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Gang T, Yilmaz MD, Ataç D, Bose SK, Strambini E, Velders AH, de Jong MP, Huskens J, van der Wiel WG. Tunable doping of a metal with molecular spins. NATURE NANOTECHNOLOGY 2012; 7:232-236. [PMID: 22306840 DOI: 10.1038/nnano.2012.1] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2011] [Accepted: 12/23/2011] [Indexed: 05/31/2023]
Abstract
The mutual interaction of localized magnetic moments and their interplay with itinerant conduction electrons in a solid are central to many phenomena in condensed-matter physics, including magnetic ordering and related many-body phenomena such as the Kondo effect, the Ruderman-Kittel-Kasuya-Yoshida interaction and carrier-induced ferromagnetism in diluted magnetic semiconductors. The strength and relative importance of these spin phenomena are determined by the magnitude and sign of the exchange interaction between the localized magnetic moments and also by the mean distance between them. Detailed studies of such systems require the ability to tune the mean distance between the localized magnetic moments, which is equivalent to being able to control the concentration of magnetic impurities in the host material. Here, we present a method for doping a gold film with localized magnetic moments that involves depositing a monolayer of a metal terpyridine complex onto the film. The metal ions in the complexes can be cobalt or zinc, and the concentration of magnetic impurities in the gold film can be controlled by varying the relative amounts of cobalt complexes (which carry a spin) and zinc complexes (which have zero spin). Kondo and weak localization measurements demonstrate that the magnetic impurity concentration can be systematically varied up to ∼800 ppm without any sign of inter-impurity interaction. Moreover, we find no evidence for the unwanted clustering that is often produced when using alternative methods.
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Affiliation(s)
- T Gang
- NanoElectronics Group, MESA+ Institute for Nanotechnology, University of Twente, PO Box 217, 7500 AE, Enschede, The Netherlands
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Szunyogh L, Zaránd G, Gallego S, Muñoz MC, Györffy BL. Effect of spin-orbit interaction on a magnetic impurity in the vicinity of a surface. PHYSICAL REVIEW LETTERS 2006; 96:067204. [PMID: 16606040 DOI: 10.1103/physrevlett.96.067204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2005] [Indexed: 05/08/2023]
Abstract
We propose a new mechanism for surface-induced magnetic anisotropy to explain the thickness dependence of the Kondo resistivity of thin films of dilute magnetic alloys. The surface anisotropy energy, generated by spin-orbit coupling on the magnetic impurity itself, is an oscillating function of the distance d from the surface and decays as 1/d2. Numerical estimates based on simple models suggest that this mechanism, unlike its alternatives, gives rise to an effect of the desired order of magnitude.
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Affiliation(s)
- L Szunyogh
- Department of Theoretical Physics and Center for Applied Mathematics and Computational Physics, Budapest University of Technology and Economics, Budafoki út. 8, 1521 Budapest, Hungary
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Seynaeve E, Temst K, Aliev FG, Gladilin VN, Fomin VM, Devreese JT. Impurity spin magnetization of thin Fe doped Au films. PHYSICAL REVIEW LETTERS 2000; 85:2593-2596. [PMID: 10978115 DOI: 10.1103/physrevlett.85.2593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/1999] [Indexed: 05/23/2023]
Abstract
In order to probe the influence of the surface-induced anisotropy on the impurity spin magnetization, we measure the anomalous Hall effect in thin AuFe films at magnetic fields up to 15 T. The observed suppression of the anomalous Hall resistivity at low fields as well as the appearance of a minimum in the differential Hall resistivity at higher fields can be explained by our theoretical model, which takes into account the influence of a polycrystalline film structure on the surface-induced anisotropy. Our results imply that the apparent discrepancy between different experimental results for the size effects in dilute magnetic alloys can be linked to a different microstructure of the samples.
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Affiliation(s)
- E Seynaeve
- Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
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Chen YY, Yao YD, Wang CR, Li WH, Chang CL, Lee TK, Hong TM, Ho JC, Pan SF. Size-induced transition from magnetic ordering to kondo behavior in (Ce,Al) compounds. PHYSICAL REVIEW LETTERS 2000; 84:4990-4993. [PMID: 10990849 DOI: 10.1103/physrevlett.84.4990] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/1999] [Indexed: 05/23/2023]
Abstract
Magnetic ordering and Kondo behavior coexist in three (Ce,Al)-based compounds: CeAl2, Ce3Al, and Ce3Al11. A common feature apparently independent of crystal structures also prevails in terms of the size-induced transition between these two magnetic phenomena. As the particle size is reduced to nanoscale, the specific heat anomaly associated with the magnetic ordering diminishes. Although the Kondo temperature also decreases, the entropy associated with Kondo anomaly exhibits a large increase. This results in an enhancement of the Kondo behavior and an increased coefficient gamma of the linear term in specific heat. For example, in 80 A CeAl2 the extrapolated r(0) reaches 9000 mJ mol Ce-1 K-2.
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Affiliation(s)
- YY Chen
- Institute of Physics, Academia Sinica, Taipei, Taiwan, Republic of China
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Mohanty P, Webb RA. Low temperature anomaly in mesoscopic kondo wires. PHYSICAL REVIEW LETTERS 2000; 84:4481-4484. [PMID: 10990716 DOI: 10.1103/physrevlett.84.4481] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/1998] [Revised: 01/19/2000] [Indexed: 05/23/2023]
Abstract
We report the observation of an anomalous magnetoresistance in extremely dilute quasi-one-dimensional AuFe wires at low temperatures, along with a hysteretic background at low fields. The Kondo resistivity does not show the unitarity limit down to the lowest temperature, implying uncompensated spin states. We suggest that the anomalous magnetoresistance may be understood as the interference correction from the accumulation of geometric phase in the conduction electron wave function around the localized impurity spin.
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Affiliation(s)
- P Mohanty
- Condensed Matter Physics 114-36, California Institute of Technology, Pasadena, California 91125, USA
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Zaránd G, Udvardi L. Enhancement of the Kondo temperature of magnetic impurities in metallic point contacts due to the fluctuations of the local density of states. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:7606-7609. [PMID: 9984415 DOI: 10.1103/physrevb.54.7606] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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7
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Eom J, Neuttiens G, Strunk C, Bruynseraede Y, Chandrasekhar V. Asymmetric Nonlinear Differential Resistance of Mesoscopic AuFe Spin-Glass Wires. PHYSICAL REVIEW LETTERS 1996; 77:2276-2279. [PMID: 10061903 DOI: 10.1103/physrevlett.77.2276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Roth C, Sürgers C, Löhneysen H. Electronic transport and Kondo effect in La1-xCex films. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:3454-3461. [PMID: 9986246 DOI: 10.1103/physrevb.54.3454] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Mydosh JA, Yanson IK. Size-dependence study of the spin glass CuMn (1%). PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:15106-15112. [PMID: 9983308 DOI: 10.1103/physrevb.53.15106] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Sorensen ES, Affleck I. Scaling theory of the Kondo screening cloud. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:9153-9167. [PMID: 9982417 DOI: 10.1103/physrevb.53.9153] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Újsághy O, Zawadowski A, Gyorffy BL. Spin-orbit-induced magnetic anisotropy for impurities in metallic samples of reduced dimensions: Finite size dependence in the Kondo effect. PHYSICAL REVIEW LETTERS 1996; 76:2378-2381. [PMID: 10060682 DOI: 10.1103/physrevlett.76.2378] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Giordano N. Magnetoresistance of small Kondo systems. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:2487-2491. [PMID: 9983752 DOI: 10.1103/physrevb.53.2487] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Blachly MA, Giordano N. Kondo effect in systems of reduced dimensionality. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:12537-12550. [PMID: 9978025 DOI: 10.1103/physrevb.51.12537] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Yanson IK, Fisun VV, Hesper R, Khotkevich AV, Krans JM, Mydosh JA. Size dependence of Kondo scattering in point contacts. PHYSICAL REVIEW LETTERS 1995; 74:302-305. [PMID: 10058354 DOI: 10.1103/physrevlett.74.302] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Lane KR, Park M, Isaacson MS, Parpia JM. Use of finite size and applied magnetic field to characterize the interimpurity interaction in a spin glass. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:945-953. [PMID: 9978244 DOI: 10.1103/physrevb.51.945] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Meir Y, Wingreen NS. Spin-orbit scattering and the Kondo effect. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:4947-4950. [PMID: 9976819 DOI: 10.1103/physrevb.50.4947] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Chandrasekhar V, Santhanam P, Penebre NA, Webb RA, Vloeberghs H, Bruynseraede Y. Absence of size dependence of the Kondo resistivity. PHYSICAL REVIEW LETTERS 1994; 72:2053-2056. [PMID: 10055776 DOI: 10.1103/physrevlett.72.2053] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Blachly MA, Giordano N. Kondo effect in Cu(Fe) films. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:6788-6793. [PMID: 10009401 DOI: 10.1103/physrevb.49.6788] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Palstra TT, Steigerwald ML, Ramirez AP, Kwon Y, Stuczynski SM, Schneemeyer LF, Waszczak JV, Zaanen J. Electron correlations on a mesoscopic scale: Magnetic properties of transition metal telluride cluster compounds. PHYSICAL REVIEW LETTERS 1993; 71:1768-1771. [PMID: 10054493 DOI: 10.1103/physrevlett.71.1768] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Andreani LC, Beck H. Two-impurity Anderson model: A variational study. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:7322-7337. [PMID: 10006898 DOI: 10.1103/physrevb.48.7322] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Giordano N, Pennington MA. Two-dimensional weak localization in combined perpendicular and parallel magnetic fields. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:9693-9705. [PMID: 10005040 DOI: 10.1103/physrevb.47.9693] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Blachly MA, Giordano N. Kondo effect in one-dimensional Au(Fe). PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:2951-2957. [PMID: 10003988 DOI: 10.1103/physrevb.46.2951] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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DiTusa JF, Lin K, Park M, Isaacson MS, Parpia JM. Finite-size effects in the low-temperature resistivity of CuCr films. PHYSICAL REVIEW LETTERS 1992; 68:678-681. [PMID: 10045962 DOI: 10.1103/physrevlett.68.678] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Bergmann G. Critical size of small particles for the development of resonances. PHYSICAL REVIEW LETTERS 1991; 67:2545-2548. [PMID: 10044453 DOI: 10.1103/physrevlett.67.2545] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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