Publications of Sara Haravifard    :chronological  combined listing:

%% Books   
@book{fds322486,
   Author = {Haravifard, S and Yamani, Z and Gaulin, BD},
   Title = {Quantum Phase Transitions},
   Volume = {48},
   Pages = {43-144},
   Booktitle = {Experimental Methods in the Physical Sciences},
   Year = {2015},
   Month = {January},
   ISBN = {9780128020494},
   url = {http://dx.doi.org/10.1016/B978-0-12-802049-4.00002-6},
   Abstract = {© 2015 Elsevier Inc. Quantum phase transition (QPT) occurs
             at zero temperature where thermal fluctuations are absent
             and instead the transition is driven by quantum fluctuations
             which are tuned by va riations in some nonthermal
             parameters, such as pressure, magnetic field, or chemical
             composition, as demanded by Heisenberg's uncertainty
             principle. Although QPT occurs at zero temperature, its
             influence expands to a broad nonzero temperature regime of
             quantum criticality, enabling us to study these phenomena
             through variety of experimental techniques. This chapter
             considers QPTs in quantum magnets, presenting a brief
             introduction to several well-studied systems and reviewing
             experimental examples for spin dimers, geometrically
             frustrated magnets, heavy fermions, itinerant magnets, and
             transverse field Ising systems, with focus on neutron
             scattering techniques utilized to deliver a more
             comprehensive picture of the fundamental physics behind the
             QPT in these systems.},
   Doi = {10.1016/B978-0-12-802049-4.00002-6},
   Key = {fds322486}
}


%% Papers Published   
@article{fds302508,
   Author = {Haravifard, S and Fritsch, K and Asano, T and Clancy, JP and Yamani, Z and Ehlers, G and Nishimura, T and Inagaki, Y and Kawae, T and Swainson, I and Gaulin, BD},
   Title = {Coexistence of singlet and ordered moments in the ground
             state of the triclinic quantum magnet CuMoO},
   Journal = {Physical Review B - Condensed Matter and Materials
             Physics},
   Volume = {84},
   Number = {9},
   Year = {2011},
   Month = {September},
   ISSN = {1098-0121},
   url = {http://dx.doi.org/10.1103/PhysRevB.84.094436},
   Doi = {10.1103/PhysRevB.84.094436},
   Key = {fds302508}
}

@article{fds302512,
   Author = {Haravifard, S and Banerjee, A and Lang, JC and Srajer, G and Silevitch,
             DM and Gaulin, BD and Dabkowska, HA and Rosenbaum,
             TF},
   Title = {Continuous and discontinuous quantum phase transitions in a
             model two-dimensional magnet.},
   Journal = {Proceedings of the National Academy of Sciences of
             USA},
   Volume = {109},
   Number = {7},
   Pages = {2286-2289},
   Year = {2012},
   Month = {February},
   ISSN = {0027-8424},
   url = {http://dx.doi.org/10.1073/pnas.1114464109},
   Abstract = {The Shasty-Sutherland model, which consists of a set of spin
             1/2 dimers on a 2D square lattice, is simple and soluble but
             captures a central theme of condensed matter physics by
             sitting precariously on the quantum edge between isolated,
             gapped excitations and collective, ordered ground states. We
             compress the model Shastry-Sutherland material,
             SrCu(2)(BO(3))(2), in a diamond anvil cell at cryogenic
             temperatures to continuously tune the coupling energies and
             induce changes in state. High-resolution X-ray measurements
             exploit what emerges as a remarkably strong spin-lattice
             coupling to both monitor the magnetic behavior and the
             absence or presence of structural discontinuities. In the
             low-pressure spin-singlet regime, the onset of magnetism
             results in an expansion of the lattice with decreasing
             temperature, which permits a determination of the
             pressure-dependent energy gap and the almost isotropic
             spin-lattice coupling energies. The singlet-triplet gap
             energy is suppressed continuously with increasing pressure,
             vanishing completely by 2 GPa. This continuous quantum phase
             transition is followed by a structural distortion at higher
             pressure.},
   Doi = {10.1073/pnas.1114464109},
   Key = {fds302512}
}

@article{fds302505,
   Author = {Dabkowska, HA and Dabkowski, AB and Luke, GM and Dunsiger, SR and Haravifard, S and Cecchinel, M and Gaulin, BD},
   Title = {Crystal growth and magnetic behaviour of pure and doped
             SrCu2(11BO3)2},
   Journal = {Journal of Crystal Growth},
   Volume = {306},
   Number = {1},
   Pages = {123-128},
   Year = {2007},
   Month = {August},
   ISSN = {0022-0248},
   url = {http://dx.doi.org/10.1016/j.jcrysgro.2007.04.040},
   Abstract = {High quality single crystals of incongruently melting SrCu 2
             (BO 3 ) 2 , both pure and doped with Mg, La and Na have been
             grown by optical floating zone (OFZ)-image furnace technique
             using self-flux. The obtained single crystals were
             characterized by X-ray powder diffraction and by neutron
             scattering using highly enriched 11 B for selected crystals.
             Magnetic susceptibility measurements from 3 to 300 K, with a
             magnetic field parallel to the ab plane were performed on
             pure and doped crystals oriented by the Laue method. The
             measurements show a relatively complex behaviour and confirm
             the formation of a spin singlet ground state at low
             temperatures. No evidence of superconductivity is observed.
             © 2007 Elsevier B.V. All rights reserved.},
   Doi = {10.1016/j.jcrysgro.2007.04.040},
   Key = {fds302505}
}

@article{fds318450,
   Author = {Haravifard, S and Graf, D and Feiguin, AE and Batista, CD and Lang, JC and Silevitch, DM and Srajer, G and Gaulin, BD and Dabkowska, HA and Rosenbaum, TF},
   Title = {Crystallization of spin superlattices with pressure and
             field in the layered magnet SrCu2(BO3)2.},
   Journal = {Nature Communications},
   Volume = {7},
   Pages = {11956},
   Year = {2016},
   Month = {January},
   url = {http://dx.doi.org/10.1038/ncomms11956},
   Abstract = {An exact mapping between quantum spins and boson gases
             provides fresh approaches to the creation of quantum
             condensates and crystals. Here we report on magnetization
             measurements on the dimerized quantum magnet SrCu2(BO3)2 at
             cryogenic temperatures and through a quantum-phase
             transition that demonstrate the emergence of fractionally
             filled bosonic crystals in mesoscopic patterns, specified by
             a sequence of magnetization plateaus. We apply tens of
             Teslas of magnetic field to tune the density of bosons and
             gigapascals of hydrostatic pressure to regulate the
             underlying interactions. Simulations help parse the balance
             between energy and geometry in the emergent spin
             superlattices. The magnetic crystallites are the end result
             of a progression from a direct product of singlet states in
             each short dimer at zero field to preferred filling
             fractions of spin-triplet bosons in each dimer at large
             magnetic field, enriching the known possibilities for
             collective states in both quantum spin and atomic
             systems.},
   Doi = {10.1038/ncomms11956},
   Key = {fds318450}
}

@article{fds302511,
   Author = {Haravifard, S and Banerjee, A and van Wezel, J and Silevitch, DM and dos
             Santos, AM and Lang, JC and Kermarrec, E and Srajer, G and Gaulin, BD and Molaison, JJ and Dabkowska, HA and Rosenbaum, TF},
   Title = {Emergence of long-range order in sheets of magnetic
             dimers.},
   Journal = {Proceedings of the National Academy of Sciences of
             USA},
   Volume = {111},
   Number = {40},
   Pages = {14372-14377},
   Year = {2014},
   Month = {October},
   ISSN = {0027-8424},
   url = {http://dx.doi.org/10.1073/pnas.1413318111},
   Abstract = {Quantum spins placed on the corners of a square lattice can
             dimerize and form singlets, which then can be transformed
             into a magnetic state as the interactions between dimers
             increase beyond threshold. This is a strictly 2D transition
             in theory, but real-world materials often need the third
             dimension to stabilize long-range order. We use high
             pressures to convert sheets of Cu(2+) spin 1/2 dimers from
             local singlets to global antiferromagnet in the model system
             SrCu2(BO3)2. Single-crystal neutron diffraction measurements
             at pressures above 5 GPa provide a direct signature of the
             antiferromagnetic ordered state, whereas high-resolution
             neutron powder and X-ray diffraction at commensurate
             pressures reveal a tilting of the Cu spins out of the plane
             with a critical exponent characteristic of 3D transitions.
             The addition of anisotropic, interplane, spin-orbit terms in
             the venerable Shastry-Sutherland Hamiltonian accounts for
             the influence of the third dimension.},
   Doi = {10.1073/pnas.1413318111},
   Key = {fds302511}
}

@article{fds302506,
   Author = {Asano, T and Nishimura, T and Ichimura, S and Inagaki, Y and Kawae, T and Fukui, T and Narumi, Y and Kindo, K and Ito, T and Haravifard, S and D.
             Gaulin, B},
   Title = {Erratum: “Magnetic Ordering and Tunable Structural Phase
             Transition in the Chromic Compound CuMoO 4
             ”},
   Journal = {Journal of the Physical Society of Japan},
   Volume = {80},
   Number = {11},
   Pages = {118001-118001},
   Year = {2011},
   Month = {November},
   ISSN = {0031-9015},
   url = {http://dx.doi.org/10.1143/JPSJ.80.118001},
   Doi = {10.1143/JPSJ.80.118001},
   Key = {fds302506}
}

@article{fds302502,
   Author = {Gaulin, BD and Lee, SH and Haravifard, S and Castellan, JP and Berlinsky, AJ and Dabkowska, HA and Qiu, Y and Copley,
             JR},
   Title = {High-resolution study of spin excitations in the singlet
             ground state of SrCu2(BO3)2.},
   Journal = {Physical Review Letters},
   Volume = {93},
   Number = {26 Pt 1},
   Pages = {267202},
   Year = {2004},
   Month = {December},
   ISSN = {0031-9007},
   url = {http://dx.doi.org/10.1103/physrevlett.93.267202},
   Abstract = {High-resolution, inelastic neutron scattering measurements
             on SrCu2(BO3)2, a realization of the Shastry-Sutherland
             model for two-dimensional Heisenberg antiferromagnets,
             reveal the dispersion of the three single triplet
             excitations continuously across the (H,0) direction within
             its tetragonal basal plane. These measurements also show
             distinct Q dependencies for the single and multiple triplet
             excitations, and that these excitations are largely
             dispersionless perpendicular to this plane. The temperature
             dependence of the intensities of these excitations is well
             described as the complement of the dc susceptibility of
             SrCu2(BO3)2.},
   Doi = {10.1103/physrevlett.93.267202},
   Key = {fds302502}
}

@article{fds302503,
   Author = {Haravifard, S and Dunsiger, SR and El Shawish and S and Gaulin, BD and Dabkowska, HA and Telling, MT and Perring, TG and Bonca,
             J},
   Title = {In-gap spin excitations and finite triplet lifetimes in the
             dilute singlet ground state system SrCu(2-x)Mgx(BO3)2.},
   Journal = {Physical Review Letters},
   Volume = {97},
   Number = {24},
   Pages = {247206},
   Year = {2006},
   Month = {December},
   ISSN = {0031-9007},
   url = {http://dx.doi.org/10.1103/physrevlett.97.247206},
   Abstract = {High resolution neutron scattering measurements on a single
             crystal of SrCu(2-x)Mgx(BO3)2 with x approximately 0.05
             reveal the presence of new spin excitations within the gap
             of this quasi-two-dimensional, singlet ground state system.
             The application of a magnetic field induces Zeeman-split
             states associated with S=1/2 unpaired spins which are
             antiferromagnetically correlated with the bulk singlet.
             Substantial broadening of both the one- and two-triplet
             excitations in the doped single crystal is observed, as
             compared with pure SrCu2(BO3)2. Theoretical calculations
             using a variational algorithm and a single quenched magnetic
             vacancy on an infinite lattice are shown to qualitatively
             account for these effects.},
   Doi = {10.1103/physrevlett.97.247206},
   Key = {fds302503}
}

@article{fds302507,
   Author = {Asano, T and Nishimura, T and Ichimura, S and Inagaki, Y and Kawae, T and Fukui, T and Narumi, Y and Kindo, K and Ito, T and Haravifard, S and D.
             Gaulin, B},
   Title = {Magnetic Ordering and Tunable Structural Phase Transition in
             the Chromic Compound CuMoO 4},
   Journal = {Journal of the Physical Society of Japan},
   Volume = {80},
   Number = {9},
   Pages = {093708-093708},
   Year = {2011},
   Month = {September},
   ISSN = {0031-9015},
   url = {http://dx.doi.org/10.1143/JPSJ.80.093708},
   Doi = {10.1143/JPSJ.80.093708},
   Key = {fds302507}
}

@article{fds302504,
   Author = {Haravifard, S and Rule, KC and Dabkowska, HA and Gaulin, BD and Yamani,
             Z and Buyers, WJL},
   Title = {Neutron and x-ray scattering studies of the lightly doped
             spin–Peierls system Cu 1− Cd GeO 3},
   Journal = {Journal of Physics: Condensed Matter},
   Volume = {19},
   Number = {43},
   Pages = {436222-436222},
   Year = {2007},
   Month = {October},
   ISSN = {0953-8984},
   url = {http://dx.doi.org/10.1088/0953-8984/19/43/436222},
   Doi = {10.1088/0953-8984/19/43/436222},
   Key = {fds302504}
}

@article{fds302510,
   Author = {Haravifard, S and Gaulin, BD and Yamani, Z and Dunsiger, SR and Dabkowska, HA},
   Title = {Neutron scattering from the static and dynamic lattice of
             SrCu (BO ) in its Shastry-Sutherland singlet ground
             state},
   Journal = {Physical Review B - Condensed Matter and Materials
             Physics},
   Volume = {85},
   Number = {13},
   Year = {2012},
   Month = {April},
   ISSN = {1098-0121},
   url = {http://dx.doi.org/10.1103/PhysRevB.85.134104},
   Doi = {10.1103/PhysRevB.85.134104},
   Key = {fds302510}
}

@article{fds302509,
   Author = {Feng, Y and Wang, J and Jaramillo, R and van Wezel, J and Haravifard, S and Srajer, G and Liu, Y and Xu, Z-A and Littlewood, PB and Rosenbaum,
             TF},
   Title = {Order parameter fluctuations at a buried quantum critical
             point.},
   Journal = {Proceedings of the National Academy of Sciences of
             USA},
   Volume = {109},
   Number = {19},
   Pages = {7224-7229},
   Year = {2012},
   Month = {May},
   ISSN = {0027-8424},
   url = {http://dx.doi.org/10.1073/pnas.1202434109},
   Abstract = {Quantum criticality is a central concept in condensed matter
             physics, but the direct observation of quantum critical
             fluctuations has remained elusive. Here we present an X-ray
             diffraction study of the charge density wave (CDW) in
             2H-NbSe(2) at high pressure and low temperature, where we
             observe a broad regime of order parameter fluctuations that
             are controlled by proximity to a quantum critical point.
             X-rays can track the CDW despite the fact that the quantum
             critical regime is shrouded inside a superconducting phase;
             and in contrast to transport probes, allow direct
             measurement of the critical fluctuations of the charge
             order. Concurrent measurements of the crystal lattice point
             to a critical transition that is continuous in nature. Our
             results confirm the long-standing expectations of enhanced
             quantum fluctuations in low-dimensional systems, and may
             help to constrain theories of the quantum critical Fermi
             surface.},
   Doi = {10.1073/pnas.1202434109},
   Key = {fds302509}
}

@article{fds302513,
   Author = {Haravifard, S and Banerjee, A and van Wezel, J and Silevitch, DM and dos
             Santos, AM and Lang, JC and Kermarrec, E and Srajer, G and Gaulin, BD and Molaison, JJ and Dabkowska, HA and Rosenbaum, TF},
   Title = {Reply to Zayed: Interplay of magnetism and structure in the
             Shastry-Sutherland model.},
   Journal = {Proceedings of the National Academy of Sciences of
             USA},
   Volume = {112},
   Number = {5},
   Pages = {E383-E384},
   Year = {2015},
   Month = {February},
   ISSN = {0027-8424},
   url = {http://dx.doi.org/10.1073/pnas.1423100112},
   Doi = {10.1073/pnas.1423100112},
   Key = {fds302513}
}