3 substrate surface undergoes an insulator-metal transition impeding the separation of thin film and substrate electric transport properties. [5]. Thin films of the well studied system Sr 2 FeMoO 6 have been fabricated by pulsed-laser deposition (PLD) at relatively high temperatures of about 900 • C [6]. However, epitaxial growth was found to be complicated and difficult to control. There are indications that high structural quality of films grown on SrTiO 3 is associated with semiconducting behavior [7,8]. Here, we report on the epitaxial growth of Sr 2 CrWO 6 . Due to the good lattice match, epitaxial films of this material can be grown on SrTiO 3 substrates in a molecular layer-by-layer growth mode resulting in high crystalline quality.Sr 2 CrWO 6 thin films were deposited from stoichiometric targets [5] on atomically flat, HF etched and annealed (001) SrTiO 3 substrates by PLD using a 248 nm KrF excimer laser [9]. Fig. 1 shows the RHEED (Reflection High Energy Electron Diffraction) [10] intensity oscillations of the (0, 0) diffraction spot recorded during the PLD growth of a c-axis oriented Sr 2 CrWO 6 film. The molecular layer-bylayer or Frank-van der Merwe growth mode [11] is achieved for a substrate temperature of 740 • C, an argon pressure of 2 × 10 −4 Torr, a laser repetition rate of 2 Hz, and a laser energy density on the target of 1.2 J/cm 2 . RHEED was performed with 15 keV electrons at an incident angle of about 2 • . To obtain the number of RHEED oscillations per unit cell, the film thickness has been determined precisely by X-ray reflectometry (Fig. 4) and then divided by the number of observed RHEED oscillations. The derived molecular layer or block thickness corresponds to half a unit cell (c/2 = 4.004Å). Note that the intensity oscillations of the (0,0) and (0,1) spot are out of phase, since for the (0,1) spot the electrons reflected from different growth planes interfere constructively (in-Bragg condition). In this case no RHEED oscillations are expected. The fact that we do observe RHEED oscillations is caused by multiple and diffuse, incoherent scattering which results in an * Electronic address: Boris.Philipp@wmi.badw.de increasing (decreasing) intensity with increasing (decreasing) step density [12,13]. Figure 2 shows an in situ AFM picture of a 42 nm thick film. Clearly, a terrace structure due to the nonvanishing substrate miscut with about 4Å high steps corresponding to half a unit cell of Sr 2 CrWO 6 can be seen. The AFM analysis shows that Sr 2 CrW...

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Intergrain tunneling magnetoresistance in polycrystals of the ordered double perovskiteSr2FeReO6

Cited by 479 publications

References 11 publications

Inter-grain tunnelling in the half-metallic double-perovskites Sr₂BB'O₆(BB'= FeMo, FeRe, CrMo, CrW, CrRe)

Inter-grain tunnelling in the half-metallic double-perovskites Sr₂BB'O₆(BB'= FeMo, FeRe, CrMo, CrW, CrRe)

Electronic structure of half-metallic double perovskites

Epitaxial growth and transport properties of Sr2CrWO6 thin films

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Intergrain tunneling magnetoresistance in polycrystals of the ordered double perovskiteSr2FeReO6

Cited by 479 publications

References 11 publications

Inter-grain tunnelling in the half-metallic double-perovskites Sr2BB'O6(BB'= FeMo, FeRe, CrMo, CrW, CrRe)

Inter-grain tunnelling in the half-metallic double-perovskites Sr2BB'O6(BB'= FeMo, FeRe, CrMo, CrW, CrRe)

Electronic structure of half-metallic double perovskites

Epitaxial growth and transport properties of Sr2CrWO6 thin films

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Product

Resources

About

Inter-grain tunnelling in the half-metallic double-perovskites Sr₂BB'O₆(BB'= FeMo, FeRe, CrMo, CrW, CrRe)

Inter-grain tunnelling in the half-metallic double-perovskites Sr₂BB'O₆(BB'= FeMo, FeRe, CrMo, CrW, CrRe)