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Title: Unusual Magnetic Ordering Observed in Nanosized S=1/2 Quantum Spin System (CH3)(2)NH2CuCl3

Specific heat measurements were performed on nanometer-sized particles of an S = 1/2 quantum spin system, DMACuCl(3) [DMA = (CH3)(2)NH2]. A tiny peak was observed at a low temperature of approximately 1.5K at zero magnetic field, in addition to a well-defined and commonly observed peak with the bulk system at approximately 0.8 K. Under magnetic fields, it increased in intensity and coincided with the phase boundary responsible for the field-induced magnetic ordering phase above about 6 T. H-1-NMR studies confirmed that such extra peaks also indicated magnetic ordering. The resultant phase diagram is considerably different from that observed previously in the bulk system. Such a difference may be caused by the presence of extra spins found in a nanosized system by ESR measurements.
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Publication Date:
OSTI Identifier:
Report Number(s):
IS-J 8359
Journal ID: ISSN 0031-9015
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of the Physical Society of Japan; Journal Volume: 83; Journal Issue: 5
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
36 MATERIALS SCIENCE; bose-einstein condensation, chain, HELIUM, long-range order, LOW-TEMPERATURE, system