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Guruciaga PC, Pili L, Boyeras S, Slobinsky D, Grigera SA, Borzi RA. Anomalous out-of-equilibrium dynamics in the spin-ice material Dy 2Ti 2O 7 under moderate magnetic fields. J Phys Condens Matter 2020; 32:425804. [PMID: 32604086 DOI: 10.1088/1361-648x/aba153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We study experimentally and numerically the dynamics of the spin ice material Dy2Ti2O7 in the low temperature (T) and moderate magnetic field ( B ) regime (T ∈ [0.1, 1.7] K, B ∈ [0, 0.3] T). Our objective is to understand the main physics shaping the out-of-equilibrium magnetisation vs temperature curves in two different regimes. Very far from equilibrium, turning on the magnetic field after having cooled the system in zero field (ZFC) can increase the concentration of magnetic monopoles (localised thermal excitations present in these systems); this accelerates the dynamics. Similarly to electrolytes, this occurs through dissociation of bound monopole pairs. However, for spin ices the polarisation of the vacuum out of which the monopole pairs are created is a key factor shaping the magnetisation curves, with no analog. We observe a threshold field near 0.2 T for this fast dynamics to take place, linked to the maximum magnetic force between the attracting pairs. Surprisingly, within a regime of low temperatures and moderate fields, an extended Ohm's law can be used to describe the ZFC magnetisation curve obtained with the dipolar spin-ice model. However, in real samples the acceleration of the dynamics appears even sharper than in simulations, possibly due to the presence of avalanches. On the other hand, the effect of the field nearer equilibrium can be just the opposite to that at very low temperatures. Single crystals, as noted before for powders, abandon equilibrium at a blocking temperature T B which increases with field. Curiously, this behaviour is present in numerical simulations even within the nearest-neighbours interactions model. Simulations and experiments show that the increasing trend in T B is stronger for B ‖[100]. This suggests that the field plays a part in the dynamical arrest through monopole suppression, which is quite manifest for this field orientation.
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Affiliation(s)
- P C Guruciaga
- Centro Atómico Bariloche, Comisión Nacional de Energía Atómica (CNEA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. E. Bustillo 9500, R8402AGP San Carlos de Bariloche, Río Negro, Argentina
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2
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Kim HH, Souliou SM, Barber ME, Lefrançois E, Minola M, Tortora M, Heid R, Nandi N, Borzi RA, Garbarino G, Bosak A, Porras J, Loew T, König M, Moll PJW, Mackenzie AP, Keimer B, Hicks CW, Le Tacon M. Uniaxial pressure control of competing orders in a high-temperature superconductor. Science 2019; 362:1040-1044. [PMID: 30498124 DOI: 10.1126/science.aat4708] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Accepted: 10/25/2018] [Indexed: 11/02/2022]
Abstract
Cuprates exhibit antiferromagnetic, charge density wave (CDW), and high-temperature superconducting ground states that can be tuned by means of doping and external magnetic fields. However, disorder generated by these tuning methods complicates the interpretation of such experiments. Here, we report a high-resolution inelastic x-ray scattering study of the high-temperature superconductor YBa2Cu3O6.67 under uniaxial stress, and we show that a three-dimensional long-range-ordered CDW state can be induced through pressure along the a axis, in the absence of magnetic fields. A pronounced softening of an optical phonon mode is associated with the CDW transition. The amplitude of the CDW is suppressed below the superconducting transition temperature, indicating competition with superconductivity. The results provide insights into the normal-state properties of cuprates and illustrate the potential of uniaxial-pressure control of competing orders in quantum materials.
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Affiliation(s)
- H-H Kim
- Max Planck Institute for Solid State Research, Heisenbergstraße 1, D-70569 Stuttgart, Germany
| | - S M Souliou
- European Synchrotron Radiation Facility (ESRF), BP 220, F-38043 Grenoble Cedex, France
| | - M E Barber
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - E Lefrançois
- Max Planck Institute for Solid State Research, Heisenbergstraße 1, D-70569 Stuttgart, Germany.,European Synchrotron Radiation Facility (ESRF), BP 220, F-38043 Grenoble Cedex, France
| | - M Minola
- Max Planck Institute for Solid State Research, Heisenbergstraße 1, D-70569 Stuttgart, Germany
| | - M Tortora
- Max Planck Institute for Solid State Research, Heisenbergstraße 1, D-70569 Stuttgart, Germany
| | - R Heid
- Institute for Solid State Physics, Karlsruhe Institute of Technology, Hermann-v.-Helmholtz-Platz 176344 Karlsruhe, Germany
| | - N Nandi
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - R A Borzi
- Instituto de Física de Líquidos y Sistemas Biológicos (IFLYSIB), UNLP-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), La Plata, Argentina and Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP), c.c. 16, suc. 4, 1900 La Plata, Argentina
| | - G Garbarino
- European Synchrotron Radiation Facility (ESRF), BP 220, F-38043 Grenoble Cedex, France
| | - A Bosak
- European Synchrotron Radiation Facility (ESRF), BP 220, F-38043 Grenoble Cedex, France
| | - J Porras
- Max Planck Institute for Solid State Research, Heisenbergstraße 1, D-70569 Stuttgart, Germany
| | - T Loew
- Max Planck Institute for Solid State Research, Heisenbergstraße 1, D-70569 Stuttgart, Germany
| | - M König
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - P J W Moll
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - A P Mackenzie
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany.,Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, UK
| | - B Keimer
- Max Planck Institute for Solid State Research, Heisenbergstraße 1, D-70569 Stuttgart, Germany
| | - C W Hicks
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - M Le Tacon
- Institute for Solid State Physics, Karlsruhe Institute of Technology, Hermann-v.-Helmholtz-Platz 176344 Karlsruhe, Germany.
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3
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Baez ML, Borzi RA. The 3D Kasteleyn transition in dipolar spin ice: a numerical study with the conserved monopoles algorithm. J Phys Condens Matter 2017; 29:055806. [PMID: 27941225 DOI: 10.1088/1361-648x/aa4e6a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We study the three-dimensional Kasteleyn transition in both nearest neighbours and dipolar spin ice models using an algorithm that conserves the number of excitations. We first limit the interactions range to nearest neighbours to test the method in the presence of a field applied along [Formula: see text], and then focus on the dipolar spin ice model. The effect of dipolar interactions, which is known to be greatly self screened at zero field, is particularly strong near full polarization. It shifts the Kasteleyn transition to lower temperatures, which decreases ≈0.4 K for the parameters corresponding to the best known spin ice materials, [Formula: see text] and [Formula: see text]. This shift implies effective dipolar fields as big as 0.05 T opposing the applied field, and thus favouring the creation of 'strings' of reversed spins. We compare the reduction in the transition temperature with results in previous experiments, and study the phenomenon quantitatively using a simple molecular field approach. Finally, we relate the presence of the effective residual field to the appearance of string-ordered phases at low fields and temperatures, and we check numerically that for fields applied along [Formula: see text] there are only three different stable phases at zero temperature.
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Affiliation(s)
- M L Baez
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), UNLP-CONICET, La Plata, Argentina
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Guruciaga PC, Tarzia M, Ferreyra MV, Cugliandolo LF, Grigera SA, Borzi RA. Field-Tuned Order by Disorder in Frustrated Ising Magnets with Antiferromagnetic Interactions. Phys Rev Lett 2016; 117:167203. [PMID: 27792395 DOI: 10.1103/physrevlett.117.167203] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Indexed: 06/06/2023]
Abstract
We demonstrate the appearance of thermal order by disorder in Ising pyrochlores with staggered antiferromagnetic order frustrated by an applied magnetic field. We use a mean-field cluster variational method, a low-temperature expansion, and Monte Carlo simulations to characterize the order-by-disorder transition. By direct evaluation of the density of states, we quantitatively show how a symmetry-broken state is selected by thermal excitations. We discuss the relevance of our results to experiments in 2D and 3D samples and evaluate how anomalous finite-size effects could be exploited to detect this phenomenon experimentally in two-dimensional artificial systems, or in antiferromagnetic all-in-all-out pyrochlores like Nd_{2}Hf_{2}O_{7} or Nd_{2}Zr_{2}O_{7}, for the first time.
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Affiliation(s)
- P C Guruciaga
- Instituto de Investigaciones Físicas de Mar del Plata (IFIMAR), UNMdP-CONICET, 7600 Mar del Plata, Argentina
| | - M Tarzia
- Université Pierre et Marie Curie-Paris 6, Laboratoire de Physique Théorique de la Matière Condensée, 4, Place Jussieu, Tour 13, 5ème étage, 75252 Paris Cedex 05, France
| | - M V Ferreyra
- Instituto de Física de Líquidos y Sistemas Biológicos (IFLYSIB), UNLP-CONICET, 1900 La Plata, Argentina
| | - L F Cugliandolo
- Université Pierre et Marie Curie-Paris 6, Laboratoire de Physique Théorique et Hautes Energies, 4, Place Jussieu, Tour 13, 5ème étage, 75252 Paris Cedex 05, France
| | - S A Grigera
- Instituto de Física de Líquidos y Sistemas Biológicos (IFLYSIB), UNLP-CONICET, 1900 La Plata, Argentina
- School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, United Kingdom
| | - R A Borzi
- Instituto de Física de Líquidos y Sistemas Biológicos (IFLYSIB), UNLP-CONICET, 1900 La Plata, Argentina
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5
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Borzi RA, Gómez Albarracín FA, Rosales HD, Rossini GL, Steppke A, Prabhakaran D, Mackenzie AP, Cabra DC, Grigera SA. Intermediate magnetization state and competing orders in Dy2Ti2O7 and Ho2Ti2O7. Nat Commun 2016; 7:12592. [PMID: 27558021 PMCID: PMC5007346 DOI: 10.1038/ncomms12592] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Accepted: 07/15/2016] [Indexed: 12/03/2022] Open
Abstract
Among the frustrated magnetic materials, spin-ice stands out as a particularly interesting system. Residual entropy, freezing and glassiness, Kasteleyn transitions and fractionalization of excitations in three dimensions all stem from a simple classical Hamiltonian. But is the usual spin-ice Hamiltonian a correct description of the experimental systems? Here we address this issue by measuring magnetic susceptibility in the two most studied spin-ice compounds, Dy2Ti2O7 and Ho2Ti2O7, using a vector magnet. Using these results, and guided by a theoretical analysis of possible distortions to the pyrochlore lattice, we construct an effective Hamiltonian and explore it using Monte Carlo simulations. We show how this Hamiltonian reproduces the experimental results, including the formation of a phase of intermediate polarization, and gives important information about the possible ground state of real spin-ice systems. Our work suggests an unusual situation in which distortions might contribute to the preservation rather than relief of the effects of frustration. A classical Hamiltonian captures key properties of spin ice materials such as residual entropy and fractionalized excitations. Here, the authors present experimental results of the polarization transition that motivate a Hamiltonian with lattice distortions, which predicts an intermediate magnetization state and competing ground state orders.
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Affiliation(s)
- R A Borzi
- Instituto de Física de Líquidos y Sistemas Biológicos (IFLYSIB), UNLP-CONICET, La Plata 1900, Argentina.,Departamento de Física, Facultad de Ciencias Exactas,Universidad Nacional de La Plata, 1900 La Plata, Argentina
| | - F A Gómez Albarracín
- Departamento de Física, Facultad de Ciencias Exactas,Universidad Nacional de La Plata, 1900 La Plata, Argentina.,Instituto de Física de La Plata, UNLP-CONICET, 1900 La Plata, Argentina
| | - H D Rosales
- Departamento de Física, Facultad de Ciencias Exactas,Universidad Nacional de La Plata, 1900 La Plata, Argentina.,Instituto de Física de La Plata, UNLP-CONICET, 1900 La Plata, Argentina
| | - G L Rossini
- Departamento de Física, Facultad de Ciencias Exactas,Universidad Nacional de La Plata, 1900 La Plata, Argentina.,Instituto de Física de La Plata, UNLP-CONICET, 1900 La Plata, Argentina
| | - A Steppke
- School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, UK.,Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, Dresden, Germany
| | - D Prabhakaran
- Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK
| | - A P Mackenzie
- School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, UK.,Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, Dresden, Germany
| | - D C Cabra
- Departamento de Física, Facultad de Ciencias Exactas,Universidad Nacional de La Plata, 1900 La Plata, Argentina.,Instituto de Física de La Plata, UNLP-CONICET, 1900 La Plata, Argentina
| | - S A Grigera
- Instituto de Física de Líquidos y Sistemas Biológicos (IFLYSIB), UNLP-CONICET, La Plata 1900, Argentina.,Departamento de Física, Facultad de Ciencias Exactas,Universidad Nacional de La Plata, 1900 La Plata, Argentina.,School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, UK
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6
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Abstract
We study the dipolar spin-ice model at fixed density of single excitations, ρ, using a Monte Carlo algorithm where processes of creation and annihilation of such excitations are banned. In the limit of ρ going to zero, this model coincides with the usual dipolar spin-ice model at low temperatures, with the additional advantage that a negligible number of monopoles allows for equilibration even at the lowest temperatures. Thus, the transition to the ordered fundamental state found by Melko, den Hertog, and Gingras in 2001 is reached using simple local spin flip dynamics. As the density is increased, the monopolar nature of the excitations becomes apparent: the system shows a rich ρ vs T phase diagram with "charge" ordering transitions analogous to that observed for Coulomb charges in lattices. A further layer of complexity is revealed by the existence of order both within the charges and their associated vacuum, which can only be described in terms of spins--the true microscopic degrees of freedom of the system.
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Affiliation(s)
- R A Borzi
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas UNLP-CONICET and Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, 1900 La Plata, Argentina
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7
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Slobinsky D, Borzi RA, Mackenzie AP, Grigera SA. Fast sweep-rate plastic Faraday force magnetometer with simultaneous sample temperature measurement. Rev Sci Instrum 2012; 83:125104. [PMID: 23278023 DOI: 10.1063/1.4769049] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We present a design for a magnetometer capable of operating at temperatures down to 50 mK and magnetic fields up to 15 T with integrated sample temperature measurement. Our design is based on the concept of a Faraday force magnetometer with a load-sensing variable capacitor. A plastic body allows for fast sweep rates and sample temperature measurement, and the possibility of regulating the initial capacitance simplifies the initial bridge balancing. Under moderate gradient fields of ~1 T/m our prototype performed with a resolution better than 1 × 10(-5) emu. The magnetometer can be operated either in a dc mode, or in an oscillatory mode which allows the determination of the magnetic susceptibility. We present measurements on Dy(2)Ti(2)O(7) and Sr(3)Ru(2)O(7) as an example of its performance.
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Affiliation(s)
- D Slobinsky
- SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, United Kingdom
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8
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Slobinsky D, Castelnovo C, Borzi RA, Gibbs AS, Mackenzie AP, Moessner R, Grigera SA. Unconventional magnetization processes and thermal runaway in spin-ice Dy2Ti2O7. Phys Rev Lett 2010; 105:267205. [PMID: 21231712 DOI: 10.1103/physrevlett.105.267205] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2010] [Revised: 12/09/2010] [Indexed: 05/30/2023]
Abstract
We investigate the nonequilibrium behavior of the spin-ice Dy2Ti2O7 by studying its magnetization as a function of the field sweep rate. Below the enigmatic ''freezing'' temperature T(equil)≈600 mK, we find that even the slowest sweeps fail to yield the equilibrium magnetization curve and instead give an initially much flatter curve. For higher sweep rates, the magnetization develops sharp steps accompanied by similarly sharp peaks in the temperature of the sample. We ascribe the former behavior to the energy barriers encountered in the magnetization process, which proceeds via flipping of spins on filaments traced out by the field-driven motion of the gapped, long-range interacting magnetic monopole excitations. The peaks in temperature result from the released Zeeman energy not being carried away efficiently; the resulting heating triggers a chain reaction.
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Affiliation(s)
- D Slobinsky
- SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, United Kingdom
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9
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Mercure JF, Goh SK, O'Farrell ECT, Perry RS, Sutherland ML, Rost AW, Grigera SA, Borzi RA, Gegenwart P, Mackenzie AP. Quantum oscillations in the anomalous phase in Sr3Ru2O7. Phys Rev Lett 2009; 103:176401. [PMID: 19905773 DOI: 10.1103/physrevlett.103.176401] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2009] [Indexed: 05/28/2023]
Abstract
We report measurements of quantum oscillations detected in the putative nematic phase of Sr3Ru2O7. Improvements in sample purity enabled the resolution of small amplitude de Haas-van Alphen (dHvA) oscillations between two first order metamagnetic transitions delimiting the phase. Two distinct frequencies were observed, whose amplitudes follow the normal Lifshitz-Kosevich profile. Variations of the dHvA frequencies are explained in terms of a chemical potential shift produced by reaching a peak in the density of states, and an anomalous field dependence of the oscillatory amplitude provides information on domains.
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Affiliation(s)
- J-F Mercure
- Scottish Universities Physics Alliance (SUPA), School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, United Kingdom
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10
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Borzi RA, Grigera SA, Farrell J, Perry RS, Lister SJS, Lee SL, Tennant DA, Maeno Y, Mackenzie AP. Formation of a Nematic Fluid at High Fields in Sr3Ru2O7. Science 2006; 315:214-7. [PMID: 17124288 DOI: 10.1126/science.1134796] [Citation(s) in RCA: 376] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
In principle, a complex assembly of strongly interacting electrons can self-organize into a wide variety of collective states, but relatively few such states have been identified in practice. We report that, in the close vicinity of a metamagnetic quantum critical point, high-purity strontium ruthenate Sr3Ru2O7 possesses a large magnetoresistive anisotropy, consistent with the existence of an electronic nematic fluid. We discuss a striking phenomenological similarity between our observations and those made in high-purity two-dimensional electron fluids in gallium arsenide devices.
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Affiliation(s)
- R A Borzi
- Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9SS, UK.
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11
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Loscar ES, Borzi RA, Albano EV. Interplay between thermal percolation and jamming upon dimer adsorption on binary alloys. Phys Rev E Stat Nonlin Soft Matter Phys 2006; 74:051601. [PMID: 17279918 DOI: 10.1103/physreve.74.051601] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2006] [Indexed: 05/13/2023]
Abstract
By means of Monte Carlo simulations we study jamming and percolation processes upon the random sequential adsorption of dimers on binary alloys with different degrees of structural order. The substrates are equimolar mixtures that we simulate using an Ising model with conserved order parameter. After an annealing at temperature T we quench the alloys to freeze the state of order of the surface at this temperature. The deposition is then performed neglecting thermal effects like surface desorption or diffusion. In this way, the annealing temperature is a continuous parameter that characterizes the adsorbing surfaces, shaping the deposition process. As the alloys undergo an order-disorder phase transition at the Onsager critical temperature (Tc), the jamming and percolating properties of the set of deposited dimers are subjected to nontrivial changes, which we summarize in a density-temperature phase diagram. We find that for T<T*=1.22Tc the occurrence of jamming prevents the onset of percolating clusters, while percolation is possible for T>T*. Particular attention is focused close to T*, where the interplay between jamming and percolation restricts fluctuations, forcing exponents seemingly different from the standard percolation universality class. By analogy with a thermal transition, we study the onset of percolation using the temperature T as a control parameter. We propose thermal scaling Ansätze to analyze the behavior of the percolation threshold and its thermally induced fluctuations. Also, the fractal dimension of the percolating cluster is determined. Based on these measurements and the excellent data collapse, we conclude that the universality class of standard percolation is preserved for all temperatures.
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Affiliation(s)
- Ernesto S Loscar
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, (INIFTA), CONICET, UNLP, Sucursal 4, Casilla de Correo 16, (1900) La Plata, Argentina
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12
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Green AG, Grigera SA, Borzi RA, Mackenzie AP, Perry RS, Simons BD. Phase bifurcation and quantum fluctuations in Sr3Ru2O7. Phys Rev Lett 2005; 95:086402. [PMID: 16196876 DOI: 10.1103/physrevlett.95.086402] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2004] [Indexed: 05/04/2023]
Abstract
The bilayer ruthenate Sr3Ru2O7 has been cited as a textbook example of itinerant metamagnetic quantum criticality. However, recent studies of the ultrapure system have revealed striking anomalies in magnetism and transport in the vicinity of the quantum critical point. Drawing on fresh experimental data, we show that the complex phase behavior reported here can be fully accommodated within the framework of a simple Landau theory. We discuss the potential physical mechanisms that underpin the phenomenology, and assess the capacity of the ruthenate system to realize quantum tricritial behavior.
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Affiliation(s)
- A G Green
- School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, United Kingdom
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13
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Grigera SA, Gegenwart P, Borzi RA, Weickert F, Schofield AJ, Perry RS, Tayama T, Sakakibara T, Maeno Y, Green AG, Mackenzie AP. Disorder-Sensitive Phase Formation Linked to Metamagnetic Quantum Criticality. Science 2004; 306:1154-7. [PMID: 15539596 DOI: 10.1126/science.1104306] [Citation(s) in RCA: 216] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Condensed systems of strongly interacting electrons are ideal for the study of quantum complexity. It has become possible to promote the formation of new quantum phases by explicitly tuning systems toward special low-temperature quantum critical points. So far, the clearest examples have been appearances of superconductivity near pressure-tuned antiferromagnetic quantum critical points. We present experimental evidence for the formation of a nonsuperconducting phase in the vicinity of a magnetic field-tuned quantum critical point in ultrapure crystals of the ruthenate metal Sr3Ru2O7, and we discuss the possibility that the observed phase is due to a spin-dependent symmetry-breaking Fermi surface distortion.
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Affiliation(s)
- S A Grigera
- School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9SS, Scotland.
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14
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Borzi RA, Grigera SA, Perry RS, Kikugawa N, Kitagawa K, Maeno Y, Mackenzie AP. de Haas-van Alphen effect across the metamagnetic transition in Sr3Ru2O7. Phys Rev Lett 2004; 92:216403. [PMID: 15245301 DOI: 10.1103/physrevlett.92.216403] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2004] [Indexed: 05/24/2023]
Abstract
We report a study of the de Haas-van Alphen (dHvA) effect on the itinerant metamagnet Sr3Ru2O7. Extremely high sample purity allows the observation of dHvA oscillations both above and below the metamagnetic transition field of 7.9 T. The quasiparticle masses are fairly large away from the transition, and are enhanced by up to an extra factor of 3 as the transition is approached, but the Fermi surface topography change is quite small. The results are qualitatively consistent with a field-induced Stoner transition in which the mass enhancement is the result of critical fluctuations.
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Affiliation(s)
- R A Borzi
- School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, United Kingdom
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15
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Perry RS, Kitagawa K, Grigera SA, Borzi RA, Mackenzie AP, Ishida K, Maeno Y. Multiple first-order metamagnetic transitions and quantum oscillations in ultrapure Sr3Ru2O7. Phys Rev Lett 2004; 92:166602. [PMID: 15169251 DOI: 10.1103/physrevlett.92.166602] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2003] [Indexed: 05/24/2023]
Abstract
We present measurements on ultraclean single crystals of the bilayered ruthenate metal Sr3Ru2O7, which has a magnetic-field-tuned quantum critical point. Quantum oscillations of differing frequencies can be seen in the resistivity both below and above its metamagnetic transition. This frequency shift corresponds to a small change in the Fermi surface volume that is qualitatively consistent with the small moment change in the magnetization across the metamagnetic transition. Very near the metamagnetic field, unusual behavior is seen. There is a strong enhancement of the resistivity in a narrow field window, with a minimum in the resistivity as a function of temperature below 1 K that becomes more pronounced as the disorder level decreases. The region of anomalous behavior is bounded at low temperatures by two first-order phase transitions. The implications of the results are discussed.
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Affiliation(s)
- R S Perry
- Kyoto University International Innovation Center, Kyoto 606-8501, Japan
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Tueros MJ, Baum LA, Borzi RA, Stewart SJ, Mercader RC, Marchetti SG, Bengoa JF, Mogni LV. Characterization of Nanosized Maghemite Particles Prepared by Microemulsion Using an Ionic Surfactant. ACTA ACUST UNITED AC 2003. [DOI: 10.1023/b:hype.0000003770.22742.e7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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