Fragile Magnetic Ground State in Half-Doped LaSr(2)Mn(2)O(7)

Lee, J; Kao, C; Nelson, C; Jang, H; Ko, K; Kim, S; Choi, Y; Cheong, S; Smadici, S

doi:10.1103/PhysRevLett.107.037206

Fragile Magnetic Ground State in Half-Doped LaSr(2)Mn(2)O(7)

Journal Article · Sat Dec 31 04:00:00 EST 2011 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.107.037206· OSTI ID:1041688

Lee, J; Kao, C; Nelson, C; Jang, H; Ko, K; Kim, S; Choi, Y; Cheong, S; Smadici, S

We investigated the orbital and antiferromagnetic ordering behaviors of the half-doped bilayer manganite La{sub 2-2x}Sr{sub 1+2x}Mn{sub 2}O{sub 7} (x {approx_equal} 0.5) by using Mn L{sub 2,3}-edge resonant soft x-ray scattering. Resonant soft x-ray scattering reveals the CE-type orbital order below T{sub oo} {approx_equal} 220 K, which shows partial melting behavior below T{sub m} {approx_equal}65 K. We also found coexistence CE- and A-type antiferromagnetic orders. Both orders involve the CE-type orbital order with nearly the same orbital character and are coupled with each other. These results manifest that the ground state with the CE-type antiferromagnetic order is easily susceptible to destabilization into the A-type one even with a small fluctuation of the doping level, as suggested by the extremely narrow magnetic phase boundaries at x {approx_equal} x {yields} 0.5 {+-} 0.005.

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Research Foundation of Korea (NRF)

DOE Contract Number:: AC02-98CH10886

OSTI ID:: 1041688

Report Number(s):: BNL--97366-2012-JA

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 3 Vol. 107; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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