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Browsing by Author "Brinkmann D."

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Charge-excitation picture of Cu NMR Knight shift and relaxation in YBa2Cu4O8 deduced from a 3-band Hubbard model

Eremin M.; Varlamov S.; Brinkmann D.; Mali M.; Markendorf R.; Roos J. (1994)

A simplified model of copper hole excitations in the singlet band of YBa2Cu4O8 is presented. The starting point is a three-band Hubbard model comprising a Kondo-like exchange between the copper and oxygen holes which gives ...
Isotope dependence of the spin gap in YBa2Cu4O8 as determined by Cu NQR relaxation

Raffa F.; Ohno T.; Mali M.; Roos J.; Brinkmann D.; Conder K.; Eremin M. (1998)

We performed high accuracy 63Cu NQR spin-lattice relaxation and SQUID magnetization measurements on 16O and 18O exchanged YBa2Cu4O8 to determine the isotope shift of the temperature of the opening of the spin gap, T*, and ...
Low energy excitation spectrum and Cu(2) spin-lattice relaxation from the singlet correlated band in YBa2Cu4O8

Markendorf R.; Eremin M.; Varlamov S.; Brinkmann D.; Mali M.; Roos J. (1994)

We report the low energy excitation spectrum and the spin-lattice relaxation for the planar Cu of the high Tc superconductor YBa2Cu4O8. We use a three band Hubbard model. Its singlet band exhibits a well-established saddle ...
Spin susceptibility and pseudogap in YBa2Cu4O8: An approach via a charge-density-wave instability

Eremin I.; Eremin M.; Varlamov S.; Brinkmann D.; Mali M.; Roos J. (1997)

The temperature dependence of the spin susceptibility in YBa2Cu4O8 has been calculated on the assumption that a pseudogap in the normal state opens due to a charge-density-wave (CDW) instability. The agreement with experiment ...
The model of singlet-correlated bands for temperature and doping dependences of Cu(2) Knight shift in bilayered cuprates

Eremin M.; Varlamov S.; Eremin I.; Brinkmann D.; Markendorf R.; Mali M.; Roos J. (1997)

Using the model of the singlet-correlated band, the temperature and doping dependences of the planar Cu Knight shift in YBa2Cu3O7 and YBa2Cu4O8, at T > Tc, have been calculated. The spin susceptibility has been deduced by ...
Theory of nuclear spin-lattice relaxation in YBa2Cu3O7

Zavidonov A.; Brinkmann D. (2001)

Within the framework of the t-J model, we have calculated the temperature dependence of the nuclear spin-lattice relaxation rate, 1/T1, of 63Cu, 17O, and 89Y in the normal state of the superconductor YBa2Cu3O7. The main ...
Theory of the plane copper nuclear spin-lattice relaxation in La2-xSrxCuO4 and YBa2Cu3O7-y

Zavidonov A.; Larionov I.; Brinkmann D. (2000)

Within the framework of the t-J model, a microscopical theory of the copper spin-lattice relaxation in the normal state of the superconductors La2-xSrxCuO4 and YBa2Cu3O7-y compounds is presented. The main contribution to ...

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Browsing by Author "Brinkmann D."

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