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Oct 2010

Volume 81, Issue 10, Articles (10xxxx)

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back to top Condensed Matter; Materials

Stabilization of sample temperature in a surface-science vacuum chamber to 0.03 K and quartz-crystal microbalance frequency to 0.06 Hz over 0.5 h

Alan J. Slavin

Rev. Sci. Instrum. 81, 103901 (2010); http://dx.doi.org/10.1063/1.3488368 (5 pages)

Online Publication Date: 19 October 2010

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Improvements have been made to a high-stability quartz-crystal microbalance for use in a typical surface-science, ultrahigh vacuum chamber, with a frequency stability of one part in 108 (0.06 Hz) over 0.5 h. This gives a resolution equivalent to 2% of an atomic monolayer of oxygen over 0.5 h. The quartz-crystal microbalance (QCM) crystal can be rotated to different surface-analysis positions in the chamber. These characteristics open up the combination of surface and bulk adsorption studies on the same sample without transferring the sample to another chamber. To accomplish this, it was necessary to stabilize the sample temperature to ±0.03 K over several hours. The oscillator performance is illustrated by the uptake of oxygen by a gold-plated QCM crystal.
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42.70.Ce Glasses, quartz
06.30.Dr Mass and density
06.30.Ft Time and frequency

Circularly polarized luminescence microscopy for the imaging of charge and spin diffusion in semiconductors

I. Favorskiy, D. Vu, E. Peytavit, S. Arscott, D. Paget, and A. C. H. Rowe

Rev. Sci. Instrum. 81, 103902 (2010); http://dx.doi.org/10.1063/1.3493047 (4 pages) | Cited 1 time

Online Publication Date: 21 October 2010

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Room temperature electronic diffusion is studied in 3 μm thick epitaxial p+ GaAs lift-off films using a novel circularly polarized photoluminescence microscope. The method is equivalent to using a standard optical microscope and provides a contactless means to measure both the charge (L) and spin (Ls) diffusion lengths simultaneously. The measured values of L and Ls are in excellent agreement with the spatially averaged polarization and a sharp reduction in these two quantities (L from 21.3 to 1.2 μm and Ls from 1.3 to 0.8 μm) is found with increasing surface recombination velocity. Outward diffusion results in a factor of 10 increase in the polarization at the excitation spot. The range of materials to which the technique can be applied, as well as a comparison with other existing methods for the measurement of spin diffusion, is discussed.
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78.66.Fd III-V semiconductors
72.20.Jv Charge carriers: generation, recombination, lifetime, and trapping
73.50.Gr Charge carriers: generation, recombination, lifetime, trapping, mean free paths
78.55.Cr III-V semiconductors

Development of a synchrotron biaxial tensile device for in situ characterization of thin films mechanical response

G. Geandier, D. Thiaudière, R. N. Randriamazaoro, R. Chiron, S. Djaziri, B. Lamongie, Y. Diot, E. Le Bourhis, P. O. Renault, P. Goudeau, A. Bouaffad, O. Castelnau, D. Faurie, and F. Hild

Rev. Sci. Instrum. 81, 103903 (2010); http://dx.doi.org/10.1063/1.3488628 (8 pages) | Cited 3 times

Online Publication Date: 21 October 2010

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We have developed on the DIFFABS-SOLEIL beamline a biaxial tensile machine working in the synchrotron environment for in situ diffraction characterization of thin polycrystalline films mechanical response. The machine has been designed to test compliant substrates coated by the studied films under controlled, applied strain field. Technological challenges comprise the sample design including fixation of the substrate ends, the related generation of a uniform strain field in the studied (central) volume, and the operations from the beamline pilot. Preliminary tests on 150 nm thick W films deposited onto polyimide cruciform substrates are presented. The obtained results for applied strains using x-ray diffraction and digital image correlation methods clearly show the full potentialities of this new setup.
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29.20.dk Synchrotrons
68.60.Bs Mechanical and acoustical properties
68.55.-a Thin film structure and morphology

Method for cooling nanostructures to microkelvin temperatures

A. C. Clark, K. K. Schwarzwälder, T. Bandi, D. Maradan, and D. M. Zumbühl

Rev. Sci. Instrum. 81, 103904 (2010); http://dx.doi.org/10.1063/1.3489892 (4 pages) | Cited 2 times

Online Publication Date: 25 October 2010

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We propose a new scheme aimed at cooling nanostructures to microkelvin temperature based on the well established technique of adiabatic nuclear demagnetization: we attach each device measurement lead to an individual nuclear refrigerator, allowing efficient thermal contact to a microkelvin bath. On a prototype consisting of a parallel network of nuclear refrigerators, temperatures of ∼ 1 mK simultaneously on ten measurement leads have been reached upon demagnetization, thus completing the first steps toward ultracold nanostructures.
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07.20.Mc Cryogenics; refrigerators, low-temperature detectors, and other low-temperature equipment
14.20.Dh Protons and neutrons
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