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31 Mar 2008

Volume 92, Issue 13, Articles (13xxxx)

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Appl. Phys. Lett. 92, 133501 (2008); http://dx.doi.org/10.1063/1.2901684 (3 pages)

Eric Akmansoy, Emmanuel Centeno, Kevin Vynck, David Cassagne, and Jean-Michel Lourtioz
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Effect of superconductivity on the electronic transport and capacitance of La1.85Sr0.15CuO4/Nb doped SrTiO3 heterojunction

J. P. Shi, Y. G. Zhao, H. J. Zhang, and X. P. Zhang

Appl. Phys. Lett. 92, 132501 (2008); http://dx.doi.org/10.1063/1.2904628 (3 pages) | Cited 5 times

Online Publication Date: 31 March 2008

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The authors report the effect of superconductivity on the electronic transport and capacitance of La1.85Sr0.15CuO4/Nb doped SrTiO3 heterojunction. This heterojunction shows good rectifying property. With the occurrence of superconductivity, the capacitance, junction resistance, and diffusion voltage of the heterojunction show jumps, which correlate with the resistance change of La1.85Sr0.15CuO4. Analysis shows that the current-voltage behavior of the heterojunction is consistent with that of the inhomogeneous Schottky contacts. The results were discussed by considering the effect of superconductivity on the inhomogeneous heterojunction. This work is helpful for the understanding of superconductor based heterojunctions and inhomogeneous Schottky contacts.
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74.72.-h Cuprate superconductors
74.78.-w Superconducting films and low-dimensional structures
73.30.+y Surface double layers, Schottky barriers, and work functions

Two-dimensional vortex-pinning phenomena in YBa2Cu3Oy films

S. Horii, M. Takamura, M. Mukaida, A. Ichinose, K. Yamada, R. Teranishi, K. Matsumoto, R. Kita, Y. Yoshida, J. Shimoyama, and K. Kishio

Appl. Phys. Lett. 92, 132502 (2008); http://dx.doi.org/10.1063/1.2905263 (3 pages) | Cited 9 times

Online Publication Date: 1 April 2008

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Anomalous superconducting properties were demonstrated in anisotropic high-critical-temperature superconductors (HTSCs) by simultaneously introducing two different planar types of vortex-pinning centers. The nanostructure, magnetic field, and field-angle dependency of critical current properties for an a-axis-grown multilayered film consisting of superconducting and semiconducting layers were characterized. Semiconductive layers running perpendicular to CuO2 superconducting layers behave as novel two-dimensional vortex-pinning centers that reverse the typical magnetic response in the superconducting state observed for conventional HTSCs. The results indicate that the vortex behavior in nanostructured HTSCs can be controlled; therefore, significant potential exists for further improvement of the critical current properties.
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74.25.Uv Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses)
74.78.-w Superconducting films and low-dimensional structures
74.72.-h Cuprate superconductors
74.78.Na Mesoscopic and nanoscale systems
74.25.Sv Critical currents

Anomalous magnetic ordering in b-axis-oriented orthorhombic HoMnO3 thin films

T. H. Lin, C. C. Hsieh, H. C. Shih, C. W. Luo, T. M. Uen, K. H. Wu, J. Y. Juang, J.-Y. Lin, C.-H. Hsu, and S. J. Liu

Appl. Phys. Lett. 92, 132503 (2008); http://dx.doi.org/10.1063/1.2904649 (3 pages) | Cited 14 times

Online Publication Date: 1 April 2008

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Orthorhombic HoMnO3 films with well-aligned crystallographic orientations were deposited on LaAlO3(110) single crystal substrates by using pulsed laser deposition. The nearly perfect b-axis-oriented films provide the opportunity of investigating the orientation-dependent physical property of this material. The temperature dependent magnetization evidently displays an antiferromagnetic ordering near 42 K, irrespective to the direction of applied field. Furthermore, the theoretically expected lock-in transition was clearly observed at around 30 K when field was applied along the c axis and was undetectable along the a and b axes. The 30 K transition was suppressed to 26 K when the applied field increased from 100 to 500 Oe.
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75.70.Ak Magnetic properties of monolayers and thin films
68.55.J- Morphology of films
81.15.Fg Pulsed laser ablation deposition
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.50.Ee Antiferromagnetics

Partial frequency band gap in one-dimensional magnonic crystals

M. Kostylev, P. Schrader, R. L. Stamps, G. Gubbiotti, G. Carlotti, A. O. Adeyeye, S. Goolaup, and N. Singh

Appl. Phys. Lett. 92, 132504 (2008); http://dx.doi.org/10.1063/1.2904697 (3 pages) | Cited 33 times

Online Publication Date: 1 April 2008

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Collective spin wave modes propagating in an array of magnetic stripes coupled by dynamic dipole interaction are investigated by Brillouin light scattering. It is demonstrated that this structure supports propagation of discrete spin waves at any angle with respect to the stripes length. The data are interpreted using a theoretical model based on the Bloch wave approach. It is shown that, due to the one-dimensional artificial periodicity of the medium, the gaps in the spin wave spectrum are partial: the frequency passbands for propagation along the direction of periodicity overlap with the stop bands for propagation along the stripes.
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73.21.-b Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems
78.35.+c Brillouin and Rayleigh scattering; other light scattering
76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance

Metal-insulator transition, specific heat, and grain-boundary-induced disorder in Sm0.55Sr0.45MnO3

M. Egilmez, K. H. Chow, J. Jung, I. Fan, A. I. Mansour, and Z. Salman

Appl. Phys. Lett. 92, 132505 (2008); http://dx.doi.org/10.1063/1.2904699 (3 pages) | Cited 20 times

Online Publication Date: 1 April 2008

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The effects of the grain-boundary-induced lattice disorder on the resistivity, the magnetization, and the specific heat of a prototypical manganite Sm0.55Sr0.45MnO3 near half doping were investigated at temperatures near the metal-insulator transition. An increasing lattice disorder softens the magnetic phase transition from a first order phase transition into a second order transition. Furthermore, the peaks in the resistivity and specific heat are broaden and there is an increase in the charge-carrier scattering rates in the metallic and insulating states. The origin of these phenomena is discussed.
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71.30.+h Metal-insulator transitions and other electronic transitions
72.60.+g Mixed conductivity and conductivity transitions
61.72.Mm Grain and twin boundaries
75.40.Cx Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

Large carbon-isotope shift of TC in boron-doped diamond

Natalia Dubrovinskaia, Leonid Dubrovinsky, Thomas Papageorgiou, Alexey Bosak, Michael Krisch, Hans F. Braun, and Joachim Wosnitza

Appl. Phys. Lett. 92, 132506 (2008); http://dx.doi.org/10.1063/1.2906381 (3 pages) | Cited 11 times

Online Publication Date: 2 April 2008

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We report the carbon-isotope effect for boron-doped diamond (BDD). Resistive as well as specific-heat measurements reveal a 0.2 K shift in the superconducting transition temperature Tc between BDDs containing 13C and 12C. This is more than two times larger than could be expected from the mass difference by the use of the simple BCS formula in case the phenomenon is related to electron-phonon mediated superconductivity in BDD.
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74.25.Bt Thermodynamic properties
74.20.Fg BCS theory and its development
74.62.Dh Effects of crystal defects, doping and substitution
74.25.Kc Phonons

Magnetocaloric effect in melt spun Ni50.3Mn35.5Sn14.4 ribbons

B. Hernando, J. L. Sánchez Llamazares, J. D. Santos, V. M. Prida, D. Baldomir, D. Serantes, R. Varga, and J. González

Appl. Phys. Lett. 92, 132507 (2008); http://dx.doi.org/10.1063/1.2904625 (3 pages) | Cited 18 times

Online Publication Date: 2 April 2008

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We determined the magnetic entropy change and refrigerant capacity of melt spun Ni50.3Mn35.5Sn14.4 ribbons around both the structural and the magnetic transitions for a field of 20 kOe. The maximum entropy changes at the structural and magnetic transitions were of 4.1 and −1.1 J kg−1 K−1. Ribbons studied show a larger refrigerant capacity around the magnetic transition (46 J kg−1) than around the structural transition (26 J kg−1), suggesting that the temperature range at the magnetic transition is more adequate for a refrigerant cycle than that at the structural transition.
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75.30.Sg Magnetocaloric effect, magnetic cooling
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
81.30.Hd Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder
64.70.kd Metals and alloys

Particulate structure of L10 ordered ultrathin FePt films for perpendicular recording

A. Perumal, Y. K. Takahashi, T. O. Seki, and K. Hono

Appl. Phys. Lett. 92, 132508 (2008); http://dx.doi.org/10.1063/1.2830708 (3 pages) | Cited 23 times

Online Publication Date: 3 April 2008

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We report the investigation of microstructure and magnetic properties of ultrathin FePt (1–10 nm) films grown on oxidized Si substrates with a 10 nm MgO(100) intermediate layer. The isolated FePt particles with high degree of L10 ordering and large magnetocrystalline anisotropy could be fabricated with a thickness of less than 5 nm. Perpendicular coercivity of isolated FePt particles is controllable between 15 and 25 kOe. These results are promising and highly desirable for magnetic recording applications.
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75.70.Ak Magnetic properties of monolayers and thin films
75.30.Gw Magnetic anisotropy
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.50.Ss Magnetic recording materials
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