Polarized neutron on URu2Si2

F. Bourdarot; E. Ressouche; R. Ballou; S. Raymond; D. Aoki; N. Martin; L. P. Regnault; V. Simonet; M. T. Fernandez-Diaz; A. Stunault; V. Taufour; J. Flouquet

doi:10.1016/j.phpro.2013.03.168

Polarized neutron on URu₂Si₂

F. Bourdarot, E. Ressouche, R. Ballou, S. Raymond, D. Aoki, N. Martin, L. P. Regnault, V. Simonet, M. T. Fernandez-Diaz, A. Stunault, V. Taufour, J. Flouquet

IMR - Materials Processing and Characterization Division

Research output: Contribution to journal › Conference article › peer-review

2 Citations (Scopus)

Abstract

Polarized neutron scattering has shed a new light on URu₂Si ₂. This compound studied for almost thirty years presents two transitions: a superconducting state below 1.2K (T_sc) and a well-defined bulk transition at 17.8K (T₀). In spite of intensive research, no local probe has defined the order parameter associated with this transition (the famous Hidden Order (HO)). Neutron Larmor diffraction measurements combined with uniaxial stress experiments have shown that the relevant parameter that governs the magnetic properties is the a-lattice parameter. Induced magnetization distribution measured by elastic polarized neutron scattering shows a subtle change when entering the HO state that suggests a freezing of rank 5 multipoles (i.e. dotriacontapole). Polarized inelastic neutron measurements have shown the existence of two well defined excitations on the top of a broad continuum. However only the AF excitation vanishes at T₀ and as well as when URu₂Si₂ switches between HO to AF state under pressure. These excitations seem to correspond also to transitions between singlet levels.

Original language	English
Pages (from-to)	4-9
Number of pages	6
Journal	Physics Procedia
Volume	42
DOIs	https://doi.org/10.1016/j.phpro.2013.03.168
Publication status	Published - 2013
Event	9th International Workshop on Polarised Neutrons in Condensed Matter Investigations, PNCMI 2012 - Paris, France Duration: 2012 Jul 2 → 2012 Jul 5

Keywords

Elastic and inelastic neutron scattering
Heavy fermions superconductors

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10.1016/j.phpro.2013.03.168

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title = "Polarized neutron on URu2Si2",

abstract = "Polarized neutron scattering has shed a new light on URu2Si 2. This compound studied for almost thirty years presents two transitions: a superconducting state below 1.2K (Tsc) and a well-defined bulk transition at 17.8K (T0). In spite of intensive research, no local probe has defined the order parameter associated with this transition (the famous Hidden Order (HO)). Neutron Larmor diffraction measurements combined with uniaxial stress experiments have shown that the relevant parameter that governs the magnetic properties is the a-lattice parameter. Induced magnetization distribution measured by elastic polarized neutron scattering shows a subtle change when entering the HO state that suggests a freezing of rank 5 multipoles (i.e. dotriacontapole). Polarized inelastic neutron measurements have shown the existence of two well defined excitations on the top of a broad continuum. However only the AF excitation vanishes at T0 and as well as when URu2Si2 switches between HO to AF state under pressure. These excitations seem to correspond also to transitions between singlet levels.",

keywords = "Elastic and inelastic neutron scattering, Heavy fermions superconductors",

author = "F. Bourdarot and E. Ressouche and R. Ballou and S. Raymond and D. Aoki and N. Martin and Regnault, {L. P.} and V. Simonet and Fernandez-Diaz, {M. T.} and A. Stunault and V. Taufour and J. Flouquet",

year = "2013",

doi = "10.1016/j.phpro.2013.03.168",

language = "English",

volume = "42",

pages = "4--9",

journal = "Physics Procedia",

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T1 - Polarized neutron on URu2Si2

AU - Bourdarot, F.

AU - Ressouche, E.

AU - Ballou, R.

AU - Raymond, S.

AU - Aoki, D.

AU - Martin, N.

AU - Regnault, L. P.

AU - Simonet, V.

AU - Fernandez-Diaz, M. T.

AU - Stunault, A.

AU - Taufour, V.

AU - Flouquet, J.

PY - 2013

Y1 - 2013

N2 - Polarized neutron scattering has shed a new light on URu2Si 2. This compound studied for almost thirty years presents two transitions: a superconducting state below 1.2K (Tsc) and a well-defined bulk transition at 17.8K (T0). In spite of intensive research, no local probe has defined the order parameter associated with this transition (the famous Hidden Order (HO)). Neutron Larmor diffraction measurements combined with uniaxial stress experiments have shown that the relevant parameter that governs the magnetic properties is the a-lattice parameter. Induced magnetization distribution measured by elastic polarized neutron scattering shows a subtle change when entering the HO state that suggests a freezing of rank 5 multipoles (i.e. dotriacontapole). Polarized inelastic neutron measurements have shown the existence of two well defined excitations on the top of a broad continuum. However only the AF excitation vanishes at T0 and as well as when URu2Si2 switches between HO to AF state under pressure. These excitations seem to correspond also to transitions between singlet levels.

AB - Polarized neutron scattering has shed a new light on URu2Si 2. This compound studied for almost thirty years presents two transitions: a superconducting state below 1.2K (Tsc) and a well-defined bulk transition at 17.8K (T0). In spite of intensive research, no local probe has defined the order parameter associated with this transition (the famous Hidden Order (HO)). Neutron Larmor diffraction measurements combined with uniaxial stress experiments have shown that the relevant parameter that governs the magnetic properties is the a-lattice parameter. Induced magnetization distribution measured by elastic polarized neutron scattering shows a subtle change when entering the HO state that suggests a freezing of rank 5 multipoles (i.e. dotriacontapole). Polarized inelastic neutron measurements have shown the existence of two well defined excitations on the top of a broad continuum. However only the AF excitation vanishes at T0 and as well as when URu2Si2 switches between HO to AF state under pressure. These excitations seem to correspond also to transitions between singlet levels.

KW - Elastic and inelastic neutron scattering

KW - Heavy fermions superconductors

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T2 - 9th International Workshop on Polarised Neutrons in Condensed Matter Investigations, PNCMI 2012

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ER -

Polarized neutron on URu₂Si₂

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