Singlet-ground-state paramagnetic centers in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">CuO</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math> layers as seen from <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Tm</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>169</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math> NMR in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">TmBa</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">Cu</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">O</mi></mrow><mrow><mn>6</mn><mo>+</mo><mi mathvariant="italic">x</mi></mrow></msub></mrow></math> superconductors

O. N. Bakharev; J. Witteveen; H. B. Brom; E. V. Krjukov; O. B. Marvin; M. A. Teplov

doi:10.1103/PhysRevB.51.693

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Singlet-ground-state paramagnetic centers in ${CuO}_{2}$ layers as seen from ${}^{169}{Tm}$ NMR in ${TmBa}_{2}$ ${Cu}_{3}$ $O_{6 + x}$ superconductors

O. N. Bakharev, J. Witteveen, H. B. Brom, E. V. Krjukov, O. B. Marvin, and M. A. Teplov

Phys. Rev. B 51, 693(R) – Published 1 January 1995

Abstract

The ${}^{169}{Tm}$ nuclear spin-lattice relaxation in oxygen-deficient ${TmBa}_{2}$ ${Cu}_{3}$ $O_{6 + x}$ compounds, as quenched and room-temperature annealed, has been measured at low temperatures. The results are consistent with the existence of paramagnetic centers in the ${CuO}_{2}$ double layer, which have a nonmagnetic (singlet) ground state separated from an excited magnetic state by an energy gap of the order of 1 K.

Received 7 October 1994

DOI:https://doi.org/10.1103/PhysRevB.51.693

Authors & Affiliations

O. N. Bakharev, J. Witteveen, and H. B. Brom

Leiden University, P.O. Box 9506, RA 2300 Leiden, The Netherlands

E. V. Krjukov, O. B. Marvin, and M. A. Teplov

Kazan State University, 420008 Kazan, Russia

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Vol. 51, Iss. 1 — 1 January 1995

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