Co Impurity in Palladium: Giant Moment and Kondo-like Coupling

Flouquet, J.; Taurian, Oscar E.; Sanchez, J.P.; Chapellier, M.; Tholence, J.L.

doi:10.1103/physrevlett.38.81

Cited by 33 publications

(13 citation statements)

References 10 publications

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“…The moment was seen to drop rapidly with increase in the Co content. Giant moments have been observed earlier in transition metal doped palladium and alkali metal systems,127–133 and these have been a subject of interesting scientific debate for many years. The giant moment in the Co:SnO 2 case was noted to be much larger than the value of 1.67 μ B /Co for cobalt metal, that for small Co clusters (∼2.1 μ B /Co), or that for any of the standard Co oxides wherein the orbital moment is quenched.…”

Section: 3 Magnetism In Other Metal Oxide Systems (Sno2 Cu2o La1mentioning

confidence: 99%

Dilute Doping, Defects, and Ferromagnetism in Metal Oxide Systems

2010

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Over the past decade intensive research efforts have been carried out by researchers around the globe on exploring the effects of dilute doping of magnetic impurities on the physical properties of functional non-magnetic metal oxides such as TiO(2) and ZnO. This effort is aimed at inducing spin functionality (magnetism, spin polarization) and thereby novel magneto-transport and magneto-optic effects in such oxides. After an early excitement and in spite of some very promising results reported in the literature, this field of diluted magnetic semiconducting oxides (DMSO) has continued to be dogged by concerns regarding uniformity of dopant incorporation, the possibilities of secondary ferromagnetic phases, and contamination issues. The rather sensitive dependence of magnetism of the DMSO systems on growth methods and conditions has led to interesting questions regarding the specific role played by defects in the attendant phenomena. Indeed, it has also led to the rapid re-emergence of the field of defect ferromagnetism. Many theoretical studies have contributed to the analysis of diverse experimental observations in this field and in some cases to the predictions of new systems and scenarios. In this review an attempt is made to capture the scope and spirit of this effort highlighting the successes, concerns, and questions.

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Section: 3 Magnetism In Other Metal Oxide Systems (Sno2 Cu2o La1mentioning

confidence: 99%

Dilute Doping, Defects, and Ferromagnetism in Metal Oxide Systems

2010

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“…There are several reports on a giant magnetic moment of Fe, Mn, and Co when they are either dissolved in or residing on the surface of Pd. [12][13][14] This effect is explained in terms of a spin polarization of the surrounding Pd atoms. Very recently, a giant moment was observed in Co doped SnO 2−␦ , 15 a dilute magnetic semiconductor.…”

Section: B Magnetic Characteristicsmentioning

confidence: 99%

“…Finally, also very recent proposals aimed at explaining a giant magnetic moment and/or high-temperature ferromagnetism in various material systems [12][13][14][15][16] do not apply to the current requirement of a long-range coupling. An actual understanding of the phenomenon observed in the present paper will require detailed ab initio studies, particularly of the f-d coupling between Gd and Ga.…”

Section: ͑2͒mentioning

confidence: 99%

Gd-doped GaN: A very dilute ferromagnetic semiconductor with a Curie temperature above 300 K

et al. 2005

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We present a systematic study of growth, structural, and magnetic characterization of GaN: Gd layers grown directly on 6H-SiC͑0001͒ substrates by reactive molecular-beam epitaxy with a Gd concentration ranging from 7 ϫ 10 15 to 2 ϫ 10 19 cm −3 . The structural properties of these layers are found to be identical to those of undoped GaN layers. However, the magnetic characterization reveals an unprecedented effect. The average value of the magnetic moment per Gd atom is found to be as high as 4000 B as compared to its atomic moment of 8 B . Such a colossal magnetic moment can be explained in terms of a long range spin polarization of the GaN matrix by the Gd atoms which is reflected by the circular polarization of magnetophotoluminescence measurements. Moreover, the material system is found to exhibit ferromagnetism well above room temperature in the entire concentration range under investigation. We propose a phenomenological model to understand the macroscopic behavior of the system. Our study reveals a close connection between the observed ferromagnetism and the colossal magnetic moment of Gd.

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“…4 (a) we compare the transport properties of the undoped and Co-doped [20][21][22][23][24][25][26], and these have been attributed to the unquenched orbital contributions. In such cases, increase in the concentration of dopants has been found to cause a rapid decrease in the moment (as observed in our sample) due to enhanced dopant-dopant associations leading to progressive orbital moment quenching.…”

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confidence: 99%

High Temperature Ferromagnetism with a Giant Magnetic Moment in Transparent Co-dopedSnO2−δ

et al. 2003

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Occurrence of room temperature ferromagnetism is demonstrated in pulsed laser deposited thin films of Sn 1-x Co x O 2-δ (x<0.3). Interestingly, films of Sn 0.95 Co 0.05 O 2-δ grown on R-plane sapphire not only exhibit ferromagnetism with a Curie temperature close to 650 K, but also a giant magnetic moment of 7 ± 0.5 µ B /Co, not yet reported in any diluted magnetic semiconductor system. The films are semiconducting and optically highly transparent.

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Co Impurity in Palladium: Giant Moment and Kondo-like Coupling

Cited by 33 publications

References 10 publications

Dilute Doping, Defects, and Ferromagnetism in Metal Oxide Systems

Dilute Doping, Defects, and Ferromagnetism in Metal Oxide Systems

Gd-doped GaN: A very dilute ferromagnetic semiconductor with a Curie temperature above 300 K

High Temperature Ferromagnetism with a Giant Magnetic Moment in Transparent Co-dopedSnO2−δ

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