Abstract
The spin-lattice relaxation rate T 1 -1 of 1H-NMR has been measured in (CH 3 ) 2CHNH 3Cu(Cl xBr l-x) 3 with x - 0 and 0.35, in order to investigate their microscopic magnetism. Previous macroscopic magnetization and specific heat measurements suggested that these two exist in a singlet-dimer phase. The temperature dependence of T 1 -1 in an x - 0 system decreased exponentially toward zero, providing microscopic evidence of a gapped singlet ground state, which is consistent with results of macroscopic experiments. At the same time, in the x = 0.35 system, T 1 -1 showed a sharp peak structure at approximately 7.5 K but no splitting of 1H-NMR spectra, indicative of magnetic ordering. We discuss the observed sharp peak structure in the x - 0.35 system with the soft mode toward the exotic magnetic ground state suggested by recent μSR experiments.
| Language | English |
|---|---|
| Article number | 053702 |
| Journal | Journal of the Physical Society of Japan |
| Volume | 78 |
| Issue number | 5 |
| DOIs | |
| State | Published - 2009 May |
| Externally published | Yes |
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Keywords
- (CH ) CHNH Cu(Cl Br, )
- H-NMR
- Bond randomness
- Quantum spin system
- Spin gap
- Spin-lattice relaxation rate T
ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
1H-NMR spin-lattice relaxation rate of the quantum spin system (CH 3) 2CHNH 3Cu(Cl xBr 1-x) 3 with x = 0 and 0.35. / Oosawa, Akira; Suzuki, Takao; Kanada, Keishi; Kojima, Satoshi; Goto, Takayuki; Manaka, Hirotaka.
In: Journal of the Physical Society of Japan, Vol. 78, No. 5, 053702, 05.2009.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - 1H-NMR spin-lattice relaxation rate of the quantum spin system (CH 3) 2CHNH 3Cu(Cl xBr 1-x) 3 with x = 0 and 0.35
AU - Oosawa,Akira
AU - Suzuki,Takao
AU - Kanada,Keishi
AU - Kojima,Satoshi
AU - Goto,Takayuki
AU - Manaka,Hirotaka
PY - 2009/5
Y1 - 2009/5
N2 - The spin-lattice relaxation rate T 1 -1 of 1H-NMR has been measured in (CH 3 ) 2CHNH 3Cu(Cl xBr l-x) 3 with x - 0 and 0.35, in order to investigate their microscopic magnetism. Previous macroscopic magnetization and specific heat measurements suggested that these two exist in a singlet-dimer phase. The temperature dependence of T 1 -1 in an x - 0 system decreased exponentially toward zero, providing microscopic evidence of a gapped singlet ground state, which is consistent with results of macroscopic experiments. At the same time, in the x = 0.35 system, T 1 -1 showed a sharp peak structure at approximately 7.5 K but no splitting of 1H-NMR spectra, indicative of magnetic ordering. We discuss the observed sharp peak structure in the x - 0.35 system with the soft mode toward the exotic magnetic ground state suggested by recent μSR experiments.
AB - The spin-lattice relaxation rate T 1 -1 of 1H-NMR has been measured in (CH 3 ) 2CHNH 3Cu(Cl xBr l-x) 3 with x - 0 and 0.35, in order to investigate their microscopic magnetism. Previous macroscopic magnetization and specific heat measurements suggested that these two exist in a singlet-dimer phase. The temperature dependence of T 1 -1 in an x - 0 system decreased exponentially toward zero, providing microscopic evidence of a gapped singlet ground state, which is consistent with results of macroscopic experiments. At the same time, in the x = 0.35 system, T 1 -1 showed a sharp peak structure at approximately 7.5 K but no splitting of 1H-NMR spectra, indicative of magnetic ordering. We discuss the observed sharp peak structure in the x - 0.35 system with the soft mode toward the exotic magnetic ground state suggested by recent μSR experiments.
KW - (CH ) CHNH Cu(Cl Br, )
KW - H-NMR
KW - Bond randomness
KW - Quantum spin system
KW - Spin gap
KW - Spin-lattice relaxation rate T
UR - http://www.scopus.com/inward/record.url?scp=67649127068&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=67649127068&partnerID=8YFLogxK
U2 - 10.1143/JPSJ.78.053702
DO - 10.1143/JPSJ.78.053702
M3 - Article
VL - 78
JO - Journal of the Physical Society of Japan
T2 - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 5
M1 - 053702
ER -