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

Akira Oosawa; Takao Suzuki; Keishi Kanada; Satoshi Kojima; Takayuki Goto; Hirotaka Manaka

doi:10.1143/JPSJ.78.053702

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

Akira Oosawa, Takao Suzuki, Keishi Kanada, Satoshi Kojima, Takayuki Goto, Hirotaka Manaka

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

5 Citations (Scopus)

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.

Original language	English
Article number	053702
Journal	journal of the physical society of japan
Volume	78
Issue number	5
DOIs	https://doi.org/10.1143/JPSJ.78.053702
Publication status	Published - 2009 May
Externally published	Yes

Keywords

(CH ) CHNH Cu(Cl Br, )
Bond randomness
H-NMR
Quantum spin system
Spin gap
Spin-lattice relaxation rate T

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "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",

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.",

keywords = "(CH ) CHNH Cu(Cl Br, ), Bond randomness, H-NMR, Quantum spin system, Spin gap, Spin-lattice relaxation rate T",

author = "Akira Oosawa and Takao Suzuki and Keishi Kanada and Satoshi Kojima and Takayuki Goto and Hirotaka Manaka",

year = "2009",

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doi = "10.1143/JPSJ.78.053702",

language = "English",

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journal = "Journal of the Physical Society of Japan",

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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 - Bond randomness

KW - H-NMR

KW - Quantum spin system

KW - Spin gap

KW - Spin-lattice relaxation rate T

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