SPIN LIQUID IN AN ALMOST FERROMAGNETIC KONDO-LATTICE

A theory of stabilization of a spin liquid in a Kondo lattice at tempe ratures close to the temperature of antiferromagnetic instability has been developed. Kondo exchange scattering of conduction electrons lead s to emergence of a state of the spin liquid of the resonating valence bonds (RVB) type at T > T-K. Owing to this stabilization, low-energy processes of Kondo scattering with energies below TK are frozen so tha t the ''singlet'' state of the Kondo lattice is not realized; instead a strongly correlated spin liquid with developed antiferromagnetic flu ctuations occurs. A new version of the Feynman diagram technique has b een developed to describe interaction between spin fluctuations and re sonant valence bonds in a self-consistent manner. Emergence of a stron gly anisotropic RVB spin liquid is discussed. (C) 1997 American Instit ute of Physics.