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Magnetic excitations in frustrated fcc type-III antiferromagnet MnS 2. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:125802. [PMID: 30583292 DOI: 10.1088/1361-648x/aafaeb] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Spin wave dispersion in the frustrated fcc type-III antiferromagnet MnS2 has been determined by inelastic neutron scattering using a triple-axis spectrometer. Existence of multiple spin wave branches, with significant separation between high-energy and low-energy modes highlighting the intrinsic magnetic frustration effect on the fcc lattice, is explained in terms of a spin wave analysis carried out for the antiferromagnetic Heisenberg model for this S = 5/2 system with nearest and next-nearest-neighbor exchange interactions. Comparison of the calculated dispersion with spin wave measurement also reveals small suppression of magnetic frustration resulting from reduced exchange interaction between frustrated spins, possibly arising from anisotropic deformation of the cubic structure.
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Magnetic structure of phase II in U(Ru(0.96)Rh(0.04))2Si2 determined by neutron diffraction under pulsed high magnetic fields. PHYSICAL REVIEW LETTERS 2013; 110:216406. [PMID: 23745903 DOI: 10.1103/physrevlett.110.216406] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2013] [Revised: 04/23/2013] [Indexed: 06/02/2023]
Abstract
We report neutron diffraction measurements on U(Ru(0.96)Rh(0.04))(2)Si(2) single crystal under pulsed high magnetic fields up to 30 T applied along the tetragonal c axis. The high-field experiments revealed that the field-induced phase II above 26 T corresponds to a commensurate up-up-down ferrimagnetic structure characterized by the wave vector q=(2/3,0,0) with the magnetic moments parallel to the c axis, which naturally explains the one-third magnetization plateau and the substantially changed Fermi surface in phase II. This a-axis modulated magnetic structure indicates that the phase II near the hidden order phase is closely related to the characteristic incommensurate magnetic fluctuations at Q(1)=(0.6,0,0) in the pure system URu(2)Si(2), in contrast to the pressure-induced antiferromagnetic order at Q(0)=(1,0,0).
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Macroscopic quantum coherence of the spin triplet in the spin-ladder compound Sr14Cu24O41. PHYSICAL REVIEW LETTERS 2010; 105:097202. [PMID: 20868189 DOI: 10.1103/physrevlett.105.097202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2010] [Revised: 06/24/2010] [Indexed: 05/29/2023]
Abstract
We report the direct observation by inelastic neutron scattering experiments of a spin triplet of magnetic excitations in the response associated with the ladders in the composite cuprate Sr14Cu24O41. This appears as a peak at q(Q1D)=π and energy Δ1=32.5 meV, and we conjecture that all the triplets making up this conspicuous peak have the same phase and therefore interpret it as the signature of the occurrence of quantum coherence along the ladder direction between entangled spin pairs. From the comparison with previous neutron and x-ray data, we conclude that the temperature evolution of this mode is driven by the crystallization of holes into a charge density wave in the ladder sublattice.
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Quantum dynamics and entanglement of spins on a square lattice. Proc Natl Acad Sci U S A 2007; 104:15264-9. [PMID: 17884986 PMCID: PMC2000527 DOI: 10.1073/pnas.0703293104] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2006] [Indexed: 11/18/2022] Open
Abstract
Bulk magnetism in solids is fundamentally quantum mechanical in nature. Yet in many situations, including our everyday encounters with magnetic materials, quantum effects are masked, and it often suffices to think of magnetism in terms of the interaction between classical dipole moments. Whereas this intuition generally holds for ferromagnets, even as the size of the magnetic moment is reduced to that of a single electron spin (the quantum limit), it breaks down spectacularly for antiferromagnets, particularly in low dimensions. Considerable theoretical and experimental progress has been made in understanding quantum effects in one-dimensional quantum antiferromagnets, but a complete experimental description of even simple two-dimensional antiferromagnets is lacking. Here we describe a comprehensive set of neutron scattering measurements that reveal a non-spin-wave continuum and strong quantum effects, suggesting entanglement of spins at short distances in the simplest of all two-dimensional quantum antiferromagnets, the square lattice Heisenberg system.
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Magnetic excitations in multiferroic TbMnO3: evidence for a hybridized soft mode. PHYSICAL REVIEW LETTERS 2007; 98:137206. [PMID: 17501238 DOI: 10.1103/physrevlett.98.137206] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2006] [Indexed: 05/15/2023]
Abstract
The magnetic excitations in multiferroic TbMnO3 have been studied by inelastic neutron scattering in the spiral and sinusoidally ordered phases. At the incommensurate magnetic zone center of the spiral phase, we find three low-lying magnons whose character has been fully determined using neutron-polarization analysis. The excitation at the lowest energy is the sliding mode of the spiral, and two modes at 1.1 and 2.5 meV correspond to rotations of the spiral rotation plane. These latter modes are expected to couple to the electric polarization. The 2.5 meV mode is in perfect agreement with recent infrared-spectroscopy data giving strong support to its interpretation as a hybridized phonon-magnon excitation.
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Spin excitations in an anisotropic bond-alternating quantum s = 1 chain in a magnetic field: contrast to haldane spin chains. PHYSICAL REVIEW LETTERS 2005; 94:177202. [PMID: 15904331 DOI: 10.1103/physrevlett.94.177202] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2005] [Indexed: 05/02/2023]
Abstract
Inelastic neutron scattering experiments on the S = 1 quasi-one-dimensional bond-alternating antiferromagnet Ni(C9D24N4)(NO2)ClO4 have been performed under magnetic fields below and above a critical field Hc at which the energy gap closes. Normal field dependence of Zeeman splitting of the excited triplet modes below Hc has been observed, but the highest mode is unusually small and smears out with increasing field. This can be explained by an interaction with a low-lying two magnon continuum at q(parallel) = pi that is present in dimerized chains but absent in uniform ones. Above Hc, we find only one excited mode, in stark contrast with three massive excitations previously observed in the structurally similar Haldane-gap material NDMAP [A. Zheludev, Phys. Rev. B 68, 134438 (2003)].
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Resonant magnetic excitations at high energy in superconducting YBa2Cu3O6.85. PHYSICAL REVIEW LETTERS 2004; 93:167001. [PMID: 15525020 DOI: 10.1103/physrevlett.93.167001] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2004] [Revised: 07/23/2004] [Indexed: 05/24/2023]
Abstract
A detailed inelastic neutron scattering study of the high temperature superconductor YBa2Cu3O6.85 provides evidence of new resonant magnetic features, in addition to the well-known resonant mode at 41 meV: (i) a commensurate magnetic resonance peak at 53 meV with an even symmetry under exchange of two adjacent CuO2 layers, and (ii) high-energy incommensurate resonant spin excitations whose spectral weight is around 54 meV. The locus and the spectral weight of these modes provides unrevealed insight about the momentum shape of the electron-hole spin-flip continuum of d-wave superconductors.
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Ordering and excitations in the field-induced magnetic phase of Cs3Cr2Br9. PHYSICAL REVIEW LETTERS 2004; 92:177202. [PMID: 15169187 DOI: 10.1103/physrevlett.92.177202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2003] [Indexed: 05/24/2023]
Abstract
Field-induced magnetic order has been investigated in detail in the interacting spin 3/2 dimer system Cs3Cr2Br9. Elastic and inelastic neutron scattering measurements were performed up to H=6 T, well above the critical field H(c1) approximately 1.5 T. The ordering displays incommensurabilities and a large hysteresis before a commensurate structure is reached. This structure is fully determined. Surprisingly, the lowest excitation branch never closes. Above H(c1), the gap increases slowly with the field. An analysis in terms of projected pseudospins is given.
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Two resonant magnetic modes in an overdoped high T(c) superconductor. PHYSICAL REVIEW LETTERS 2003; 91:237002. [PMID: 14683208 DOI: 10.1103/physrevlett.91.237002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2003] [Indexed: 05/24/2023]
Abstract
A detailed inelastic neutron scattering study of the overdoped high temperature copper oxide superconductor Y(0.9)Ca(0.1)Ba(2)Cu(3)O(7) reveals two-distinct magnetic resonant modes in the superconducting state. The modes differ in their symmetry with respect to exchange between adjacent copper oxide layers. Counterparts of the mode with odd symmetry, but not the one with even symmetry, had been observed before at lower doping levels. The observation of the even mode resolves a long-standing puzzle, and the spectral weight ratio of both modes yields an estimate of the onset of particle-hole spin-flip excitations.
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Magnetic resonant mode in the single-layer high-temperature superconductor Tl2Ba2CuO(6+delta). Science 2002; 295:1045-7. [PMID: 11809938 DOI: 10.1126/science.1067877] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
An unusual spin excitation mode observed by neutron scattering has inspired numerous theoretical studies of the interplay between charged quasiparticles and collective spin excitations in the copper oxide high-temperature superconductors. The mode has, thus far, only been observed in materials with crystal structures consisting of copper oxide bilayers, and it is absent in the single-layer compound La(2-x)Sr(x)CuO(4+delta). Neutron-scattering data now show that the mode is present in Tl(2)Ba(2)CuO(6+delta), a single-layer compound with a superconducting transition temperature of approximately 90 kelvin, demonstrating that it is a generic feature of the copper oxide superconductors, independent of the layer sequence. This restricts the theoretical models for the origin of the resonant mode and its role in the mechanism of high-temperature superconductivity.
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Excitations of the field-induced quantum soliton lattice in CuGeO(3). PHYSICAL REVIEW LETTERS 2001; 87:177203. [PMID: 11690306 DOI: 10.1103/physrevlett.87.177203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2000] [Indexed: 05/23/2023]
Abstract
The incommensurate magnetic soliton lattice in the high-field phase of a spin-Peierls system results from quantum fluctuations. We have used neutron scattering techniques to study CuGeO(3), allowing us to obtain the first complete characterization of the excitations of the soliton lattice. Three distinct excitation branches are observed, all of which are gapped. The two highest energy modes have minimum gaps at the commensurate wave vector and correspond to the creation or annihilation of soliton pairs. The third mode is incommensurate and is discussed in relation to theoretical predictions.
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Dzyaloshinski-Moriya interaction in the 2D spin gap system SrCu(2)(BO(3))(2). PHYSICAL REVIEW LETTERS 2001; 87:167205. [PMID: 11690240 DOI: 10.1103/physrevlett.87.167205] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2001] [Indexed: 05/23/2023]
Abstract
The Dzyaloshinski-Moriya interaction partially lifts the magnetic frustration of the spin-1/2 oxide SrCu(2)(BO(3))(2). It explains the fine structure of the excited triplet state and its unusual magnetic field dependence, as observed in previous ESR and new neutron inelastic scattering experiments. We claim that it is mainly responsible for the dispersion. We propose also a new mechanism for the observed ESR transitions forbidden by standard selection rules, which relies on an instantaneous Dzyaloshinski-Moriya interaction induced by spin-phonon couplings.
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Charge ordering and spin dynamics in NaV(2)O(5). PHYSICAL REVIEW LETTERS 2001; 86:5966-5969. [PMID: 11415405 DOI: 10.1103/physrevlett.86.5966] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2000] [Indexed: 05/23/2023]
Abstract
We report high-resolution neutron inelastic scattering experiments on the spin excitations of NaV(2)O(5). Below T(c), two branches with distinct energy gaps are identified. From the dispersion and intensity of the spin excitation modes, we deduce the precise zigzag charge distribution on the ladder rungs and the corresponding charge order: Delta(c) approximately 0.6. We argue that the spin gaps observed in the low-T phase of this compound are primarily due to the charge transfer.
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Antiferromagnetic ordering in superconducting YBa2Cu3O6.5. PHYSICAL REVIEW LETTERS 2001; 86:4100-4103. [PMID: 11328105 DOI: 10.1103/physrevlett.86.4100] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2001] [Indexed: 05/23/2023]
Abstract
Commensurate antiferromagnetic ordering has been observed in the superconducting high- Tc cuprate YBa2Cu3O6.5 ( Tc = 55 K) by polarized and unpolarized elastic neutron scattering. The magnetic peak intensity exhibits a marked enhancement at Tc. Zero-field muon-spin-resonance experiments demonstrate that the staggered magnetization is not truly static but fluctuates on a nanosecond time scale. These results point towards an unusual spin density wave state coexisting with superconductivity.
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Resonant spin excitation in an overdoped high temperature superconductor. PHYSICAL REVIEW LETTERS 2001; 86:1610-1613. [PMID: 11290205 DOI: 10.1103/physrevlett.86.1610] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2000] [Indexed: 05/23/2023]
Abstract
An inelastic neutron scattering study of overdoped Bi(2)Sr(2)CaCu(2)O(8+delta) ( T(c) = 83 K) has revealed a resonant spin excitation in the superconducting state. The mode energy is E(res) = 38.0 meV, significantly lower than in optimally doped Bi(2)Sr(2)CaCu(2)O(8+delta) ( T(c) = 91 K, E(res) = 42.4 meV). This observation, which indicates a constant ratio E(res)/k(B)T(c) approximately 5.4, helps resolve a long-standing controversy about the origin of the resonant spin excitation in high temperature superconductors.
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A neutron investigation of the soliton regime in the one-dimensional planar antiferromagnet (CD3)4NMnCl3. ACTA ACUST UNITED AC 2000. [DOI: 10.1088/0022-3719/15/6/020] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Quantum impurities and the neutron resonance peak in YBa2Cu3O7: Ni versus Zn. PHYSICAL REVIEW LETTERS 2000; 84:5900-5903. [PMID: 10991083 DOI: 10.1103/physrevlett.84.5900] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/1999] [Indexed: 05/23/2023]
Abstract
The influence of magnetic (S=1) and nonmagnetic (S=0) impurities on the spin dynamics of an optimally doped high temperature superconductor is compared in YBa2(Cu0.97Ni0.03)3O7 (Tc=80 K) and YBa2(Cu0.99Zn0.01)3O7 (Tc=78 K). In the Ni-substituted system, the magnetic resonance peak (which is observed at Er approximately 40 meV in the pure system) shifts to lower energy with a preserved Er/Tc ratio while the shift is much smaller upon Zn substitution. By contrast Zn, but not Ni, restores significant spin fluctuations around 40 meV in the normal state. These observations are discussed in the light of models proposed for the magnetic resonance peak.
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Abstract
A comprehensive inelastic neutron scattering study of magnetic excitations in the near optimally doped high-temperature superconductor YBa(2)Cu(3)O(6.85) is presented. The spin correlations in the normal state are commensurate with the crystal lattice, and the intensity is peaked around the wave vector characterizing the antiferromagnetic state of the insulating precursor, YBa(2)Cu(3)O(6). Profound modifications of the spin excitation spectrum appear abruptly below the superconducting transition temperature T(c), where a commensurate resonant mode and a set of weaker incommensurate peaks develop. The data are consistent with models that are based on an underlying two-dimensional Fermi surface, predicting a continuous, downward dispersion relation connecting the resonant mode and the incommensurate excitations. The magnetic incommensurability in the YBa(2)Cu(3)O(6+)(x) system is thus not simply related to that of another high-temperature superconductor, La(2-)(x)Sr(x)CuO(4), where incommensurate peaks persist well above T(c). The temperature-dependent incommensurability is difficult to reconcile with interpretations based on charge stripe formation in YBa(2)Cu(3)O(6+x) near optimum doping.
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Magnetic neutron-scattering investigation of the field-induced Griffiths phase in FeCl2. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:9015-9018. [PMID: 9984621 DOI: 10.1103/physrevb.54.9015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Direct observation of optical magnons in YBa2Cu3O6.2. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:R14741-R14744. [PMID: 9983344 DOI: 10.1103/physrevb.53.r14741] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Inelastic-neutron-scattering investigation of the spin-Peierls system CuGeO3. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:5579-5597. [PMID: 9984167 DOI: 10.1103/physrevb.53.5579] [Citation(s) in RCA: 80] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Zinc-induced modification of the dynamical magnetic susceptibility in the superconducting state of YBa2Cu3O6+x as revealed by inelastic neutron scattering. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:6811-6818. [PMID: 9982083 DOI: 10.1103/physrevb.53.6811] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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25
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Inelastic-neutron-scattering study of antiferromagnetic fluctuations in YBa2Cu3O6.97. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:876-885. [PMID: 9983044 DOI: 10.1103/physrevb.53.876] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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26
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Inelastic-neutron-scattering study of the spin dynamics in the Haldane-gap system Ni(C2H8N2)2NO2ClO4. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:9174-9187. [PMID: 9974963 DOI: 10.1103/physrevb.50.9174] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Structural evidence for a spin Peierls ground state in the quasi-one-dimensional compound CuGeO3. PHYSICAL REVIEW LETTERS 1994; 72:4037-4040. [PMID: 10056363 DOI: 10.1103/physrevlett.72.4037] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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28
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New nonlinear modes in planar antiferromagnets: A study of polarized-neutron, inelastic scattering of (CD3)4NMnCl3 in a transverse field. PHYSICAL REVIEW LETTERS 1990; 64:1557-1560. [PMID: 10041428 DOI: 10.1103/physrevlett.64.1557] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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29
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Phase Transitions in Quasi Two-Dimensional Planar Magnets. MAGNETIC PROPERTIES OF LAYERED TRANSITION METAL COMPOUNDS 1990. [DOI: 10.1007/978-94-009-1860-3_6] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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EXPERIMENTAL EVIDENCES FOR AN HALDANE GAP IN QUASI ONE-DIMENSIONAL ANTIFERROMAGNETS. ACTA ACUST UNITED AC 1988. [DOI: 10.1051/jphyscol:19888655] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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32
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Neutron scattering study of the heavy-fermion compound CeRu2Si2. PHYSICAL REVIEW. B, CONDENSED MATTER 1988; 38:4481-4487. [PMID: 9946834 DOI: 10.1103/physrevb.38.4481] [Citation(s) in RCA: 83] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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33
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Diffusion of solitons in the antiferromagnetic chains of (CD3)4NMnCl3: A study by neutron spin echo. PHYSICAL REVIEW LETTERS 1985; 55:1778-1781. [PMID: 10031921 DOI: 10.1103/physrevlett.55.1778] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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34
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Solitons in the paramagnetic and partially disordered phases of CsCoCl3. PHYSICAL REVIEW. B, CONDENSED MATTER 1985; 31:3015-3026. [PMID: 9936156 DOI: 10.1103/physrevb.31.3015] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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35
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