Magnetic behavior of a two-leg organic spin-ladder compound

Arčon, Denis; Lappas, Alexandros; Margadonna, Serena; Prassides, Kosmas; Ribera, E.; Veciana, Jaume; Rovira, Concepció; Henriques, R.T.; Almeida, Manuel

doi:10.1103/physrevb.60.4191

Cited by 45 publications

(34 citation statements)

References 21 publications

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“…Although such behaviors are not expected in the TLL spin-liquid system, they have been often seen in other spin-liquid candidates. In these systems, the increase of at low temperatures was ascribed to unpaired spins, which originate from chain breaks 18,19 . The presence of unpaired spins in K 3 Cu 3 AlO 2 (SO 4 ) 4 is evident in our previous study 8 .…”

Section: Resultsmentioning

confidence: 99%

Possible Tomonaga-Luttinger spin liquid state in the spin-1/2 inequilateral diamond-chain compound K3Cu3AlO2(SO4)4

Fujihala

Koorikawa

Mitsuda

et al. 2017

Sci Rep

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K3Cu3AlO2(SO4)4 is a highly one-dimensional spin-1/2 inequilateral diamond-chain antiferromagnet. Spinon continuum and spin-singlet dimer excitations are observed in the inelastic neutron scattering spectra, which is in excellent agreement with a theoretical prediction: a dimer-monomer composite structure, where the dimer is caused by strong antiferromagnetic (AFM) coupling and the monomer forms an almost isolated quantum AFM chain controlling low-energy excitations. Moreover, muon spin rotation/relaxation spectroscopy shows no long-range ordering down to 90 mK, which is roughly three orders of magnitude lower than the exchange interaction of the quantum AFM chain. K3Cu3AlO2(SO4)4 is, thus, regarded as a compound that exhibits a Tomonaga-Luttinger spin liquid behavior at low temperatures close to the ground state.

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Section: Resultsmentioning

confidence: 99%

Possible Tomonaga-Luttinger spin liquid state in the spin-1/2 inequilateral diamond-chain compound K3Cu3AlO2(SO4)4

Fujihala

Koorikawa

Mitsuda

et al. 2017

Sci Rep

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“…Since antiferromagnetic two-leg ladder systems with S = 1/2 have a gap in the spin excitation spectrum, they reveal an extremely rich behavior, dominated by quantum effects, in the presence of a magnetic field. These quantum phase transitions were intensively investigated both theoretically, using different analytical and numerical techniques 8,9,10,11,12,13,14,15,16 , and also experimentally 2,3,4,5,6,7 . Ladder models with ferromagnetic legs have been much less studied, although they exhibit many interesting aspects 17,18,19 .…”

Section: Introductionmentioning

confidence: 99%

Magnetic-field-induced phase transitions in spin ladders with ferromagnetic legs

2004

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We study the phase diagram of spin ladders with ferromagnetic legs under the influence of a symmetry breaking magnetic field in the weak coupling effective field theory by bosonization. For antiferromagnetic interleg coupling we identify two phase transitions introduced by the external magnetic field. In order to establish the universality of the phases we supplement the bosonization approach by results from a strong coupling (rung) expansion and from spin wave analysis.

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“…(As one will see there, we can predict that these two approximations are allowed in the any-leg weak-rung-coupling systems, at least within the qualitative level.) Under the approximations (16) and (17), the total action of ladders or tubes is described as…”

Section: A No-field Casementioning

confidence: 99%

“…Finally, we discuss the validity of our strategy in this subsection. In order to investigate the integer-spin ladders and tubes, we took approximations (16) and (17). First, we consider the validity of Eq.…”

Section: -Foldmentioning

confidence: 99%

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N-leg integer-spin ladders and tubes in commensurate external fields: Nonlinear sigma model approach

Sato

2005

Phys. Rev. B

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We investigate the low-energy properties, especially the low-energy excitation structures, of N -leg integer-spin ladders and tubes with an antiferromagnetic (AF) intrachain coupling. In the odd-leg tubes, the AF rung coupling causes the frustration. To treat all ladders and tubes systematically, we apply Sénéchal's method [Phys. Rev. B 52, 15319 (1995)], based on the nonlinear sigma model, together with a saddle-point approximation. This strategy is valid in the weak interchain (rung) coupling regime. We show that all frustrated tubes possess six-fold degenerate spin-1 magnon bands, as the lowest excitations, while other ladders and tubes have a standard triply degenerate bands. We also consider effects of four kinds of Zeeman terms: uniform, staggered only along the rung, only along the chain, or both directions. The above prediction of the no-field case implies that a sufficiently strong uniform field yields a two-component Tomonaga-Luttinger liquid (TLL) due to the condensation of doubly degenerate lowest magnons in frustrated tubes. In contrast, the field induces a standard one-component TLL in all other systems. This is supported by symmetry and bosonization arguments based on the Ginzburg-Landau theory. The bosonization also suggests that the two-component TLL vanishes and a one-component TLL appears, when the uniform field becomes larger for the second lowest magnon bands to touch the zero-energy line. This transition could be observed as a cusp singularity in the magnetization process. When the field is staggered only along the rung direction, it is implied that the lowest doubly-degenerate bands fall down with the field increasing in all systems. For final two cases where the fields are staggered along the chain, it is showed that at least in the weak rung-coupling region, the lowest-excitation gap grows with the field increasing, and no critical phenomena occurs. Furthermore, for the ladders of the final two cases, we predict that the inhomogeneous magnetization along the rung occurs, and the frustration between the field and the rung coupling can induce the magnetization pointing to the opposite direction to the field. All the analyses suggest that the emergence of the doubly degenerate transverse magnons and the single longitudinal one is universal for the one-dimensional AF spin systems with a weak staggered field.

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Magnetic behavior of a two-leg organic spin-ladder compound

Cited by 45 publications

References 21 publications

Possible Tomonaga-Luttinger spin liquid state in the spin-1/2 inequilateral diamond-chain compound K3Cu3AlO2(SO4)4

Possible Tomonaga-Luttinger spin liquid state in the spin-1/2 inequilateral diamond-chain compound K3Cu3AlO2(SO4)4

Magnetic-field-induced phase transitions in spin ladders with ferromagnetic legs

N-leg integer-spin ladders and tubes in commensurate external fields: Nonlinear sigma model approach

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