Possible Quantum Paramagnetism in Compressed Sr2IrO4

Autor(es):Mostrar menos -

Haskel, D. ^[1] ; Fabbris, G. ^[1] ; Kim, J. H. ^[1] ; Veiga, L. S. I. ^{[2, 1, 3, 4, 5]} ; Mardegan, J. R. L. ^{[2, 1]} ; Escanhoela, Jr., C. A. ^{[1, 3]} ; Chikara, S. ^[1] ; Struzhkin, V. ^[6] ; Senthil, T. ^[7] ; Kim, B. J. ^{[8, 9]} ; Cao, G. ^[10] ; Kim, J. -W. ^[1]

Afiliação do(s) autor(es)

^[1] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 - USA

^[2] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil

^[3] Brazilian Synchrotron Light Lab LNLS, BR-13083970 Campinas, SP - Brazil

^[4] UCL, Dept Phys & Astron, Gower St, London WC1E 6BT - England

^[5] UCL, London Ctr Nanotechnol, Gower St, London WC1E 6BT - England

^[6] Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 - USA

^[7] MIT, Dept Phys, Cambridge, MA 02139 - USA

^[8] Pohang Univ Sci & Technol, Dept Phys, Pohang 790784 - South Korea

^[9] Inst for Basic Sci Korea, Ctr Artificial Low Dimens Elect Syst, 77 Cheongam Ro, Pohang 790784 - South Korea

^[10] Univ Colorado, Dept Phys, Boulder, CO 80309 - USA

• Tipo de documento: Artigo Científico
• Fonte: Physical Review Letters; v. 124, n. 6 FEB 11 2020.
• Citações Web of Science: 1

Resumo

The effect of compression on the magnetic ground state of Sr2IrO4 is studied with x-ray resonant techniques in the diamond anvil cell. The weak interlayer exchange coupling between square-planar 2D IrO2 layers is readily modified upon compression, with a crossover between magnetic structures around 7 GPa mimicking the effect of an applied magnetic field at ambient pressure. Higher pressures drive an order-disorder magnetic phase transition with no magnetic order detected above 17-20 GPa. The persistence of strong exchange interactions between J(eff) = 1/2 magnetic moments within the insulating IrO2 layers up to at least 35 GPa points to a highly frustrated magnetic state in compressed Sr2IrO4, opening the door for realization of novel quantum paramagnetic phases driven by extended 5d orbitals with entangled spin and orbital degrees of freedom. (AU)

• Processo FAPESP: 13/14338-3 - Competição entre supercondutividade e magnetismo em sistemas sob pressão e filmes finos
• Beneficiário: Larissa Sayuri Ishibe Veiga
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado