Nearly critical ground state of LaCuO{sub 2.5}
- Institute for Solid State Physics, University of Tokyo, Roppongi 7-22-1, Tokyo 106 (Japan)
Using a combination of analytical techniques and quantum Monte Carlo simulations we investigate the coupled spin-ladder system LaCuO{sub 2.5}. At a critical ratio of the interladder to intraladder coupling (J{sup {prime}}/J){sub c}{approx}0.11 we find a quantum phase transition between a Neel ordered and a disordered state. At criticality the uniform susceptibility behaves as {chi}(T)=aT{sup 2} with a universal prefactor. At intermediate temperatures the system crosses over to a {open_quotes}decoupled ladders regime{close_quotes} with pseudogap-type behavior, similar to uncoupled ladders. This can explain the gaplike experimental data for the magnetic susceptibility of LaCuO{sub 2.5} despite the presence of long-range Neel order. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 510612
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 55, Issue 10; Other Information: PBD: Mar 1997
- Country of Publication:
- United States
- Language:
- English
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