Spin-lattice relaxation, NQR 63Cu and NMR 205Tl in Tl2Ba2CuO6+δ

Alekseevskiǐ, N. E.; Nikolaev, E. G.; Mitin, A. V.; Хлыбов, Е. П.; Zhdanov, Yu. I.; Aleksashin, B. A.; Mikhaljov, K.N.; Verkhovskii, S.; Lavrentjev, V.V.; Medvedev, E. Yu.

doi:10.1016/0921-4534(92)90754-z

Cited by 14 publications

(4 citation statements)

References 15 publications

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“…It is remarkable that Z(0) is fairly temperamre independent (Pauli like) in the highly doped state (YBCO7), whereas it decreases in absolute value and decreases with decreasing temperature in the partially doped states (YBCO (124)). This phenomenon has been observed in a number of cases by 63Cu, 170, 89y (see contributions [9,11,12,55] and 2~ NMR [28,56,[62][63][64][65][66][67]). The decrease in absolute value with smaller hole concentration can possibly be interpreted in terms of a reduced density of states.…”

Section: Knight Shift and The Static Susceptibilitymentioning

confidence: 99%

What does NMR tell us about the electronic state of high-T c superconductors?

Mehring

1992

Appl. Magn. Reson.

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An introduction to the models which are usually applied, when interpreting the NMR (nuclear magnetic resonance) parameter Knight shift (Ks) and spin-lattice relaxation rate 1/T~ in the normal and the superconducting state of high-temperature superconductors, is given. The different hyperfine interaction parameters involved, as well as the static and dynamic susceptibility z(q,o)) will be discussed. I will point at those highlights as antiferromagnetic correlations, spin gap and vortex lattice dynamics which have emerged from the analysis of the NMR data.

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Section: Knight Shift and The Static Susceptibilitymentioning

confidence: 99%

What does NMR tell us about the electronic state of high-T c superconductors?

Mehring

1992

Appl. Magn. Reson.

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“…Comparison of the T1-NMR data of the three compounds with n--1,2 and 3 facilitates a lot of information about the static and dynamic electronic stmcture of these systems [1][2][3][4][5][6][7][8][10][11][12][13][14][15][24][25][26][27][28][29][30][31][32][33]. In Fig.1 which displays the spectra of 2~ at room temperature already several features can be seen.…”

Section: 2~mentioning

confidence: 99%

“…These two TI places are distinguishable in NM_R expe¡ because their resonance frequevcies ate different as well as their relaxation times. Intensive TI-NMR was done mainly on T12Ba2CuO6+~ [11][12][13][14][15], where T c can be varied by introducing oxygen into the sample, but the disadvantage of this compound is, that there is no Ca-layer and therefore the Tl(2) position is missing. It was observed that the temperature dependence of the line shifts and the relaxation rates of TI(l) and Tl(2) is rather different.…”

Section: Introductionmentioning

confidence: 99%

205Tl NMR in the Cuprate Superconductor Tl2Ba2CaCu2O8−δ: Evidence for a pseudo spin gap

Winzek

Mehring

1992

Appl. Magn. Reson.

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2~ in Tl2Ba2Can_lCunOs_ 6 for different n and 6 is reviewed. For n = 2,3 the 2~ spectra consist of two lines. The main line arises from TI(l) in the TlO-layer whereas the defect line belongs to Tl(2) in the Ca-layers between the CuO2-1ayers. The temperature dependent Knight shift of the TI(2) (defect) line is caused by the hyperfine interaction with the CuOz-layer and is strongly related to the oxygen content of the sample. We find quasiparticle behavior for the TI(2) line similar to the 89y Knight shift in the YBa2Cu306+ £ system. In contrast the TI(l) line shows strong antiferromagnetic correlations with indication of pseudo spin gap opening above the superconducting transition temperature T c.

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“…The 63 Cu NQR data for the (2201) [9], (2212) [10] and (2223) [11] ceramic samples are represented together with our 67 Cu 67 Zn EMS data in the C(Cu)±C(Zn) diagram (Fig. 5a, open squares).…”

mentioning

confidence: 99%

Atomic Charge States in Tl2Ba2Can?1CunO2n+4 as Determined by the61Cu(61Ni),67Cu(67Zn) and133Ba(133Cs) Emission M�ssbauer Spectroscopy

Masterov

Насрединов

Seregin

et al. 1998

phys. stat. sol. (b)

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Parameters of the electric field gradient tensors have been found for the Cu and Ba sites of the Tl 2 Ba 2 Ca nÀ1 Cu n O 2n4 lattices by the 61 Cu 61 Ni, 67 Cu 67 Zn and 133 Ba 133 Cs emission Mo È ssbauer spectroscopy. The same parameters have been calculated using the point charge approximation. An analysis of the obtained quantities has been carried out taking into consideration literature data on the 63 Cu nuclear quadrupole resonance. Agreement of the measured and calculated parameters could be reached assuming the holes resulting from lowering the valence of part of the Tl atoms to be placed mainly at oxygen sites of the Cu±O planes (especially, at oxygen sites of the Cu(2)±O planes for the Tl 2 Ba 2 Ca 2 Cu 3 O 10 compound).wetodom Cmissionnoj messuzrovskoj spektroskopii n izotoph 61 Cu 61 NiD 67 Cu 67 Zn i 133 Ba 133 Cs opredeleny prmetry tenzor grdient Clektriqeskogo pol¾ v uzlh medi i ri¾ rexetok Tl 2 Ba 2 Ca nÀ1 Cu n O 2n4 D tkwe proveden rsqet ukznnyh prmeE trov v priliwenii toqeqnyh zr¾dovF roveden nliz poluqennyh veliqin s privleE qeniem literturnyh dnnyh po ¾dernomu kvdrupol5nomu rezonnsu n izotope 63 Cu X soglsovnie Cksperimentl5nyh i rsqetnyh prmetrov dostigets¾D esli predpoloE wit5D qto dyrkiD po¾vl¾Ï §ies¾ v rezul5tte poniweni¾ vlentnosti qsti tomov tlE li¾D loklizuÏts¾ preimu §estvenno n uzlh kislorodD nhod¾ §ihs¾ v odnoj ploskosti s tommi medi @dl¾ soedineni¾ Tl 2 Ba 2 Ca 2 Cu 3 O 10 ± ± n uzlh kislorodD nhod¾ §iks¾ v odnoj ploskosti s tommi Cu2F

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Spin-lattice relaxation, NQR 63Cu and NMR 205Tl in Tl2Ba2CuO6+δ

Cited by 14 publications

References 15 publications

What does NMR tell us about the electronic state of high-T c superconductors?

What does NMR tell us about the electronic state of high-T c superconductors?

205Tl NMR in the Cuprate Superconductor Tl2Ba2CaCu2O8−δ: Evidence for a pseudo spin gap

Atomic Charge States in Tl2Ba2Can?1CunO2n+4 as Determined by the61Cu(61Ni),67Cu(67Zn) and133Ba(133Cs) Emission M�ssbauer Spectroscopy

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