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Browsing by Author "Şimşek, Yılmaz"
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Effects of physical growth conditions on the structural and optical properties of sputtered grown thin HfO2 films
Aygün, Gülnur; Cantaş, Ayten; Şimşek, Yılmaz; Turan, Raşit (Elsevier, 2011-06)HfO2 thin films were prepared by reactive DC magnetron sputtering technique on (100) p-Si substrate. The effects of O2/Ar ratio, substrate temperature, sputtering power on the structural properties of HfO2 grown films were ... -
Emission of the THz waves from large area mesas of superconducting Bi 2Sr2CaCu2O8+δ by the injection of spin polarized current
Türkoğlu, Fulya; Özyüzer, Lütfi; Köseoğlu, Hasan; Demirhan, Yasemin; Preu, S.; Malzer, S.; Şimşek, Yılmaz; Wang, Huabing; Muller, P. (Elsevier, 2013)Rectangular Au/Co/Au/Bi2Sr2CaCu2O 8+δ (Bi2212) mesa structures with large areas and high thicknesses were fabricated on as-grown Bi2212 single crystals in order to obtain small critical current from as-grown mesas by the ... -
The fabrication of THz emitting mesas by reactive ion-beam etching of superconducting Bi2212 with multilayer masks
Köseoğlu, Hasan; Türkoğlu, Fulya; Şimşek, Yılmaz; Özyüzer, Lütfi (SpringerLink, 2011-01)Generation of powerful THz radiation from intrinsic Josephson Junctions (IJJs) of Bi2Sr2CaCu2O8+δ (Bi2212) may require mesas with large lateral dimensions. However, there are difficulties in fabrication of perfect rectangular ... -
Temperature dependence of electrical conductivity in double-wall and multi-wall carbon nanotube/polyester nanocomposites
Şimşek, Yılmaz; Özyüzer, Lütfi; Seyhan, Abdullah Tuğrul; Tanoğlu, Metin; Schulte, Karl (Springer, 2007-12)The aim of this study is to investigate temperature dependence of electrical conductivity of carbon nanotube (CNT)/polyester nanocomposites from room temperature to 77 K using four-point probe test method. To produce ... -
Temperature dependence of tunneling in intrinsic Josephson junctions of high temperature superconductors
Şimşek, Yılmaz (Izmir Institute of Technology, 2008)The lack of coherent, continuous and tunable compact solid-state sources of electromagnetic radiations at terahertz (THz) frequency range (0.3-30 THz) can be solved by high temperature superconductors (HTS) which are better ... -
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 ... -
Terahertz wave emission from layered superconductors: Interferometer measurements
Özyüzer, Lütfi; Türkoğlu, Fulya; Demirhan, Yasemin; Köseoğlu, Hasan; Preu, S.; Ploss, D.; Malzer, S.; Şimşek, Yılmaz; Wang, Huabing; Müller, P. (IEEE, 2011)Rectangular Bi2Sr2CaCu2O 8+δ (Bi2212) mesa structures were fabricated on as-grown Bi2212 single crystal superconductors using standard photolithography and Ar ion beam etching techniques. We have performed c-axis resistance ...
