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Regensburg 2022 – scientific programme

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MA: Fachverband Magnetismus

MA 4: Disordered Magnetic Materials

MA 4.1: Talk

Monday, September 5, 2022, 09:30–09:45, H47

Destruction of long-range magnetic order in the Cu2GaBO5 ludwigite in a magnetic fieldA. Kulbakov1, R. Sarkar1, O. Janson2, S. Dengre1, E. M. Moshkina3, P. Y. Portnichenko1, H. Luetkens4, F. Yokaichiya5, A. S. Sukhanov1,6, R. M. Eremina7, A. Schneidewind8, H.-H. Klauss1, A. Korshunov9, and •D. S. Inosov11TU Dresden, Germany — 2IFW Dresden, Germany — 3Krasnoyarsk, Russia — 4PSI, Villigen, Switzerland — 5HZB, Berlin, Germany — 6MPI CPfS, Dresden, Germany — 7Kazan, Russia — 8JCNS @ MLZ, Forschungszentrum Jülich, Germany — 9ESRF, Grenoble, France

The quantum spin system Cu2GaBO5 with the ludwigite structure consists of a structurally ordered Cu2+ sublattice interpenetrated by a disordered sublattice with a random site occupation by magnetic Cu2+ and nonmagnetic Ga3+. In zero magnetic field, antiferromagnetic long-range order with the propagation vector qm = (0.45, 0, 0.7) sets in below TN = 4.1 K, corresponding to a complex noncollinear structure with a large magnetic unit cell. Gapless spin dynamics in the form of a diffuse quasielastic peak is evidenced by neutron scattering. Remarkably, a magnetic field of ∼1 T destroys the static long-range order, which is manifested in the gradual broadening of magnetic Bragg peaks. Such a crossover to a spin-glass regime may result from orphan spins on the structurally disordered magnetic sublattice, which are polarized in magnetic field and act as a tuning knob for field-controlled magnetic disorder. For details, see Phys. Rev. B 103, 024447 (2021).

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