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3301. LPCBC: Abstract 2_33
V.N. Kopylov, T.G. Togonidze, P.H. Kes, N.N. Kolesnikov, T.W. Li. Fluctuation effects and critical fields of Tl 2 Ba 2 CuO 6+x . Abstract: . A new approach for determination of dH c2 /dT in vicinity of T c has been suggested. Derivatives of critical fields on temperature have been found from measurements of magnetization of Tl 2 Ba 2 CuO 6+x single crystals with various T c .
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Ссылки http://www.issp.ac.ru/lpcbc/ABST/2_33.html -- 2.1 Кб -- 24.12.1999
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3302. LPCBC: Abstract, 2_3
... Structure of superconducting single crystals of (2201) thallium cuprate (Tl 1.85 Cu 0.15 )Ba 2 CuO 6 , T c =110 K. Abstract: . Single crystals of 2201 phase with various superconducting transition temperatures ranging from nonsuperconducting to 110 K have been obtained. ... A correlation between the structure and properties of Tl-2201 cuprate crystals has been established on the basis of our data and the data reported in the literature ...
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Ссылки http://www.issp.ac.ru/lpcbc/ABST/2_3.html -- 2.6 Кб -- 24.12.1999
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3303. LPCBC: Abstract 2_30
... T emperature dependence of surface impedance of Tl 2 Ba 2 CaCuO 8- d and YBa 2 Cu 3 O 6.95 single crystals measured in the microwave band. Abstract: . The real part R s and the imaginary part X s of the surface impedance Z s =R s +iX s of Tl 2 Ba 2 CaCuO 8- d and YBa 2 Cu 3 O 6.95 single crystals have been measured with high precision at frequency w/2p= 9.4 GHz in the temperature range 0< T< 140 K. In the Tl 2 Ba 2 CaCuO 8- d . ... A formula describing the curve of . ...
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Ссылки http://www.issp.ac.ru/lpcbc/ABST/2_30.html -- 4.2 Кб -- 24.12.1999
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3304. LPCBC: Abstract, 2_28
... On a possible reason of T c suppression with oxygen doping in Tl 2 Ba 2 CuO 6+x. Abstract: . Magnetic susceptibility and 63 Cu and 205 Tl nuclear spin-lattice relaxation rates have been measured in Tl 2 Ba 2 CuO 6+x high- temperature superconductor to establish the mechanism of decreasing the transition temperature with oxygen doping. The experiments have revealed the presence of localized paramagnetic centers (LPC) whose concentration grown with increasing oxygen content. ...
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Ссылки http://www.issp.ac.ru/lpcbc/ABST/2_28.html -- 2.5 Кб -- 24.12.1999
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3305. LPCBC: Abstract 2_29
... Electronic Raman scattering in the single - CuO 2 layered superconductor Tl 2 Ba 2 CuO 6+ d . ... Electronic Raman scattering in Tl 2 Ba 2 CuO 6+ d (Tl-2201) has been investigated in order to test whether the scattering cross section in high-temperature superconductors depends on the number of CuO 2 planes, i.e., sheets specific details of the Fermi surface. ... The peak in the B 1g symmetry component of the scattering intensity is found at 460 cm -1 ( T c = 90 K), or 430 cm -1 ( T c = 80 K). ...
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Ссылки http://www.issp.ac.ru/lpcbc/ABST/2_29.html -- 3.4 Кб -- 24.12.1999
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3306. LPCBC: Abstract 2_26
... We report on a study of the infrared properties of Bi 2 Sr 2 CaCu 2 O 8+ d , Bi 1.66 Pb 0.34 Sr 2 CaCu 2 O 8+ d , and Tl 2 Ba 2 CuO 6+ d crystals at doping levels from underdoped to strongly overdoped. ... While we observe a normal-state gaplike depression in 1/ t ( w , T ) in the underdoped regime, it is not observed in the overdoped regime. While the high-frequency 1/ t ( w , T ) is temperature independent in the underdoped regime, it scales with temperature in the overdoped regime. ...
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Ссылки http://www.issp.ac.ru/lpcbc/ABST/2_26.html -- 2.7 Кб -- 24.12.1999
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3307. LPCBC: Abstract 2_27
... Resonance Raman study of superconducting gap and low energy excitations in Tl 2 Ba 2 CuO 6+ d superconductors. Abstract: . ... The resonance profiles of the 2 D peak and the continuum show similar and strong resonances towards the 3.4 eV optical absorption peak in both crystals, which indicates that (1) the 2 D peak and the continuum are coupled to light scattering by the same mechanism, and (2) the light scattering mechanism for both features involves the 3.4 eV optical absorption process. ...
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Ссылки http://www.issp.ac.ru/lpcbc/ABST/2_27.html -- 2.7 Кб -- 24.12.1999
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3308. LPCBC: Abstract, 2_23
... Electronic Raman scattering of Tl-2201 and Tl-2223 and the symmetry of the energy gap. Abstract: . The high temperature superconductors Tl 2 Ba 2 CuO 6+ d (Tl-2201) and Tl 2 Ba 2 Ca 2 Cu 3 O 10 (Tl-2223) with one and three CuO 2 planes were investigated by Raman scattering in order to see whether the electronic Raman scattering cross-section depends on the number of CuO 2 planes, i.e. sheets of the Fermi surface. ...
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Ссылки http://www.issp.ac.ru/lpcbc/ABST/2_23.html -- 3.7 Кб -- 24.12.1999
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3309. LPCBC: Abstract 2_24
... Optical conductivity of high Tc superconductors: from underdoped to overdoped. Abstract: . ... While in the underdoped regime the doping-induced changes in s(w) can be well described by an increasing density of mobile carriers, in the overdoped regime there is no evidence for such an increase. Our results are not consistent with the usual view on the overdoped regime where reduction of T c is associated with an increase in the density of mobile charge carriers. ...
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Ссылки http://www.issp.ac.ru/lpcbc/ABST/2_24.html -- 2.4 Кб -- 24.12.1999
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3310. LPCBC: Abstract 2_25
... Field dependent thermal conductivity of Tl 2 Ba 2 CuO 6 : evidence for Andreev scattering of quasiparticles. Abstract: . We have studied the thermal conductivity of Tl 2 Ba 2 CuO 6 (Tl-2201) crystals as functions of temperature and magnetic field. A thermal conductivity peak is observed near 0.6 T c which is greatly reduced on application of a magnetic field along the c axis. ... A model based on Andreev reflection by vortex screening currents is shown to be consistent with these results. ...
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Ссылки http://www.issp.ac.ru/lpcbc/ABST/2_25.html -- 2.6 Кб -- 24.12.1999
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3311. LPCBC: Abstract, 2_21
... Comparative study of Tl-2201 single crystals with T c =30 and 110 K by means of X-ray structural analysis and NMR. Abstract: . The crystal structure of a tetragonal single crystal of Tl-2201 with T c =30 K has been determined by the X-ray diffraction technique ( a = 3.8717(3), c = 23.224(3) Angstrom, space group I4/mmm, Z = 2). The chemical composition is found to be Tl 1.90(1) Cu 0.10(1) Ba 2 CuO 6.18(4) . ... Structural parameters of Tl-2201 cuprates with various T c have been compared. ...
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Ссылки http://www.issp.ac.ru/lpcbc/ABST/2_21.html -- 2.6 Кб -- 24.12.1999
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3312. LPCBC: Abstract 2_22
... Pinning of Josephson vortices in single crystals of Tl 2 Ba 2 CuO 6+ d superconductors. Abstract: . Magnetic hysteresis measurements are performed on single crystals of Tl 2 Ba 2 CuO 6+ d superconductors with field parallel to the ab -plane. ... For samples with high transition temperatures, the magnetization undergoes abrupt changes as a function of field at low temperatures. ...
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Ссылки http://www.issp.ac.ru/lpcbc/ABST/2_22.html -- 2.9 Кб -- 24.12.1999
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3313. LPCBC: Abstract 2_19
... Thermalconductivity of single crystal Tl 2 Ba 2 CuO 6 (Tl-2201) in Applied magnetic fields. Abstract: . We report the dependence of the thermal conductivity k(H,T) of single crystal Tl-2201 samples on both magnetic field and temperature. The sample have a superconducting phase transition temperature Tc=86K. We develop a two component method to analyze the magnetic field dependence of thermal conductivity. ...
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Ссылки http://www.issp.ac.ru/lpcbc/ABST/2_19.html -- 2.3 Кб -- 24.12.1999
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3314. LPCBC: Abstract, 2_20
... Transition from strong to weak coupling regime with lowering T c in Tl 2 Ba 2 CuO 6+x. Abstract: . Using 205 Tl NMR, the changes in electronic properties in the normal and superconducting state of the Tl 2 Ba 2 CuO 6+x compound associated with variation of T c , are studied in samples with T c =30, 100, and 115K. Decreasing T c with oxygen doping is shown to be associated with the growth of the static electron spin susceptibility and with lowering the D/ T c ratio ( D is superconducting gap). ...
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Ссылки http://www.issp.ac.ru/lpcbc/ABST/2_20.html -- 2.4 Кб -- 24.12.1999
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3315. LPCBC: Abstract 2_11
... Direct observation of the vortex structure in high- T c superconductors in tilted magnetic fields. Abstract: . A high-resolution Bitter technique has been used to observe an effect of tilting the external magnetic field on the flux line lattice (FLL) in Tl 2 Ba 2 CaCu 2 O 8+x single crystals. ... The reason is believed to be that the formation of the equilibrium vortex state (vortex chains) was prevented by strong pinning, revealed for our crystals by the M(t) curves. ...
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Ссылки http://www.issp.ac.ru/lpcbc/ABST/2_11.html -- 2.4 Кб -- 24.12.1999
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3316. LPCBC: Abstract, 1_15
N.N. Kolesnikov, A.A. Kolchin, D.L. Alov, Yu.N. Ivanov, A.A. Chernov, M. Schiber, H. Hermon, R.B. James, M.S. Goorsky, H. Yoon, J. Toney, B. Brunett, T.E. Schlesinger. Growth and characterization of p-type Cd 1- x Zn x Te( x = 0.2, 0.3, 0.4). Abstract: . Single crystals of p-type semi-insulating Cd 1- x Zn x Te (CZT) with x = 0.2, 0.3 and 0.4 were grown using the high-pressure vertical Bridgman method. ...
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Ссылки http://www.issp.ac.ru/lpcbc/ABST/1_15.html -- 2.5 Кб -- 24.12.1999
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3317. LPCBC: Abstract, 1_5
N.N. Kolesnikov, M.P. Kulakov and Yu.N.Ivanov. Some properties of melts of A 2 B 6 compounds. Abstract: . Devices for experimental determination of surface tension and viscosity of A 2 B 6 compound melts have been developed. Surface tension, viscosity and volume effect of crystallization of melts of a few A 2 B 6 compounds have been determined.These properties are important for practice of A 2 B 6 single crystal growth from the melt.
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Ссылки http://www.issp.ac.ru/lpcbc/ABST/1_5.html -- 2.0 Кб -- 24.12.1999
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3318. LPCBC: Abstract 2_10
... Direct study of magnetic flux penetration and trapping in HTSC. Abstract: . A method for visualization of the magnetic flux penetration and trapping in high-temperature superconductors (HTSC) using magneto-uniaxial ferrimagnetic films is described. The difference in the character of these processes in a number of materials (HTSC single crystals, films and ceramics) is studied. ... Temperature dependences of the local magnetic susceptibility are measured in different sites of the samples. ...
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Ссылки http://www.issp.ac.ru/lpcbc/ABST/2_10.html -- 2.6 Кб -- 24.12.1999
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3319. LPCBC: Abstract, 1_14
... X-ray Diffraction Effects in Defect ZnS Single Crystals. Abstract: . X-ray techniques have been used to investigate single ZnS crystals grown according to Bridgman by vertical oriented crystallization under an argon pressure of 5-6 MPa. ... Some reflections show multiple diffraction. ... The model of the multiple diffraction, based on the assumption that the effect increases when the phase invariant is equal to zero, has been considered. This model describes the experiment satisfactorily. ...
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Ссылки http://www.issp.ac.ru/lpcbc/ABST/1_14.html -- 2.2 Кб -- 24.12.1999
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3320. Helpful Astronomy Information by M.G.Gavrilov
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Ссылки http://www.issp.ac.ru/astro/ap/top.html -- 2.7 Кб -- 03.02.1999
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