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SUMMARY:Investigating magnetic transitions and the quantum spin liquid sta
 te in complex oxides
DTSTART:20261103T100000Z
DTEND:20261103T110000Z
DTSTAMP:20261104T151500Z
UID:indico-event-1780@indico.ifj.edu.pl
DESCRIPTION:Speakers: Dhanpal Bairwa (Department of Physics\, Indian Insti
 tute of Science\, Bengaluru\, India)\n\nMagnetic properties emerge from th
 e interplay of spin\, crystal structures\, and external factors such as te
 mperature\, magnetic fields\, and pressure\, resulting in a diverse range 
 of magnetic phenomena with potential applications in sensors\, data storag
 e\, quantum technologies\, etc. orthoferrites (RFeO3) display magnetic pro
 perties such as spin reorientation (SRT)\, spin switching (SSW)\, ultrafas
 t switching\, magnetocaloric effect\, exchange bias and magnetic compensat
 ion. Fe spins adopt magnetic configurations such as Γ1\, Γ2\, and Γ4 in
  these compounds. SRT occurs when the magnetization axis rotates from one 
 crystallographic direction to another. ErFeO3 shows SRT between 88 and 98 
 K\, whereas SmFeO3 exhibits SRT between 450 and 480 K. Substituting Sm int
 o ErFeO3 allows tuning of SRT and spin-switching transitions\, as revealed
  by magnetization versus temperature measurements on single crystals of Er
 1-x SmxFeO3. Additionally\, the applied magnetic field and the sample hist
 ory - thermal and magnetic\, influence spin-switching transitions. In addi
 tion to orthorhombic structure\, RFeO3 compounds can stabilize in a metast
 able hexagonal phase when synthesized via the sol-gel method. In a hexagon
 al structure\, the magnetic ordering temperature (TN) rises as the c/a rat
 io increases\, and the latter is high when the rare-earth ionic radius is 
 small. Although the scandium ion is the smallest that can conveniently occ
 upy the A-site\, pure ScFeO3 is unstable in the hexagonal structure. This 
 study shows that 67% Sc-substituted LuFeO3 stabilizes in the hexagonal str
 ucture\, exhibiting magnetic ordering below 175 K and a high c/a ratio of 
 2.008. Neutron diffraction analysis indicates a mixed Γ1 + Γ2 magnetic s
 tructure\, while field-dependent dielectric measurements confirm a magneto
 -dielectric effect of up to 1.5%. Geometric frustration in magnetic lattic
 es hinders conventional magnetic ordering\, leading to exotic states such 
 as quantum spin liquid (QSL)\, which is characterized by the absence of lo
 ng-range magnetic ordering\, and highly entangled\, fluctuating ground sta
 tes that persist near absolute zero. Investigations of triangular lattice 
 SmTa7O19 using DC and AC magnetic susceptibility\, specific heat\, and μ
 SR measurements reveal no long-range order down to 30 mK\, with μSR (LF)
  confirming a fluctuating ground state typical of a QSL. Disorder in a lat
 tice often results in spin freezing. However\, recent research suggests th
 at disorder can enhance competing magnetic interactions and quantum fluctu
 ations\, stabilizing QSL states. Lu2CuTiO6 crystallizes in a hexagonal str
 ucture with random Cu and Ti distribution in the ab plane and forms a tria
 ngular lattice. AC susceptibility exhibits a small peak at 0.2 K\, but no 
 peak appears in the specific heat data at the same temperature. It suggest
 s that the origin of the peak is not long-range magnetic ordering. The abs
 ence of long-range magnetic ordering or freezing down to 50 mK makes this 
 material interesting for realizing a spin liquid state.\n\nhttps://indico.
 ifj.edu.pl/event/1780/
LOCATION:online via Zoom platform (IFJ PAN)
URL:https://indico.ifj.edu.pl/event/1780/
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