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Titolo:
S=1/2 antiferromagnetic chains and dimers on hole-doped edge-sharin CuO2 chains
Autore:
Hiroi, Z; Okumura, M; Yamada, T; Takano, M;
Indirizzi:
Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan Univ Tokyo Kashiwa Chiba Japan 2778581 hys, Kashiwa, Chiba 2778581, Japan Kyoto Univ, Chem Res Inst, Uji, Kyoto 6110011, Japan Kyoto Univ Uji KyotoJapan 6110011 em Res Inst, Uji, Kyoto 6110011, Japan
Titolo Testata:
JOURNAL OF ALLOYS AND COMPOUNDS
, volume: 317, anno: 2001,
pagine: 164 - 170
SICI:
0925-8388(20010412)317:<164:SACADO>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
ONE-DIMENSIONAL CA0.83CUO2; MAGNETIC-PROPERTIES; CA0.85CUO2; TRANSITION; SR0.73CUO2; DIMERIZATION; CA1-XCUO2; ORIGIN; ORDER;
Keywords:
quantum spin system; CuO2; chain; hole-doping;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Hiroi, Z Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan Univ Tokyo Kashiwa Chiba Japan 2778581 iwa, Chiba 2778581, Japan
Citazione:
Z. Hiroi et al., "S=1/2 antiferromagnetic chains and dimers on hole-doped edge-sharin CuO2 chains", J ALLOY COM, 317, 2001, pp. 164-170

Abstract

Holes doped on edge-sharing CuO2 chains are almost localized because of nearly orthogonal Cu-O-Cu bonds. Consequently? only spin degrees of freedom survive at low temperatures, which sometimes presents unusual quantum magnetism. Quasi-one-dimensional cupric oxides Ca1-x CuO2-delta and Sr14Cu24O41, both containing 25-50% hole-doped edge-sharing CuO2 chains, are studied by uniform magnetic susceptibility and specific heat measurements on a series of polycrystalline samples with controlled metal and oxygen contents. Most spins are always dimerized in Sr14Cr24O41, while, in contrast, antiferromagnetic chains made of nearly 50% spins exist with the remainder forming dimers of variable density in Ca1-xCuO2-delta. A two-sublattice model is proposed by considering that the nearest-neighbor couplings are negligibly small,due to both geometrical frustration and the special Cu-O-Cu bond angle of similar to 95 degrees. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/09/20 alle ore 02:28:03