Disordered States in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>IPA</mml:mi><mml:mtext mathvariant="normal">−</mml:mtext><mml:mi>Cu</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:msub><mml:mi>Cl</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>Br</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mo stretchy="false">)</mml:mo><mml:mn>3</mml:mn></mml:msub></mml:math>Induced by Bond Randomness

Manaka, Hirotaka; Kolomiets, A.; Goto, T.

doi:10.1103/physrevlett.101.077204

Cited by 29 publications

(43 citation statements)

References 41 publications

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“…They all agree very well with experimental data [9,23,[31][32][33] which supports the advocated model. Since the characterization of IPA-CuCl 3 by Roberts et al [25] various spin models were discussed.…”

Section: P-1supporting

confidence: 79%

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Microscopic model for Bose-Einstein condensation and quasiparticle decay

Fischer¹,

Duffe²,

Uhrig³

2011

EPL

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Abstract. -Sufficiently dimerized quantum antiferromagnets display elementary S = 1 excitations, triplon quasiparticles, protected by a gap at low energies. At higher energies, the triplons may decay into two or more triplons. A strong enough magnetic field induces Bose-Einstein condensation of triplons. For both phenomena the compound IPA-CuCl3 is an excellent model system. Nevertheless no quantitative model was determined so far despite numerous studies. Recent theoretical progress allows us to analyse data of inelastic neutron scattering (INS) and of magnetic susceptibility to determine the four magnetic couplings J1 ≈ −2.3 meV, J2 ≈ 1.2 meV, J3 ≈ 2.9 meV and J4 ≈ −0.3 meV. These couplings determine IPA-CuCl3 as system of coupled asymmetric S = 1/2 Heisenberg ladders quantitatively. The magnetic field dependence of the lowest modes in the condensed phase as well as the temperature dependence of the gap without magnetic field corroborate this microscopic model.Low-dimensional antiferromagnetic quantum spin systems display various fascinating properties, e.g., spinPeierls transition [1, 2], appearance of a Haldane gap for integer spins [3,4], high-temperature superconductivity upon doping [5], and the Bose-Einstein condensation (BEC) in spin-dimer systems [6][7][8][9], where the latter one is characterized by a phase transition from a non-magnetic phase to a long-range antiferromagnetically ordered gapless phase at a critical magnetic field H c1 .Another fascinating phenomenon recently observed in low-dimensional antiferromagnets is the decay of their elementary S = 1 excitations, triplons [10], at higher energies so that the triplons exist only in a restricted part of the Brillouin zone [11,12]. Theoretically as well, there is rising interest in the understanding and quantitative description of this phenomenon for gapped triplons [13][14][15][16] as well as for gapless magnons [17][18][19].The description of quasiparticle decay faces an intrinsic difficulty. The merging of the long-lived, infinitely sharp elementary triplon with a multitriplon continuum requires to describe the resulting resonance and its edges precisely. This is still a challenge for numerical approaches such as exact diagonalization or dynamic density-matrix (a) fischer@fkt.physik.tu-dortmund.de (b) goetz.uhrig@tu-dortmund.de renormalization [20]. Diagrammatic approaches are able to capture the qualitative features but may encounter difficulties in the quantitative description in the regime of strong merging where the sharp mode dissolves completely in the continuum because this is a strong coupling phenomenon [13,14]. Unitary transformations also face difficulties when modes of finite life-time occur [16].A crucial step in the understanding of both phenomena is to identify a suitable experimental system. The best studied candidate for the BEC in coupled spin-dimer systems is TlCuCl 3 . Unfortunately, recent research suggests that the high field spectrum remains gapped [21,22] in contrast to what is expected from a phase where a continuous s...

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Section: P-1supporting

confidence: 79%

“…Additionally, the theoretical values also match the experimental result [31] H c2 = (43.9 ± 0.1) T(2/g) within 4%. In view of the neglect of anisotropies and magnetoelastic effects, cf.…”

Section: P-1supporting

confidence: 75%

Microscopic model for Bose-Einstein condensation and quasiparticle decay

Fischer¹,

Duffe²,

Uhrig³

2011

EPL

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“…In spingap systems, apart from the superfluid and Mott insulating states, a Bose-glass state was also predicted [7]. Since this observation in TlCuCl 3 , a search for the BEC transitions and a Bose-glass (BG) phase in magnetic materials has hastened [8,9], including also the spin-gap S=1 Haldane chains [10][11][12] or quasi-one-dimensional systems consisting of weakly interacting chains or two-leg ladders [13,14].…”

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confidence: 99%

“…For the integer spin S = 1 Ni 2+ -based compound [9], the strong easy plane anisotropy (D/J ≫ 1) is needed, whereas for the halfinteger-spin compound with two-leg ladder structures embedded, strong rung-oriented and weak leg-oriented interactions are prerequisite [13,14] to get a pseudo S = 1 Haldane chain representation. The role of the applied magnetic field is to close the spin gap and to create a finite density of bosons forming a magnetic BEC both in the pure and the doped compound [9].…”

mentioning

confidence: 99%

Bose glass behavior in(Yb1−xLux)4As3representing randomly diluted quantum spin-
Kamieniarz
¹
,
Matysiak
²
,
Gegenwart
³

et al. 2016
Phys. Rev. B

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Bose glass behavior in (Yb 1−x Lu x ) 4 As 3 representing the randomly diluted quantum spin-1/2 chains The site-diluted compound (Yb1−xLux)4As3 is a scarce realization of the linear Heisenberg antiferromagnet partitioned into finite-size segments and is an ideal model compound for studying field-dependent effects of quenched disorder in the one-dimensional antiferromagnets. It differentiates from the systems studied so far in two aspects -the type of randomness and the nature of the energy gap in the pure sample. We have measured the specific heat of single-crystal (Yb1−xLux)4As3 in magnetic fields up to 19.5 T. The contribution C ⊥ arising from the magnetic subsystem in an applied magnetic field perpendicular to the chains is determined. Compared to pure Yb4As3, for which C ⊥ indicates a gap opening, for diluted systems a non-exponential decay is found at low temperatures which is consistent with the thermodynamic scaling of the specific heat established for a Bose-glass phase.

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“…In addition to temperature-and field-dependent studies of quantum magnets, there is a growing interest in the effects of disorder. For these applications too, transition metal organic complexes are excellent models: chemical disorder is easy to introduce on either the magnetic [28][29][30] or non-magnetic [31][32][33][34] sites.…”

Section: Challenges In Quantum Magnetismmentioning

confidence: 99%

Crystals for neutron scattering studies of quantum magnetism

Yankova

Hüvonen

Mühlbauer

et al. 2012

Philosophical Magazine

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We review a strategy for targeted synthesis of large single crystal samples of prototype quantum magnets for inelastic neutron scattering experiments. Four case studies of organic copper halogenide S = 1/2 systems are presented. They are meant to illustrate that exciting experimental results pertaining to forefront many-body quantum physics can be obtained on samples grown using very simple techniques, standard laboratory equipment, and almost no experience in in advanced crystal growth techniques.

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Disordered States inIPA−Cu(ClxBr1−x)3Induced by Bond Randomness

Cited by 29 publications

References 41 publications

Microscopic model for Bose-Einstein condensation and quasiparticle decay

Microscopic model for Bose-Einstein condensation and quasiparticle decay

Bose glass behavior in(Yb1−xLux)4As3representing randomly diluted quantum spin-
Kamieniarz
¹
,
Matysiak
²
,
Gegenwart
³

et al. 2016
Phys. Rev. B

Crystals for neutron scattering studies of quantum magnetism

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Disordered States inIPA−Cu(ClxBr1−x)3Induced by Bond Randomness

Cited by 29 publications

References 41 publications

Microscopic model for Bose-Einstein condensation and quasiparticle decay

Microscopic model for Bose-Einstein condensation and quasiparticle decay

Bose glass behavior in(Yb1−xLux)4As3representing randomly diluted quantum spin-Kamieniarz1, Matysiak2, Gegenwart3 et al. 2016Phys. Rev. B

Crystals for neutron scattering studies of quantum magnetism

Contact Info

Product

Resources

About

Bose glass behavior in(Yb1−xLux)4As3representing randomly diluted quantum spin-
Kamieniarz
¹
,
Matysiak
²
,
Gegenwart
³

et al. 2016
Phys. Rev. B