Magnetic properties of URu{sub 2}Si{sub 2} under uniaxial stress by neutron scattering

Bourdarot, Frederic; Martin, Nicolas; Raymond, Stephane; Regnault, Louis-Pierre; Aoki, Dai; Taufour, Valentin; Flouquet, Jacques

doi:10.1103/PHYSREVB.84.184430

Title: Magnetic properties of URu{sub 2}Si{sub 2} under uniaxial stress by neutron scattering

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Abstract

The aim of this study is to compare the magnetic behavior of URu{sub 2}Si{sub 2} under uniaxial stress along the a axis with the behavior under hydrostatic pressure. Both are very similar, but uniaxial stress presents a critical stress {sigma}{sub x}{sup a}[0.33(5) GPa] that is smaller than the hydrostatic critical pressure p{sub x} (0.5 GPa) where the ground state switches from a HO (hidden-order) to AF (antiferromagnetic) ground state. From these critical values and Larmor neutron diffraction, we conclude that the magnetic properties are governed by the shortest U-U distance in the plane (a lattice parameter). Under stress, the orthorhombic unit cell stays centered. A key point shown by this study is the presence of a threshold for the uniaxial stress along the a axis before the appearance of the large AF moment, which indicates no mixture of the order parameter between the HO ground state and the AF one as under hydrostatic pressure. The two most intense longitudinal magnetic excitations at Q{sub 0} =(1,0,0) and Q{sub 1} =(0.6,0,0) were measured in the HO state: the excitation at Q{sub 0} decreases in energy while the excitation at Q{sub 1} increases in energy with the uniaxial stress along the a axis.more »« less

Authors:

Bourdarot, Frederic; Martin, Nicolas; Raymond, Stephane; Regnault, Louis-Pierre ^[1]; Aoki, Dai; Taufour, Valentin; Flouquet, Jacques ^[2]

SPSMS, UMR-E 9001, CEA-INAC/ UJF-Grenoble 1, MDN, 17 rue des Martyrs, F-38054 Grenoble (France)
SPSMS, UMR-E 9001, CEA-INAC/ UJF-Grenoble 1, IMAPEC, 17 rue des Martyrs, F-38054 Grenoble (France)

Publication Date:: Tue Nov 01 00:00:00 EDT 2011

OSTI Identifier:: 21596918

Resource Type:: Journal Article

Journal Name:: Physical Review. B, Condensed Matter and Materials Physics

Additional Journal Information:: Journal Volume: 84; Journal Issue: 18; Other Information: DOI: 10.1103/PhysRevB.84.184430; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1098-0121

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; ANTIFERROMAGNETISM; COMPARATIVE EVALUATIONS; CRITICAL PRESSURE; ENERGY GAP; EXCITATION; GROUND STATES; LATTICE PARAMETERS; MAGNETIC PROPERTIES; NEUTRON DIFFRACTION; ORDER PARAMETERS; ORTHORHOMBIC LATTICES; PRESSURE RANGE GIGA PA; RUTHENIUM COMPOUNDS; SILICON COMPOUNDS; STRESSES; URANIUM COMPOUNDS; ACTINIDE COMPOUNDS; COHERENT SCATTERING; CRYSTAL LATTICES; CRYSTAL STRUCTURE; DIFFRACTION; DIMENSIONLESS NUMBERS; ENERGY LEVELS; ENERGY-LEVEL TRANSITIONS; EVALUATION; MAGNETISM; PHYSICAL PROPERTIES; PRESSURE RANGE; REFRACTORY METAL COMPOUNDS; SCATTERING; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS

Citation Formats


                    Bourdarot, Frederic, Martin, Nicolas, Raymond, Stephane, Regnault, Louis-Pierre, Aoki, Dai, Taufour, Valentin, and Flouquet, Jacques. Magnetic properties of URu{sub 2}Si{sub 2} under uniaxial stress by neutron scattering.  United States: N. p., 2011. 
        Web.  doi:10.1103/PHYSREVB.84.184430.

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                    Bourdarot, Frederic, Martin, Nicolas, Raymond, Stephane, Regnault, Louis-Pierre, Aoki, Dai, Taufour, Valentin, & Flouquet, Jacques. Magnetic properties of URu{sub 2}Si{sub 2} under uniaxial stress by neutron scattering.  United States.  https://doi.org/10.1103/PHYSREVB.84.184430

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                    Bourdarot, Frederic, Martin, Nicolas, Raymond, Stephane, Regnault, Louis-Pierre, Aoki, Dai, Taufour, Valentin, and Flouquet, Jacques. 2011.  
        "Magnetic properties of URu{sub 2}Si{sub 2} under uniaxial stress by neutron scattering".  United States.  https://doi.org/10.1103/PHYSREVB.84.184430.

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@article{osti_21596918,

  title        = {Magnetic properties of URu{sub 2}Si{sub 2} under uniaxial stress by neutron scattering},

  author       = {Bourdarot, Frederic and Martin, Nicolas and Raymond, Stephane and Regnault, Louis-Pierre and Aoki, Dai and Taufour, Valentin and Flouquet, Jacques},

  abstractNote = {The aim of this study is to compare the magnetic behavior of URu{sub 2}Si{sub 2} under uniaxial stress along the a axis with the behavior under hydrostatic pressure. Both are very similar, but uniaxial stress presents a critical stress {sigma}{sub x}{sup a}[0.33(5) GPa] that is smaller than the hydrostatic critical pressure p{sub x} (0.5 GPa) where the ground state switches from a HO (hidden-order) to AF (antiferromagnetic) ground state. From these critical values and Larmor neutron diffraction, we conclude that the magnetic properties are governed by the shortest U-U distance in the plane (a lattice parameter). Under stress, the orthorhombic unit cell stays centered. A key point shown by this study is the presence of a threshold for the uniaxial stress along the a axis before the appearance of the large AF moment, which indicates no mixture of the order parameter between the HO ground state and the AF one as under hydrostatic pressure. The two most intense longitudinal magnetic excitations at Q{sub 0} =(1,0,0) and Q{sub 1} =(0.6,0,0) were measured in the HO state: the excitation at Q{sub 0} decreases in energy while the excitation at Q{sub 1} increases in energy with the uniaxial stress along the a axis. The decrease of the energy of the excitation at Q{sub 0} seems to indicate a critical energy-gap value of 1.2(1) meV at {sigma}{sub x}{sup a}. A similar value was derived from studies under hydrostatic pressure at p{sub x}.},

  doi          = {10.1103/PHYSREVB.84.184430},

  url          = {https://www.osti.gov/biblio/21596918},
  journal      = {Physical Review. B, Condensed Matter and Materials Physics},

  issn         = {1098-0121},

  number       = 18,

  volume       = 84,

  place        = {United States},

  year         = {Tue Nov 01 00:00:00 EDT 2011},

  month        = {Tue Nov 01 00:00:00 EDT 2011}

}

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