Thermodynamic and diamagnetic properties of weakly doped antiferromagnets

Darko Veberič*, Peter Prelovšek, Hans Gerd Evertz

*Korrespondierende/r Autor/in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftArtikelBegutachtung

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.

Originalspracheenglisch
Seiten (von - bis)6745-6753
Seitenumfang9
FachzeitschriftPhysical Review B - Condensed Matter and Materials Physics
Jahrgang62
Ausgabenummer10
DOIs
PublikationsstatusVeröffentlicht - 1 Sep 2000

ASJC Scopus subject areas

  • Elektronische, optische und magnetische Materialien
  • Physik der kondensierten Materie

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