TY - JOUR

T1 - Quantum frustrations in quasi-2D antiferromagnets

AU - Aristov, D. N.

AU - Maleyev, S. V.

PY - 1990/10/1

Y1 - 1990/10/1

N2 - An influence of localized holes on magnetic properties of the CuO2 planes in quasi-2D antiferromagnets (La2CuO4, YBa2Cu3Oδ+x etc.) is studied. It is demonstrated that the hole localized on the bond connecting Cu2+ ions gives birth to frustration which in a wide range of parameters behaves as the two-level system with the energy E≪J, where J is the exchange interaction of the neighbouring copper spins. As a result for T≦E the spin-wave energy may noticeably decrease even at a low concentration of the holes c if the parameter cJ|E| is not small. When this parameter is greater than unity, the reentrant transition may occur in the system. Experimental data presently available are in a qualitative agreement with the theoretical predictions.

AB - An influence of localized holes on magnetic properties of the CuO2 planes in quasi-2D antiferromagnets (La2CuO4, YBa2Cu3Oδ+x etc.) is studied. It is demonstrated that the hole localized on the bond connecting Cu2+ ions gives birth to frustration which in a wide range of parameters behaves as the two-level system with the energy E≪J, where J is the exchange interaction of the neighbouring copper spins. As a result for T≦E the spin-wave energy may noticeably decrease even at a low concentration of the holes c if the parameter cJ|E| is not small. When this parameter is greater than unity, the reentrant transition may occur in the system. Experimental data presently available are in a qualitative agreement with the theoretical predictions.

UR - http://www.scopus.com/inward/record.url?scp=0009327669&partnerID=8YFLogxK

U2 - 10.1007/BF01390825

DO - 10.1007/BF01390825

M3 - Article

AN - SCOPUS:0009327669

VL - 81

SP - 433

EP - 440

JO - Zeitschrift fur Physik B-Condensed Matter

JF - Zeitschrift fur Physik B-Condensed Matter

SN - 0722-3277

IS - 3

ER -