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Field-induced incommensurate phase in the strong-rung spin ladder with ferromagnetic legs

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arxiv 1406.2231 v1 pith:GUCMXIVD submitted 2014-06-09 cond-mat.str-el

Field-induced incommensurate phase in the strong-rung spin ladder with ferromagnetic legs

H. Yamaguchi , H. Miyagai , M. Yoshida , M. Takigawa , K. Iwase , T. Ono , N. Kase , K. Araki
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S. Kittaka T. Sakakibara T. Shimokawa T. Okubo K. Okunishi A. Matsuo Y. Hosokoshi
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classification cond-mat.str-el
keywords strong-rungferromagneticfield-inducedheatincommensurateladdermagneticorder
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report magnetization, specific heat, and NMR measurements of 3-Br-4-F-V [=3-(3-bromo-4-fluorophenyl)-1,5-diphenylverdazyl], a strong-rung S=1/2 Heisenberg spin ladder with ferromagnetic leg interactions. We explain the magnetic and thermodynamic properties based on the strong-rung regime. Furthermore, we find a field-induced successive phase transition in the specific heat and the nuclear spin-lattice relaxation rate 1/T1. 19F-NMR spectra for higher- and lower-temperature phases indicate partial magnetic order and incommensurate long-range order, respectively, evidencing the presence of frustration due to weak interladder couplings.

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