High Pressure Synthesis and Spin Gap of Quasi One Dimensional System Srn-1Cun+1O2n(n=3, 5)

Autor:	Mikio Takano, Masaki Azuma, Zenji Hiroi, Kenji Ishida, Toshio Kitaoka
Rok vydání:	1994
Předmět:	Materials science Condensed matter physics Spin polarization Mechanical Engineering Metals and Alloys Industrial and Manufacturing Engineering Gapless playback High pressure Thermal Materials Chemistry Antiferromagnetism Ground state Excitation Spin-½
Zdroj:	Journal of the Japan Society of Powder and Powder Metallurgy. 41:1464-1468
ISSN:	1880-9014 0532-8799
DOI:	10.2497/jjspm.41.1464
Popis:	SrCu2O3 and Sr2Cu3O5 containing two-leg and three-leg S=1/2 ladders made of antiferromagnetic Cu-O-Cu linear bonds, respectively, were synthesized at high pressure, and their crystallographic and magnetic properties were investigated. Susceptibility of the 2-leg ladder system, SrCu2O3, showed a thermal excitation from the nonmagnetic ground state with a large spin gap of 420 K, while Sr2Cu3O5 containing 3-leg ladders had a finite susceptibility at the lowest temperature reflecting its gapless nature in the spin excitation spectrum. SrCu2O3 has thus been found to be the first 2-leg ladder compound having a well-defined spin gap.
Databáze:	OpenAIRE
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