Magnetoelastic coupling in URu2Si2: Probing multipolar correlations in the hidden order state
Time-reversal symmetry and magnetoelastic correlations are probed by means of high-resolution volume dilatometry in URu 2 Si 2 at cryogenic temperatures, and magnetic fields sufficient to suppress the hidden order state at H HO ( T = 0.66 K ) ≃ 35 T. We report a significant magnetoelastic volume exp...
| Autores: | , , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2019 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/129066 |
| Acceso en línea: | http://hdl.handle.net/11336/129066 |
| Access Level: | acceso abierto |
| Palabra clave: | nuclear Magnetoelastic URu 2 Si 2 hidden order state https://purl.org/becyt/ford/2.5 https://purl.org/becyt/ford/2 |
| Sumario: | Time-reversal symmetry and magnetoelastic correlations are probed by means of high-resolution volume dilatometry in URu 2 Si 2 at cryogenic temperatures, and magnetic fields sufficient to suppress the hidden order state at H HO ( T = 0.66 K ) ≃ 35 T. We report a significant magnetoelastic volume expansion at and above H HO ( T ) , and even above T HO , possibly a consequence of field-induced f -electron localization. We investigate in detail the magnetostriction and magnetization as the temperature is reduced across two decades in temperature from 30 K where the system is paramagnetic, to 0.5 K in the realm of the hidden order state. We find a dominant quadratic-in-field dependence Δ L / L ∝ H 2 , a result consistent with a state that is symmetric under time reversal. The data shows, however, an incipient yet unmistakable asymptotic approach to linear ( Δ L / L ∝ 1 − H / H 0 ) for 15 T < H < H HO ( 0.66 K ) ∼ 40 T at the lowest temperatures. We discuss these results in the framework of a Ginzburg-Landau formalism that proposes a complex order parameter for the HO phase to model the ( H , T , p ) phase diagram. |
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