Realtime Access Map
Browsing by Author "Kurter, Cihan"
Now showing items 1-17 of 17
-
Comparison of intrinsic Josephson and SIS tunneling spectroscopy of Bi 2Sr2CaCu2O8+δ
Özyüzer, Lütfi; Kurter, Cihan; Zasadzinski, John F.; Gray, Kenneth E.; Hinks, David G.; Miyakawa, Nobuaki (IEEE, 2005-05)Tunneling spectroscopy measurements are reported on optimally-doped and overdoped Bi2Sr2Ca2Cu2O 8+δ single crystals. A novel point contact method is used to obtain superconductor-insulator-normal metal (SIN) and SIS break ... -
Counterintuitive consequence of heating in strongly-driven intrinsic junctions of Bi2 Sr2 CaCu2 O 8+δ mesas
Kurter, Cihan; Özyüzer, Lütfi; Proslier, T.; Zasadzinski, John F.; Hinks, David G.; Gray, Kenneth E. (American Physical Society, 2010-06)Anomalously high and sharp peaks in the conductance of intrinsic Josephson junctions in Bi2 Sr2 CaCu2 O 8+δ (Bi2212) mesas have been commonly interpreted as superconducting energy gaps but here we show they are a result ... -
Direct observation of tetrahertz electromagnetic waves emitted from intrinsic Josephson junctions in single crystalline Bi2Sr2CaCu2O8+δ
Kadowaki, K.; Yamaguchi, H.; Kawamata, K.; Yamamoto, T.; Minami, H.; Kakeya, I.; Welp, U.; Özyüzer, Lütfi; Koshelev, A. E.; Kurter, Cihan; Gray, Kenneth E.; Kwok, W. K. (Elsevier, 2008-04)We have observed intense, coherent, continuous and monochromatic electromagnetic (EM) emission at terahertz frequencies generated from a single crystalline mesa structure of the high-Tc superconductor Bi2Sr2CaCu2O8+δ ... -
Effect of magnetic field on quasiparticle branches of intrinsic Josephson junctions with ferromagnetic layer
Özyüzer, Lütfi; Özdemir, Mustafa; Kurter, Cihan; Hinks, David G.; Gray, Kenneth E. (Elsevier, 2007-09)The interlayer tunneling spectroscopy has been performed on micron-sized mesa arrays of HgBr2 intercalated superconducting Bi2212 single crystals. A ferromagnetic multilayer (Au/Co/Au) is deposited on top of the mesas. The ... -
Emission of coherent THz radiation from superconductors
Özyüzer, Lütfi; Koshelev, A. E.; Kurter, Cihan; Gopalsami, N.; Li, Q.; Tachiki, M.; Kadowaki, K.; Yamamoto, T.; Minami, H.; Yamaguchi, H.; Tachiki, T.; Gray, Kenneth E.; Kwok, W. K.; Welp, U. (American Association for the Advancement of Science, 2007-11)Compact solid-state sources of terahertz (THz) radiation are being sought for sensing, imaging, and spectroscopy applications across the physical and biological sciences. We demonstrate that coherent continuous-wave THz ... -
Fabrication of array of mesas on superconducting Bi2Sr 2CaCu2O8+δ single crystals
Kurter, Cihan; Özyüzer, Lütfi (National Institute of Optoelectronics, 2005-02)The superconducting properties of multi-layered high temperature superconductors (HTS) result mainly from the CuO2 planes, while the other structural components behave simply as charge reservoirs. Using these perfect-layered ... -
Fabrication of mesa structures on superconducting Bi2Sr2CaCu2O8+& single crystals
Kurter, Cihan (Izmir Institute of Technology, 2005)There have been tremendous efforts to understand the relatively much more sophisticated mechanism of superconductivity in high temperature superconductors (HTSC). In order to investigate the inherent features and tunneling ... -
The ICRN value in intrinsic Josephson tunnel Junctions in Bi2Sr2CaCu2O8+δ (Bi2212) mesas
Kurter, Cihan; Özyüzer, Lütfi; Hinks, David G.; Gray, Kenneth E.; Zasadzinski, John F. (Springer, 2011-01)The c-axis current-voltage I(V) characteristics have been obtained on a set of mesas of varying height sculpted on Bi2Sr2CaCu2O8+δ (Bi2212) crystals intercalated with HgB2. The intercalation, along with the small number ... -
Investigation of the tunneling spectra in HgBr2-intercalated Bi-2212 single crystals below and above Tc
Kurter, Cihan; Mazur, Daniel; Özyüzer, Lütfi; Hinks, David G.; Gray, Kenneth E. (Elsevier, 2007-09)Interlayer tunneling spectroscopy measurements were performed on mesa arrays of Bi-2212 single crystals, intercalated with HgBr2. Tunneling conductances were obtained over a wide temperature range to examine the spectral ... -
Large energy gaps in Ca C6 from tunneling spectroscopy: Possible evidence of strong-coupling superconductivity
Kurter, Cihan; Özyüzer, Lütfi; Mazur, Daniel; Zasadzinski, John F.; Rosenmann, Daniel; Claus, Helmut; Hinks, David G.; Gray, Kenneth E. (American Physical Society, 2007-12)Tunneling in Ca C6 crystals reproducibly reveals superconducting gaps Δ of 2.3±0.2 meV that are ∼40% larger than reported earlier. In an isotropic s -wave scenario, that puts Ca C6 into the class of very strongly coupled ... -
Modeling study of the dip-hump feature in Bi2 Sr2 CaCu2 O8+δ tunneling spectroscopy
Romano, Pierom; Özyüzer, Lütfi; Yusof, Zikri; Kurter, Cihan; Zasadzinski, John F. (American Physical Society, 2006)The tunneling spectra of high-temperature superconductors on Bi2 Sr2 CaCu2 O8+δ (Bi-2212) reproducibly show a high-bias structure in the form of a dip-hump at voltages higher than the gap voltage. Of central concern is ... -
Reply to "comment on 'Counterintuitive consequence of heating in strongly-driven intrinsic junctions of Bi 2Sr 2CaCu 2O 8+δ mesas'"
Kurter, Cihan; Özyüzer, Lütfi; Proslier, Thomas; Zasadzinski, John F.; Hinks, David G.; Gray, Kenneth E. (American Physical Society, 2011-10)The main criticism raised in the preceding Comment concerns our suggestion that sharp conduction peaks in Bi 2Sr 2CaCu 2O 8+δ mesas, along with absent dip-hump features, may, in general, be a result of self-heating. The ... -
Self-heating effect in intrinsic tunneling spectroscopy of HgBr2 intercalated Bi2.1Sr1.4Ca1.5Cu 2O8+δ single crystals
Kurter, Cihan; Özyüzer, Lütfi; Zasadzinski, John F.; Hinks, David G.; Gray, Kenneth E. (IEEE, 2007-06)We report tunneling results in intrinsic Josephson junction (IJJ) stacks fabricated in the form of square micromesas on HgBr2 intercalated Bi2.1Sr1.4Ca1.5Cu2O 8+δ (Bi2212) single crystals using photolithography and Ar ion ... -
Spin polarized and degenerate tunneling spectra in intrinsic Josephson junctions of Bi2212
Özdemir, Mustafa; Özyüzer, Lütfi; Kurter, Cihan (Wiley-VCH Verlag, 2007)Tunneling characteristics of HgBr2 intercalated superconducting Bi2212 single crystals have been obtained by using 10×10 μm2 intrinsic Josephson junction stacks, so called mesa structures. The spin degenerate current is ... -
Spin polarized current injection through HgBr2 intercalated Bi2212 intrinsic josephson junctions
Özyüzer, Lütfi; Kurter, Cihan; Özdemir, Mustafa; Zasadzinski, John F.; Gray, Kenneth E.; Hinks, David G. (IEEE, 2007-06)To investigate the effect of polarized current on tunneling characteristics of intrinsic Josephson junctions (IJJs), spin-polarized and spin-degenerate current have been injected through the c-axis of HgBr2 intercalated ... -
Terahertz wave emission from intrinsic Josephson junctions in high- Tc superconductors
Özyüzer, Lütfi; Şimşek, Yılmaz; Köseoğlu, Hasan; Türkoğlu, Fulya; Kurter, Cihan; Welp, U.; Koshelev, A. E.; Gray, Kenneth E.; Kwok, W. K.; Yamamoto, T.; Kadowaki, K.; Koval, Yu I.; Wang, Huabing; Müller, Paul H. (IOP Publishing, 2009)Recently, we experimentally demonstrated that rectangular mesa structures of intrinsic Josephson junctions (IJJ) in Bi2Sr2CaCu 2O8+d (Bi2212) can be used as a compact solid-state generator of continuous, coherent and ... -
Thermal management in large Bi2212 mesas used for terahertz sources
Kurter, Cihan; Gray, Kenneth E.; Zasadzinski, John F.; Özyüzer, Lütfi; Koshelev, A. E.; Li, Q.; Yamamoto, T.; Kadowaki, K.; Kwok, W. K.; Tachiki, M.; Welp, U. (IEEE, 2009-06)We present a thermal analysis of a patterned mesa on a Bi 2Sr2CaCu2O8 (Bi2212) single crystal that is based on tunneling characteristics of the c-axis stack of ∼800 intrinsic Josephson junctions in the mesa. Despite the ...
