Muon spin relaxation studies of the frustrated quasi-two-dimensional square-lattice spin system Cu (Cl,Br) la (Nb,Ta) 2 O7: Evolution from spin-gap to antiferromagnetic state

Y. J. Uemura; A. A. Aczel; Y. Ajiro; J. P. Carlo; T. Goko; D. A. Goldfeld; A. Kitada; G. M. Luke; G. J. MacDougall; I. G. Mihailescu; J. A. Rodriguez; P. L. Russo; Y. Tsujimoto; C. R. Wiebe; T. J. Williams; T. Yamamoto; K. Yoshimura; H. Kageyama

doi:10.1103/PhysRevB.80.174408

Muon spin relaxation studies of the frustrated quasi-two-dimensional square-lattice spin system Cu (Cl,Br) la (Nb,Ta) 2 O7: Evolution from spin-gap to antiferromagnetic state

Y. J. Uemura, A. A. Aczel, Y. Ajiro, J. P. Carlo, T. Goko, D. A. Goldfeld, A. Kitada, G. M. Luke, G. J. MacDougall, I. G. Mihailescu, J. A. Rodriguez, P. L. Russo, Y. Tsujimoto, C. R. Wiebe, T. J. Williams, T. Yamamoto, K. Yoshimura, H. Kageyama

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Abstract

We report muon spin relaxation (μSR) and magnetic-susceptibility measurements on Cu (Cl,Br) La (Nb,Ta) 2 O7, which demonstrate: (a) the absence of static magnetism in (CuCl) LaNb2 O7 down to 15 mK confirming a spin-gapped ground state; (b) phase separation between partial volumes with a spin-gap and static magnetism in (CuCl) La (Nb,Ta) 2 O7; (c) history-dependent magnetization in the (Nb,Ta) and (Cl,Br) substitution systems; (d) a uniform long-range collinear antiferromagnetic state in (CuBr) LaNb2 O7; and (e) a decrease in Néel temperature with decreasing Br concentration x in Cu (Cl1-x Brx) LaNb2 O7 with no change in the ordered Cu moment size for 0.33≤x≤1. Together with several other μSR studies of quantum phase transitions in geometrically frustrated spin systems, the present results reveal that the evolution from a spin-gap to a magnetically ordered state is often associated with phase separation and/or a first-order phase transition.

Original language	English
Article number	174408
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	80
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevB.80.174408
State	Published - Nov 13 2009
Externally published	Yes

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Uemura, Y. J., Aczel, A. A., Ajiro, Y., Carlo, J. P., Goko, T., Goldfeld, D. A., Kitada, A., Luke, G. M., MacDougall, G. J., Mihailescu, I. G., Rodriguez, J. A., Russo, P. L., Tsujimoto, Y., Wiebe, C. R., Williams, T. J., Yamamoto, T., Yoshimura, K., & Kageyama, H. (2009). Muon spin relaxation studies of the frustrated quasi-two-dimensional square-lattice spin system Cu (Cl,Br) la (Nb,Ta) 2 O7: Evolution from spin-gap to antiferromagnetic state. Physical Review B - Condensed Matter and Materials Physics, 80(17), Article 174408. https://doi.org/10.1103/PhysRevB.80.174408

@article{da4ad29afeac4b67882895db65b53ac4,

title = "Muon spin relaxation studies of the frustrated quasi-two-dimensional square-lattice spin system Cu (Cl,Br) la (Nb,Ta) 2 O7: Evolution from spin-gap to antiferromagnetic state",

abstract = "We report muon spin relaxation (μSR) and magnetic-susceptibility measurements on Cu (Cl,Br) La (Nb,Ta) 2 O7, which demonstrate: (a) the absence of static magnetism in (CuCl) LaNb2 O7 down to 15 mK confirming a spin-gapped ground state; (b) phase separation between partial volumes with a spin-gap and static magnetism in (CuCl) La (Nb,Ta) 2 O7; (c) history-dependent magnetization in the (Nb,Ta) and (Cl,Br) substitution systems; (d) a uniform long-range collinear antiferromagnetic state in (CuBr) LaNb2 O7; and (e) a decrease in N{\'e}el temperature with decreasing Br concentration x in Cu (Cl1-x Brx) LaNb2 O7 with no change in the ordered Cu moment size for 0.33≤x≤1. Together with several other μSR studies of quantum phase transitions in geometrically frustrated spin systems, the present results reveal that the evolution from a spin-gap to a magnetically ordered state is often associated with phase separation and/or a first-order phase transition.",

author = "Uemura, {Y. J.} and Aczel, {A. A.} and Y. Ajiro and Carlo, {J. P.} and T. Goko and Goldfeld, {D. A.} and A. Kitada and Luke, {G. M.} and MacDougall, {G. J.} and Mihailescu, {I. G.} and Rodriguez, {J. A.} and Russo, {P. L.} and Y. Tsujimoto and Wiebe, {C. R.} and Williams, {T. J.} and T. Yamamoto and K. Yoshimura and H. Kageyama",

year = "2009",

month = nov,

day = "13",

doi = "10.1103/PhysRevB.80.174408",

language = "English",

volume = "80",

journal = "Physical Review B - Condensed Matter and Materials Physics",

issn = "1098-0121",

publisher = "American Physical Society",

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Uemura, YJ, Aczel, AA, Ajiro, Y, Carlo, JP, Goko, T, Goldfeld, DA, Kitada, A, Luke, GM, MacDougall, GJ, Mihailescu, IG, Rodriguez, JA, Russo, PL, Tsujimoto, Y, Wiebe, CR, Williams, TJ, Yamamoto, T, Yoshimura, K & Kageyama, H 2009, 'Muon spin relaxation studies of the frustrated quasi-two-dimensional square-lattice spin system Cu (Cl,Br) la (Nb,Ta) 2 O7: Evolution from spin-gap to antiferromagnetic state', Physical Review B - Condensed Matter and Materials Physics, vol. 80, no. 17, 174408. https://doi.org/10.1103/PhysRevB.80.174408

Muon spin relaxation studies of the frustrated quasi-two-dimensional square-lattice spin system Cu (Cl,Br) la (Nb,Ta) 2 O7: Evolution from spin-gap to antiferromagnetic state. / Uemura, Y. J.; Aczel, A. A.; Ajiro, Y. et al.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 80, No. 17, 174408, 13.11.2009.

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

TY - JOUR

T1 - Muon spin relaxation studies of the frustrated quasi-two-dimensional square-lattice spin system Cu (Cl,Br) la (Nb,Ta) 2 O7

T2 - Evolution from spin-gap to antiferromagnetic state

AU - Uemura, Y. J.

AU - Aczel, A. A.

AU - Ajiro, Y.

AU - Carlo, J. P.

AU - Goko, T.

AU - Goldfeld, D. A.

AU - Kitada, A.

AU - Luke, G. M.

AU - MacDougall, G. J.

AU - Mihailescu, I. G.

AU - Rodriguez, J. A.

AU - Russo, P. L.

AU - Tsujimoto, Y.

AU - Wiebe, C. R.

AU - Williams, T. J.

AU - Yamamoto, T.

AU - Yoshimura, K.

AU - Kageyama, H.

PY - 2009/11/13

Y1 - 2009/11/13

N2 - We report muon spin relaxation (μSR) and magnetic-susceptibility measurements on Cu (Cl,Br) La (Nb,Ta) 2 O7, which demonstrate: (a) the absence of static magnetism in (CuCl) LaNb2 O7 down to 15 mK confirming a spin-gapped ground state; (b) phase separation between partial volumes with a spin-gap and static magnetism in (CuCl) La (Nb,Ta) 2 O7; (c) history-dependent magnetization in the (Nb,Ta) and (Cl,Br) substitution systems; (d) a uniform long-range collinear antiferromagnetic state in (CuBr) LaNb2 O7; and (e) a decrease in Néel temperature with decreasing Br concentration x in Cu (Cl1-x Brx) LaNb2 O7 with no change in the ordered Cu moment size for 0.33≤x≤1. Together with several other μSR studies of quantum phase transitions in geometrically frustrated spin systems, the present results reveal that the evolution from a spin-gap to a magnetically ordered state is often associated with phase separation and/or a first-order phase transition.

AB - We report muon spin relaxation (μSR) and magnetic-susceptibility measurements on Cu (Cl,Br) La (Nb,Ta) 2 O7, which demonstrate: (a) the absence of static magnetism in (CuCl) LaNb2 O7 down to 15 mK confirming a spin-gapped ground state; (b) phase separation between partial volumes with a spin-gap and static magnetism in (CuCl) La (Nb,Ta) 2 O7; (c) history-dependent magnetization in the (Nb,Ta) and (Cl,Br) substitution systems; (d) a uniform long-range collinear antiferromagnetic state in (CuBr) LaNb2 O7; and (e) a decrease in Néel temperature with decreasing Br concentration x in Cu (Cl1-x Brx) LaNb2 O7 with no change in the ordered Cu moment size for 0.33≤x≤1. Together with several other μSR studies of quantum phase transitions in geometrically frustrated spin systems, the present results reveal that the evolution from a spin-gap to a magnetically ordered state is often associated with phase separation and/or a first-order phase transition.

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DO - 10.1103/PhysRevB.80.174408

M3 - Article

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SN - 1098-0121

VL - 80

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

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M1 - 174408

ER -

Muon spin relaxation studies of the frustrated quasi-two-dimensional square-lattice spin system Cu (Cl,Br) la (Nb,Ta) 2 O7: Evolution from spin-gap to antiferromagnetic state

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