C 63/65 u - And C 35/37 l-NMR studies of triplet localization in the quantum spin system NH4 CuCl3

H. Inoue, S. Tani, S. Hosoya, K. Inokuchi, T. Fujiwara, T. Saito, Takao Suzuki, A. Oosawa, T. Goto, M. Fujisawa, H. Tanaka, T. Sasaki, S. Awaji, K. Watanabe, N. Kobayashi

Research output: Contribution to journalArticle

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Abstract

C 63/65 u - and C 35/37 l-NMR experiments were performed to investigate triplet localization in the S=1/2 dimer compound NH4 CuCl3, which shows magnetization plateaus at one-quarter and three-quarters of the saturation magnetization. In C 63/65 u-NMR experiments, signal from only the singlet Cu site was observed, because that from the triplet Cu site was invisible due to the strong spin fluctuation of onsite 3d spins. We found that the temperature dependence of the shift of C 63/65 u-NMR spectra at the singlet Cu site deviated from that of macroscopic magnetization below T=6K. This deviation is interpreted as the triplet localization in this system. From the C 35/37 l-NMR experiments at the 1/4-plateau phase, we found the two different temperature dependences of Cl shift, namely, the temperature dependence of one deviates below T=6K from that of the macroscopic magnetization as observed in the C 63/65 u-NMR experiments, whereas the other corresponds well with that of the macroscopic magnetization in the entire experimental temperature region. We interpreted these dependences as reflecting the transferred hyperfine field at the Cl site located at a singlet site and at a triplet site, respectively. This result also indicates that the triplets are localized at low temperatures. C 63/65 u-NMR experiments performed at high magnetic fields between the one-quarter and three-quarters magnetization plateaus have revealed that the two differently oriented dimers in the unit cell are equally occupied by triplets, the fact of which limits the theoretical model on the periodic structure of the localized triplets.

Original languageEnglish
Article number174418
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number17
DOIs
Publication statusPublished - 2009 May 1
Externally publishedYes

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Nuclear magnetic resonance
Magnetization
magnetization
nuclear magnetic resonance
plateaus
Dimers
Experiments
temperature dependence
Temperature
dimers
Spin fluctuations
shift
Periodic structures
Saturation magnetization
Magnetic fields
deviation
saturation
cells
magnetic fields
temperature

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

C 63/65 u - And C 35/37 l-NMR studies of triplet localization in the quantum spin system NH4 CuCl3. / Inoue, H.; Tani, S.; Hosoya, S.; Inokuchi, K.; Fujiwara, T.; Saito, T.; Suzuki, Takao; Oosawa, A.; Goto, T.; Fujisawa, M.; Tanaka, H.; Sasaki, T.; Awaji, S.; Watanabe, K.; Kobayashi, N.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 79, No. 17, 174418, 01.05.2009.

Research output: Contribution to journalArticle

Inoue, H, Tani, S, Hosoya, S, Inokuchi, K, Fujiwara, T, Saito, T, Suzuki, T, Oosawa, A, Goto, T, Fujisawa, M, Tanaka, H, Sasaki, T, Awaji, S, Watanabe, K & Kobayashi, N 2009, 'C 63/65 u - And C 35/37 l-NMR studies of triplet localization in the quantum spin system NH4 CuCl3', Physical Review B - Condensed Matter and Materials Physics, vol. 79, no. 17, 174418. https://doi.org/10.1103/PhysRevB.79.174418
Inoue, H. ; Tani, S. ; Hosoya, S. ; Inokuchi, K. ; Fujiwara, T. ; Saito, T. ; Suzuki, Takao ; Oosawa, A. ; Goto, T. ; Fujisawa, M. ; Tanaka, H. ; Sasaki, T. ; Awaji, S. ; Watanabe, K. ; Kobayashi, N. / C 63/65 u - And C 35/37 l-NMR studies of triplet localization in the quantum spin system NH4 CuCl3. In: Physical Review B - Condensed Matter and Materials Physics. 2009 ; Vol. 79, No. 17.
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T1 - C 63/65 u - And C 35/37 l-NMR studies of triplet localization in the quantum spin system NH4 CuCl3

AU - Inoue, H.

AU - Tani, S.

AU - Hosoya, S.

AU - Inokuchi, K.

AU - Fujiwara, T.

AU - Saito, T.

AU - Suzuki, Takao

AU - Oosawa, A.

AU - Goto, T.

AU - Fujisawa, M.

AU - Tanaka, H.

AU - Sasaki, T.

AU - Awaji, S.

AU - Watanabe, K.

AU - Kobayashi, N.

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N2 - C 63/65 u - and C 35/37 l-NMR experiments were performed to investigate triplet localization in the S=1/2 dimer compound NH4 CuCl3, which shows magnetization plateaus at one-quarter and three-quarters of the saturation magnetization. In C 63/65 u-NMR experiments, signal from only the singlet Cu site was observed, because that from the triplet Cu site was invisible due to the strong spin fluctuation of onsite 3d spins. We found that the temperature dependence of the shift of C 63/65 u-NMR spectra at the singlet Cu site deviated from that of macroscopic magnetization below T=6K. This deviation is interpreted as the triplet localization in this system. From the C 35/37 l-NMR experiments at the 1/4-plateau phase, we found the two different temperature dependences of Cl shift, namely, the temperature dependence of one deviates below T=6K from that of the macroscopic magnetization as observed in the C 63/65 u-NMR experiments, whereas the other corresponds well with that of the macroscopic magnetization in the entire experimental temperature region. We interpreted these dependences as reflecting the transferred hyperfine field at the Cl site located at a singlet site and at a triplet site, respectively. This result also indicates that the triplets are localized at low temperatures. C 63/65 u-NMR experiments performed at high magnetic fields between the one-quarter and three-quarters magnetization plateaus have revealed that the two differently oriented dimers in the unit cell are equally occupied by triplets, the fact of which limits the theoretical model on the periodic structure of the localized triplets.

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