X-ray-scattering study of charge- and spin-density waves in chromium

Hill, J. P.; Helgesen, Geir; Gibbs, Doon

doi:10.1103/physrevb.51.10336

Cited by 84 publications

(119 citation statements)

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“…This harmonic relationship between spin and charge is consistent with the I CDW / I 2 SDW scaling (where I is scattering intensity) that is observed as a function of T [16], but has not been tested as the ground state is tuned towards the quantum critical point.…”

supporting

confidence: 52%

“…The SDW is accompanied by a charge density wave (CDW), which is modulated by 2Q and is usually thought of as the second harmonic of the SDW [10]. This harmonic relationship between spin and charge is consistent with the I CDW / I 2 SDW scaling (where I is scattering intensity) that is observed as a function of T [16], but has not been tested as the ground state is tuned towards the quantum critical point.Early transport studies of the pressure P dependence of antiferromagnetism in Cr placed the T 0 phase transition above 8 GPa [13], necessitating the use of a diamond anvil cell. The capability of probing the spin (SDW) and charge (CDW) order parameters using x-ray diffraction has been demonstrated previously at ambient P [16,17].…”

mentioning

confidence: 66%

“…The capability of probing the spin (SDW) and charge (CDW) order parameters using x-ray diffraction has been demonstrated previously at ambient P [16,17]. Here we extend such measurements to high P at liquid helium PRL 99,…”

mentioning

confidence: 91%

“…Q may lie with equal probability along any of the three cubic axes, defining three orthogonal Q-domains. Below the Néel temperature, T N 311 K, and above the spin-flip temperature, T SF 123 K, the SDW is transverse and the spins preferentially lie along either cubic axis perpendicular to Q, defining two possible S-domains; below T SF the SDW is longitudinal [16]. The SDW is accompanied by a charge density wave (CDW), which is modulated by 2Q and is usually thought of as the second harmonic of the SDW [10].…”

mentioning

confidence: 99%

“…By measuring CDW peaks corresponding to all three Q-domain types [ Fig. 1(d) schematic] and taking into account the atomic form factor [18] and the appropriate strain wave cross section [16], we are able to calculate the Q-domain distribution, presented in Fig. 2(a).…”

mentioning

confidence: 99%

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Pressure-Tuned Spin and Charge Ordering in an Itinerant Antiferromagnet

et al. 2007

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Elemental chromium orders antiferromagnetically near room temperature, but the ordering temperature can be driven to zero by applying large pressures. We combine diamond anvil cell and synchrotron x-ray diffraction techniques to measure directly the spin and charge order in the pure metal at the approach to its quantum critical point. Both spin and charge order are suppressed exponentially with pressure, well beyond the region where disorder cuts off such a simple evolution, and they maintain a harmonic scaling relationship over decades in scattering intensity. By comparing the development of the order parameter with that of the magnetic wave vector, it is possible to ascribe the destruction of antiferromagnetism to the growth in electron kinetic energy relative to the underlying magnetic exchange interaction. DOI: 10.1103/PhysRevLett.99.137201 PACS numbers: 75.10.Lp, 75.30.Fv, 78.70.Ck, 81.30.Bx Electrons carry not only charge but also spin, and how magnetic order develops in metals where charge carriers remain itinerant continues to be a central problem in both condensed matter and device physics. As technology progresses and device dimensions shrink, quantum effects become more pronounced and a variety of potential ground states can emerge with coupled charge, spin, and orbital order [1]. These effects are most acute near quantum phase transitions, where magnetism first emerges at the absolute zero of temperature [2,3]. In particular, antiferromagnetic coupling between interacting mobile electrons is believed to underlie some of the most profound puzzles in modern metal physics, most notably exotic superconductivity, heavy fermions, and other non-Fermi-liquid phenomena [4,5].Nevertheless, definitive characterization of quantum critical behavior in itinerant magnets has proved elusive. Direct order parameter studies of stoichiometric, itinerant ferromagnets suggest that the quantum phase transition is always first order, shrouding the critical behavior [6]. Quantum critical behavior in itinerant antiferromagnets has been observed using indirect probes such as electrical transport and specific heat [5], but no direct studies of the order parameter of stoichiometric antiferromagnets exist. As a further complication, the effects of chemical doping and substitution are amplified at a quantum phase transition, where materials become ''hypersensitive'' to disorder [7].Directly observing the emergence of antiferromagnetism in a model stoichiometric system without the application of a symmetry-breaking field or dopant disorder would reveal fundamental aspects about the magnetic order itself. To this end, we present a direct x-ray diffraction study of the spin and charge order parameters in elemental chromium, the archetypical itinerant spin-density-wave (SDW) antiferromagnet, as the magnetic order is suppressed with pressure towards its quantum phase transition. Cr is attractive as a model system [8][9][10][11][12] and is particularly amenable to theoretical exposition given its simple bcc crystal lattice and well...

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supporting

confidence: 52%

mentioning

confidence: 66%

mentioning

confidence: 91%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Pressure-Tuned Spin and Charge Ordering in an Itinerant Antiferromagnet

et al. 2007

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Magnetic X‐Ray Scattering

Hill

2002

Characterization of Materials

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There are two regimes of importance in magnetic x‐ray scattering, characterized by the incident photon energy relative to the positions of the absorption edges in the system under study. These are the nonresonant and resonant limits to the cross‐section. This article provides an overall background to the theoretical and experimental principles of nonresonant and resonant magnetic x‐ray scattering. The experimental techniques are very similar to standard synchrotron x‐ray diffraction experiments; therefore discussion of the beamlines and spectrometers are limited, with only those elements particular to magnetic scattering, such as polarization analyzers, discussed in any detail. At high incident photon energy, it is possible to perform inelastic experiments utilizing the nonresonant magnetic scattering terms in the cross‐section. This allows for the measurement of magnetic Compton profiles (projections of the momentum density of the magnetic electrons, along a given direction). Magnetic Compton scattering may only be applied to ferromagnets, because of the incoherent nature of the inelastic scattering, and the technique differs in many aspects of its practical implementation from the diffraction experiments discussed here.

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Achieving Room‐Temperature Charge Density Wave in Transition Metal Dichalcogenide 1T‐VSe₂

Feng

Susilo

Lin

et al. 2020

Adv Elect Materials

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Charge density wave (CDW) systems have been widely studied and proposed to be potential candidates for next‐generation electronic devices. However, the lack of room‐temperature CDW materials has limited the development of CDW‐based electronic devices, and thus finding a way to manipulate the CDW transitions and orders toward room temperature will be of importance. Room‐temperature and above CDW transition in 1T‐VSe2 is reported. The CDW transition is found to shift to ≈114 K at 0.7 GPa, and further compression enhances the transition temperature dramatically, reaching ≈358 K at 14.6 GPa. High‐pressure Raman spectroscopy measurement confirms that room‐temperature CDW order is achieved and persists up to 15 GPa. Such significant enhancement in CDW can be attributed to the pressure enhanced out‐of‐plane Fermi surface nesting and CDW gap in 1T‐VSe2. The observation of room‐ and high‐temperature CDW transition in 1T‐VSe2 under pressure provides an engineering approach to optimizing the CDW as needed in applications, which does not only open up a new platform for searching and controlling novel states of two‐dimensional materials, but also promotes a practical development of CDW‐related technology and devices.

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X-ray-scattering study of charge- and spin-density waves in chromium

Cited by 84 publications

References 50 publications

Pressure-Tuned Spin and Charge Ordering in an Itinerant Antiferromagnet

Pressure-Tuned Spin and Charge Ordering in an Itinerant Antiferromagnet

Magnetic X‐Ray Scattering

Achieving Room‐Temperature Charge Density Wave in Transition Metal Dichalcogenide 1T‐VSe₂

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X-ray-scattering study of charge- and spin-density waves in chromium

Cited by 84 publications

References 50 publications

Pressure-Tuned Spin and Charge Ordering in an Itinerant Antiferromagnet

Pressure-Tuned Spin and Charge Ordering in an Itinerant Antiferromagnet

Magnetic X‐Ray Scattering

Achieving Room‐Temperature Charge Density Wave in Transition Metal Dichalcogenide 1T‐VSe2

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Product

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Achieving Room‐Temperature Charge Density Wave in Transition Metal Dichalcogenide 1T‐VSe₂