Abstract
The finite-temperature properties of weakly doped antiferromagnets as modeled by the two-dimensional t-J model and relevant to underdoped cuprates are investigated by numerical studies of small model systems at low doping. Two numerical methods are used: the world line quantum Monte Carlo method with a loop cluster algorithm and the finite-temperature Lanczos method, yielding consistent results. The thermodynamic quantities - specific heat, entropy, and spin susceptibility-reveal a sizable perturbation induced by holes introduced into a magnetic insulator, as well as a pronounced temperature dependence. The diamagnetic susceptibility introduced by a coupling of the magnetic field to the orbital current reveals an anomalous temperature dependence, changing character from diamagnetic to paramagnetic at intermediate temperatures.
Originalsprache | englisch |
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Seiten (von - bis) | 6745-6753 |
Seitenumfang | 9 |
Fachzeitschrift | Physical Review B - Condensed Matter and Materials Physics |
Jahrgang | 62 |
Ausgabenummer | 10 |
DOIs | |
Publikationsstatus | Veröffentlicht - 1 Sept. 2000 |
ASJC Scopus subject areas
- Elektronische, optische und magnetische Materialien
- Physik der kondensierten Materie