Cryogenic microwave imaging of metal-insulator transition in doped silicon

Kundhikanjana, Worasom; Lai, Keji; Kelly, Michael A.; Shen, Zhi-Xun
March 2011
Review of Scientific Instruments;Mar2011, Vol. 82 Issue 3, p033705
Academic Journal
We report the instrumentation and experimental results of a cryogenic scanning microwave impedance microscope. The microwave probe and the scanning stage are located inside the variable temperature insert of a helium cryostat. Microwave signals in the distance modulation mode are used for monitoring the tip-sample distance and adjusting the phase of the two output channels. The ability to spatially resolve the metal-insulator transition in a doped silicon sample is demonstrated. The data agree with a semiquantitative finite element simulation. Effects of the thermal energy and electric fields on local charge carriers can be seen in the images taken at different temperatures and dc biases.


Related Articles

  • Design and thermal stress analysis of high-power x-ray monochromators cooled with liquid nitrogen. Rogers, C.S.; Assoufid, L. // Review of Scientific Instruments;Feb1995, Vol. 66 Issue 2, p2200 

    Presents a series of finite element analyses of an inclined, cryogenically cooled silicon monochromator for use with undulator A of the Advanced Photon Source in Argonne, Illinois. Thermal modeling of the monochromator crystal; Peak power density at normal incidence to the beam.

  • And a Good New Year to All. Armel, Anne // Process Cooling & Equipment;Jan/Feb2008, p6 

    The article discusses various reports published within the issue, including the articles "Overcoming the System Effect" and "Problem-Free Pumping of Cryogenic Liquids."

  • Helium liquefaction by a Gifford–McMahon cycle cryogenic refrigerator. Yoshimura, Hideto; Nagao, Masashi; Inaguchi, Takashi; Yamada, Tadatoshi; Iwamoto, Masatami // Review of Scientific Instruments;Nov89, Vol. 60 Issue 11, p3533 

    This article describes the principal design features and performance test results of a three-stage Gifford–McMahon cycle cryogenic refrigerator by which the authors have achieved a no-load temperature of 3.3 K and succeeded in helium liquefaction. The refrigeration capacity was 20 mW at...

  • Terahertz composite right-left handed transmission-line metamaterial waveguides. Liu, Zhijun; Hon, Philip W. C.; Tavallaee, Amir A.; Itoh, Tatsuo; Williams, Benjamin S. // Applied Physics Letters;2/13/2012, Vol. 100 Issue 7, p071101 

    We report terahertz metamaterial waveguides based on the concept of composite right/left-handed transmission-lines. The waveguides are implemented in a metal-insulator-metal geometry fabricated with spin-coated Benzocyclobutene and contact photolithography. Angle-resolved reflection spectroscopy...

  • Increased dissipation from distributed etch holes in a lateral breathing mode silicon micromechanical resonator. Tu, Cheng; Lee, Joshua E.-Y. // Applied Physics Letters;7/9/2012, Vol. 101 Issue 2, p023504 

    Etch holes are commonly used design features when fabricating silicon-on-insulator micromechanical resonators to realize free standing structures. This paper shows that including etch-holes in a square-extensional mode resonator results in marked reduction of quality factor (Q) by 75%. The cause...

  • Enhanced metal-insulator transition and magnetoresistance in melt-processed La[sub 0.67]Ca[sub 0.33]MnO[sub 3] and Ho-doped manganites. Pradhan, A. K.; Roul, B. K.; Feng, Y.; Wu, Y.; Mohanty, S.; Sahu, D. R.; Dutta, P. // Applied Physics Letters;3/12/2001, Vol. 78 Issue 11, p1598 

    We report significant enhancement of magnetoresistance (MR) in melt-processed La[sub 0.67]Ca[sub 0.33]MnO[sub 3] (LCM) and in Ho-doped LCM samples. The LCM system exhibits surprising enhancement of metal-insulator transition (T[sub IM]) that coincides with the Curie transition temperature (T[sub...

  • Metal-insulator transition in n-3 C-SiC epitaxial films. Lebedev, A. A.; Abramov, P. L.; Agrinskaya, N. V.; Kozub, V. I.; Kuznetsov, A. N.; Lebedev, S. P.; Oganesyan, G. A.; Tregubova, A. S.; Chernyaev, A. V.; Shamshur, D. V.; Skvortsova, M. O. // Semiconductors;Mar2009, Vol. 43 Issue 3, p318 

    n-Type 3 C-SiC films have been grown by sublimation epitaxy on hexagonal silicon carbide substrates. The low-temperature conductivity and magnetoresistance of the films have been studied in relation to their doping level and structural perfection. It was found that a metal-insulator transition...

  • The fundamentals of low-temperature silver brazing - Part 5: Induction and resistance heating. Roberts, P. M. // Welding & Cutting;2012, Issue 4, p220 

    The article focuses on induction and resistance heating methods, which are characterised by the benefit of closely localised heating of the joint area. It notes that the use of both methods will produce efficient results when use in restricted cases where their technical characteristics may be...

  • Streamline upwind finite element method using 6-node triangular element with adaptive remeshing technique for convective-diffusion problems. Wansophark, Niphon; Dechaumphai, Pramote // Applied Mathematics & Mechanics;Nov2008, Vol. 29 Issue 11, p1439 

    A streamline upwind finite element method using 6-node triangular element is presented. The method is applied to the convection term of the governing transport equation directly along local streamlines. Several convective-diffusion examples are used to evaluate efficiency of the method. Results...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics