Unusual magnetic ordering observed in nanosized S = 1/2 quantum spin system (CH3)2NH2CuCl3

Yuji Inagaki; Yasutaka Sakamoto; Hiroki Morodomi; Tatsuya Kawae; Yasuo Yoshida; Takayuki Asano; Kohei Hosoi; Hirokazu Kobayashi; Hiroshi Kitagawa; Yoshitami Ajiro; Yuji Furukawa

doi:10.7566/JPSJ.83.054716

Unusual magnetic ordering observed in nanosized S = 1/2 quantum spin system (CH₃)₂NH₂CuCl₃

Yuji Inagaki, Yasutaka Sakamoto, Hiroki Morodomi, Tatsuya Kawae, Yasuo Yoshida, Takayuki Asano, Kohei Hosoi, Hirokazu Kobayashi, Hiroshi Kitagawa, Yoshitami Ajiro, Yuji Furukawa

Applied Physics

Research output: Contribution to journal › Article › peer-review

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Abstract

Specific heat measurements were performed on nanometer-sized particles of an S = 1/2 quantum spin system, DMACuCl₃ [DMA = (CH₃)₂NH₂]. A tiny peak was observed at a low temperature of approximately 1.5K at zero magnetic field, in addition to a well-defi ned 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. ¹H-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.

Original language	English
Article number	054716
Journal	journal of the physical society of japan
Volume	83
Issue number	5
DOIs	https://doi.org/10.7566/JPSJ.83.054716
Publication status	Published - May 15 2014

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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title = "Unusual magnetic ordering observed in nanosized S = 1/2 quantum spin system (CH3)2NH2CuCl3",

abstract = "Specific heat measurements were performed on nanometer-sized particles of an S = 1/2 quantum spin system, DMACuCl3 [DMA = (CH3)2NH2]. A tiny peak was observed at a low temperature of approximately 1.5K at zero magnetic field, in addition to a well-defi ned 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. 1H-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.",

author = "Yuji Inagaki and Yasutaka Sakamoto and Hiroki Morodomi and Tatsuya Kawae and Yasuo Yoshida and Takayuki Asano and Kohei Hosoi and Hirokazu Kobayashi and Hiroshi Kitagawa and Yoshitami Ajiro and Yuji Furukawa",

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doi = "10.7566/JPSJ.83.054716",

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T1 - Unusual magnetic ordering observed in nanosized S = 1/2 quantum spin system (CH3)2NH2CuCl3

AU - Inagaki, Yuji

AU - Sakamoto, Yasutaka

AU - Morodomi, Hiroki

AU - Kawae, Tatsuya

AU - Yoshida, Yasuo

AU - Asano, Takayuki

AU - Hosoi, Kohei

AU - Kobayashi, Hirokazu

AU - Kitagawa, Hiroshi

AU - Ajiro, Yoshitami

AU - Furukawa, Yuji

PY - 2014/5/15

Y1 - 2014/5/15

N2 - Specific heat measurements were performed on nanometer-sized particles of an S = 1/2 quantum spin system, DMACuCl3 [DMA = (CH3)2NH2]. A tiny peak was observed at a low temperature of approximately 1.5K at zero magnetic field, in addition to a well-defi ned 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. 1H-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.

AB - Specific heat measurements were performed on nanometer-sized particles of an S = 1/2 quantum spin system, DMACuCl3 [DMA = (CH3)2NH2]. A tiny peak was observed at a low temperature of approximately 1.5K at zero magnetic field, in addition to a well-defi ned 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. 1H-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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Unusual magnetic ordering observed in nanosized S = 1/2 quantum spin system (CH₃)₂NH₂CuCl₃

Abstract

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