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24 Nov 2008

Volume 93, Issue 21, Articles (21xxxx)

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Appl. Phys. Lett. 93, 214101 (2008); http://dx.doi.org/10.1063/1.3025819 (3 pages)

Brian Abbey, Garth J. Williams, Mark A. Pfeifer, Jesse N. Clark, Corey T. Putkunz, Angela Torrance, Ian McNulty, T. M. Levin, Andrew G. Peele, and Keith A Nugent
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Ferromagnetic spin-correlations in strained LaCoO3 thin films

J. W. Freeland, J. X. Ma, and J. Shi

Appl. Phys. Lett. 93, 212501 (2008); http://dx.doi.org/10.1063/1.3027063 (3 pages) | Cited 6 times

Online Publication Date: 24 November 2008

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We present an element-resolved study of the valence and magnetic properties of LaCoO3 thin films grown via pulsed laser deposition. The Co L edge x-ray absorption shows that ferromagnetic (FM) order arises from a slight hole doping of the system presumably due to nonstoichiometry, which in the bulk system disrupts the low-spin state. However, even though the films are hole doped, the magnetic moments under tensile strain are much larger than the bulk system indicating that the strain can greatly increase the FM fraction observed in the spin-glass regime at low doping.
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75.70.Ak Magnetic properties of monolayers and thin films
78.70.Dm X-ray absorption spectra
68.55.Ln Defects and impurities: doping, implantation, distribution, concentration, etc.
75.30.Cr Saturation moments and magnetic susceptibilities
81.15.Fg Pulsed laser ablation deposition
75.50.Dd Nonmetallic ferromagnetic materials

Bias-dependent rectifying properties of n-n manganite heterojunctions La1−xCaxMnO3/SrTiO3:Nb (x = 0.65–1)

W. M. Lü, J. R. Sun, D. J. Wang, Y. W. Xie, S. Liang, Y. Z. Chen, and B. G. Shen

Appl. Phys. Lett. 93, 212502 (2008); http://dx.doi.org/10.1063/1.3021399 (3 pages) | Cited 3 times

Online Publication Date: 24 November 2008

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The transport property of n-n type manganite heterojunctions, composed of La1−xCaxMnO3 films (x = 0.6, 0.75, 0.85, and 1) and 0.05 wt % Nb-doped SrTiO3, has been experimentally studied. Different from p-n junctions, the rectifying behavior of which is either thermionic emission/diffusion-dominated or tunneling-dominated; the electronic process in the n-n junction undergoes a nonthermal to thermal transition as bias voltage increases, which is a feature emerging when Ca content exceeds x = 0.75 and developing with the increase in x. The two processes can be well described by the Shockley equation and the Newman equation, respectively. Possible mechanisms for this phenomenon are discussed.
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73.40.Lq Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions
79.40.+z Thermionic emission
73.40.Ei Rectification
66.30.H- Self-diffusion and ionic conduction in nonmetals
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

Pseudogap formation in the metallic state of La0.7Sr0.3MnO3 thin films

Udai Raj Singh, Anjan K. Gupta, Goutam Sheet, Venkat Chandrasekhar, H. W. Jang, and C. B. Eom

Appl. Phys. Lett. 93, 212503 (2008); http://dx.doi.org/10.1063/1.3028072 (3 pages) | Cited 6 times

Online Publication Date: 24 November 2008

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We report on scanning tunneling microscopy and spectroscopy (STM/S) studies of epitaxial La0.7Sr0.3MnO3 (LSMO) thin films on a lattice matched (001) La0.3Sr0.7Al0.35Ta0.35O9 substrate for both as-grown and annealed films. In contrast to the as-grown films, the films annealed at 800 °C in air show atomic terraces with spectra that develop a gaplike structure with cooling. We show that the gap structure can be attributed to the predicted pseudogap in the manganites. Unlike several previous reports, we did not find electronic inhomogeneities in LSMO by STM/S.
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71.20.Ps Other inorganic compounds
68.37.Ef Scanning tunneling microscopy (including chemistry induced with STM)

Characterization of complementary electric field coupled resonant surfaces

Thomas H. Hand, Jonah Gollub, Soji Sajuyigbe, David R. Smith, and Steven A. Cummer

Appl. Phys. Lett. 93, 212504 (2008); http://dx.doi.org/10.1063/1.3037215 (3 pages) | Cited 9 times

Online Publication Date: 26 November 2008

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We present angle-resolved free-space transmission and reflection measurements of a surface composed of complementary electric inductive-capacitive (CELC) resonators. By measuring the reflection and transmission coefficients of a CELC surface with different polarizations and particle orientations, we show that the CELC only responds to in-plane magnetic fields. This confirms the Babinet particle duality between the CELC and its complement, the electric field coupled LC resonator. Characterization of the CELC structure serves to expand the current library of resonant elements metamaterial designers can draw upon to make unique materials and surfaces.
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84.40.Az Waveguides, transmission lines, striplines
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