Scanning-tunneling microscopy/spectroscopy and break-junction tunneling spectroscopy of FeSe1-xTex

Ekino, T.; Sugimoto, A.; Gabovich, A. M.
March 2013
Low Temperature Physics;Mar2013, Vol. 39 Issue 3, p265
Academic Journal
The iron-chalcogenide superconductor FeSe1-xTex (0.5 < x < 1) was investigated by scanning-tunneling microscopy/spectroscopy (STM/STS) and break-junction techniques. In the STM topography of the samples, randomly distributed Te and Se surface atomic structure patterns correlate well with the bulk composition, demonstrating that nanoscale surface features directly reflect bulk properties. The high-bias STS measurements clarified the gap-like structure at ≈100-300 meV, which is consistent with the break-junction data. These high-energy structures were also found in sulfur substituted FeSe0.1Te0.9. Possible origin of such spectral peculiarities is discussed. The superconducting gap 2Δ ≈ 3.4 ± 0.2 meV at temperature T = 4.2 K was found in the break junction of FeSe1-xTex with the critical temperature Tc ≈ 10 K. The corresponding characteristic gap to Tc ratio 2Δ/kBTc ≈ 4 ± 0.2 indicates moderate superconducting coupling (kB is the Boltzmann constant).


Related Articles

  • Theoretical Study on the Upper Critical Field of a Layered Superconductor NbSe $$_2$$. Huang, Hai; Liu, Peng; Lv, Peng-Li; Li, Ning // Journal of Low Temperature Physics;Dec2014, Vol. 177 Issue 5/6, p217 

    Based on two-band Ginzburg-Landau theory, we study the temperature and angular dependences of the upper critical field for superconducting NbSe $$_2$$ crystals. We introduce two variational parameters in our approach, and provide the explicit equations to determine the upper critical field in...

  • Energy-gap spectroscopy of superconductors using a tunneling microscope. Le Duc, H. G.; Kaiser, W. J.; Stern, J. A. // Applied Physics Letters;6/29/1987, Vol. 50 Issue 26, p1921 

    A unique scanning tunneling microscope (STM) system has been developed for spectroscopy of the superconducting energy gap. High-resolution control of tunnel current and voltage allows for measurement of superconducting properties at tunnel resistance levels 102–103 greater than that...

  • Learning about High-T... Superconductors from Their Imperfections. Levi, Barbara Goss // Physics Today;Mar2000, Vol. 53 Issue 3, p17 

    Illustrates the unique potentials of scanning tunneling microscope (STM) for explorations of the superconducting state at the atomic level. Discoveries of the STM image; Role of impurities in high-temperature superconductivity; Details on the process of development.

  • Tunneling Spectroscopy On Partially Deuterated κ-(BEDT-TTF)2Cu[N(CN)2]Br By STM. Ichimura, Koichi; Nomura, Kazushige; Kawamoto, Atsushi // AIP Conference Proceedings;2006, Vol. 850 Issue 1, p607 

    The superconducting phase of organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br was studied by the electron tunneling using STM. Tunneling spectra were obtained at partially deuterated κ-(BEDT-TTF-d[3,3])2Cu[N(CN)2]Br. The tunneling conductance curve exhibits clear superconducting gap...

  • Scanning Tunneling Microscopy and Spectroscopy of Sr2RuO4. Kambara, H.; Niimi, Y.; Takizawa, K.; Yaguchi, H.; Maeno, Y.; Fukuyama, Hiroshi // AIP Conference Proceedings;2006, Vol. 850 Issue 1, p539 

    We report scanning tunneling microscopy/spectroscopy (STM/STS) studies of the spin-triplet superconductor Sr2RuO4 at temperatures down to 30 mK and in magnetic fields up to 6 T. Clean sample surfaces were prepared by cleaving the single crystals along the ab plane at 100 K in an ultrahigh vacuum...

  • Electronic inhomogeneity as a function of out-of-plane disorder in Ln-doped Bi2201 superconductors. Sugimoto, A.; Kashiwaya, S.; Eisaki, H.; Kashiwaya, H.; Tsuchiura, H.; Tanaka, Y.; Fujita, K.; Uchida, S. // AIP Conference Proceedings;2006, Vol. 850 Issue 1, p507 

    The local electronic properties of Bi2Sr1.6Ln0.4CuO6+y, (Ln = La, Gd) is investigated by scanning tunneling microscopy/spectroscopy (STM/STS). As increasing the magnitude of out-of-plane disorder by increasing the mismatch of Ln-ion doping, enlargement of deviation of Δ (σΔ) is...

  • Scanning Tunneling Microscopy and Spectroscopy on La1.68Nd0.2Sr0.12CuO4. Saito, Ryo; Noguchi, Tetsuro; Pyon, Tesu; Kato, Takuya; Sakata, Hideaki // AIP Conference Proceedings;2006, Vol. 850 Issue 1, p425 

    We report the results of scanning tunneling microscopy and spectroscopy measurements on La1.68Nd0.2Sr0.12CuO4 single crystal with Tc = 13 K. A topographic image has revealed a narrow terrace structure on a surface prepared at 4.2 K. An observed superconducting gap value 2Δ has been...

  • Distribution of the Impurity Resonance Energy in BiSrCaCuO Observed by Scanning Tunneling Spectroscopy. Nakamura, H.; Machida, T.; Iguchi, M.; Yamasaki, T.; Kaneko, A.; Kariya, H.; Morohoshi, D.; Ooi, S.; Mochiku, T.; Hirata, K.; Hasegawa, T.; Sakata, H. // Journal of Superconductivity & Novel Magnetism;Aug2013, Vol. 26 Issue 8, p2633 

    Using scanning tunneling microscopy and spectroscopy (STM/STS) at 4.2 K, we observed Zn impurity resonance states in single crystals of Zn substituted BiSrCa(CuZn)O. Zn impurity resonances were characterized by the peak structure in the local density of states (LDOS). The peaks were appeared...

  • Existence of Pseudogap at the Transition Temperature of an Electron-Doped Copper-Oxide Superconductor. Kunwar, Shankar // Journal of Superconductivity & Novel Magnetism;Nov2014, Vol. 27 Issue 11, p2461 

    We present the scanning tunnelling spectroscopy (STS) studies of the energy gap (Δ) at the Fermi surface of electron-doped high-temperature (high-T) cuprate superconductor Pr LaCe CuO, which is commonly known as PLCCO. We found that the energy gap does not vanish at the transition...


Read the Article


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

Try another library?
Sign out of this library

Other Topics