Possible quantum paramagnetism in compressed Sr2IrO4
D. Haskel, G. Fabbris, J. H. Kim, L. S. I. Veiga, J. R. L. Mardegan, C. A. Escanhoela, S. Chikara, V. Struzhkin, T. Senthil, B. J. Kim, G. Cao and J.-W. Kim
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Agradecimentos: Work at Argonne was supported by the U.S. DOE Office of Science, Office of Basic Energy Sciences, under Award No. DE-AC02-06CH11357. We thank GSE-CARS for use of their DAC gas loading facility [77]. G. C. acknowledges NSF support via Grants No. DMR 1712101 and No. 1903888. B. J. K....
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Agradecimentos: Work at Argonne was supported by the U.S. DOE Office of Science, Office of Basic Energy Sciences, under Award No. DE-AC02-06CH11357. We thank GSE-CARS for use of their DAC gas loading facility [77]. G. C. acknowledges NSF support via Grants No. DMR 1712101 and No. 1903888. B. J. K. was supported by IBS-R014-A2. L. S. I. V. was partly supported by FAPESP (SP-Brazil) under Contract No. 2013/14338-3. Work at UCL is supported by the UK Engineering and Physical Sciences Research Council (Grants No. EP/N027671/1 and No. EP/N034694/1)
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Abstract: 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...
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Abstract: 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
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FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP
2013/14338-3
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Possible quantum paramagnetism in compressed Sr2IrO4
D. Haskel, G. Fabbris, J. H. Kim, L. S. I. Veiga, J. R. L. Mardegan, C. A. Escanhoela, S. Chikara, V. Struzhkin, T. Senthil, B. J. Kim, G. Cao and J.-W. Kim
Possible quantum paramagnetism in compressed Sr2IrO4
D. Haskel, G. Fabbris, J. H. Kim, L. S. I. Veiga, J. R. L. Mardegan, C. A. Escanhoela, S. Chikara, V. Struzhkin, T. Senthil, B. J. Kim, G. Cao and J.-W. Kim
Fontes
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Physical review letters Vol. 124, n. 6 (Feb., 2020), n. art. 67201, p. 1-7 |