From spin liquid to magnetic ordering in the anisotropic kagome Y-kapellasite <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Y</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>Cu</mml:mi><mml:mn>9</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi>OH</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mn>19</mml:mn></mml:msub><mml:msub><mml:mi>Cl</mml:mi><mml:mn>8</mml:mn></mml:msub></mml:mrow></mml:math>: A single-crystal study
Dipranjan Chatterjee, Pascal Puphal, Quentin Barthélemy, Jannis Willwater, S. Süllow, C. Baines, S. Petit, E. Ressouche, Jacques Ollivier, Katharina M. Zoch, C. Krellner, Michael Parzer, Alexander Riss, Fabian Garmroudi, Andrej Pustogow, P. Mendels, E. Kermarrec, F. Bert
Abstract
Y${}_{3}$Cu${}_{9}$(OH)${}_{19}$Cl${}_{8}$, also known as Y-kapellasite, realizes an original anisotropic frustrated kagome model. Here, the authors study large phase-pure single crystals, obtained via an external gradient method, by susceptibility, specific heat, thermal expansion, neutron scattering, and local $\ensuremath{\mu}$SR and NMR techniques. These find subtle structural changes along with long-range magnetic ordering (1/3,1/3). Large quantum fluctuations reduce the Cu${}^{2+}$ moments, likely as a result of the proximity to a phase boundary in the rich magnetic phase diagram of the model.