Possible quantum nematic phase in a colossal magnetoresistance material

Beaudin, Gabrielle; Fournier, Lucie Maude; Bianchi, A.; Kenzelmann, M.; Laver, Mark; Witczak-Krempa, William

doi:10.1103/physrevb.105.035104

Cited by 6 publications

(4 citation statements)

References 69 publications

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“…Here a 2 is the two-fold component of the AMRO signal. This region matches with the anomaly in magnetostriction (yellow circles) [18], and the position of T M as identified by χ" measurements (red squares) [27]. The phase line T C separating the ferromagnetic region was determined from Cp and is shown as grey diamonds.…”

supporting

confidence: 76%

“…Their position agrees well with the region delineated by the pink squares from the Hall effect[36], as well as the position of the peak in weak non-linear resistance measurements (violet triangles)[17]. The region of the H −T -diagram where symmetry breaking observed in AMRO is shown as a color plot[27]. Here a 2 is the two-fold component of the AMRO signal.…”

supporting

confidence: 76%

“…Electronic inhomogeneity in EuB 6 was also observed in an angle-resolved magnetoresistance experiment [27]. This concurrence of magnetic polarons and electronic inhomogeneity, as seen here in EuB 6 also manifests itself in the high-T c s. Here, a quantum nematic was first theoretically predicted for the doped two-dimensional Mott insulator [3], and was later observed [28][29][30][31][32].…”

supporting

confidence: 68%

“…To complete the phase diagram, we also show our previous angular magnetoresistance oscillations (AMRO) measurements, which show a symmetry breaking a 2 due to a possible quantum nematic in EuB 6 [27]. The full AMRO response is described by…”

mentioning

confidence: 96%

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First direct observation of magnetic polarons by small-angle neutron scattering

Beaudin,

Désilets-Benoit,

Arnold

et al. 2024

Preprint

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High temperature superconductors start out as two-dimensional antiferromagnetic Mott insulators. These are then lightly doped, where the motion of these free charges distorts the surrounding Néel order and forms a string of distorted spins in the form of a magnetic polaron. Thus, magnetic polarons are thought to be central to the high-$T_c$ problem. The shape and size of such dynamic magnetic domains can be determined from small angle neutron scattering (SANS). In order to show that magnetic polarons can be detected by SANS we studied the three-dimensional ferromagnetic model system \eu, where the results of other measurements suggest the presence of magnetic polarons. In \eu, just above $T_{\mathrm{C}}$, our experiments show magnetic scattering intensity, which has a Lorentzian dependence on the wave vector, characteristic for the presence of magnetic polarons. Below $T_{\mathrm{C}}$ the polarons merge and most of the observed intensity is due to scattering from domain walls. We were able to extract a correlation length $\xi$ which ranges from 100 to 300~\AA\ for the size of the magnetic polarons. This size is much larger than one would expect for magnetic fluctuations of a 3D Heisenberg ferromagnet, demonstrating the usefulness of SANS for detecting magnetic polarons.

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supporting

confidence: 76%

supporting

confidence: 76%