Suppressed incommensurate order in swedenborgite Ca0.5Y0.5BaCo4O7

Gao, Shang; Kocsis, Vilmos; Soda, Minoru; Ye, Feng; Liu, Yaohua; May, Andrew F.; Taguchi, Yasujiro; Tokura, Yoshinori; Arima, Taka-hisa; Schweika, Werner; Christianson, Andrew; Stone, Matthew B.

doi:10.1103/physrevb.104.l140408

Suppressed incommensurate order in swedenborgite Ca_0.5Y_0.5BaCo₄O₇

Journal Article · Mon Oct 18 00:00:00 EDT 2021 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.104.l140408· OSTI ID:1828259

^[1]; Kocsis, Vilmos ^[2]; Soda, Minoru ^[3]; ^[4]; ^[4]; ^[4]; ^[5]; Tokura, Yoshinori ^[6]; Arima, Taka-hisa ^[6]; Schweika, Werner ^[7]; ^[4]; ^[4]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Inst. of Physical and Chemical Research (RIKEN), Wako (Japan)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Inst. fur Festkorperforschung, Dresden (Germany)
Inst. of Physical and Chemical Research (RIKEN), Wako (Japan); Ochanomizu Univ., Tokyo (Japan)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Inst. of Physical and Chemical Research (RIKEN), Wako (Japan)
Inst. of Physical and Chemical Research (RIKEN), Wako (Japan); Univ. of Tokyo (Japan)
Forschungszentrum Juelich (Germany); European Spallation Source (ESS), Lund (Sweden)

Swedenborgite Ca_0.5Y_0.5BaCo₄O₇ (CYBCO) with geometrically frustrated kagome and triangular lattices exhibits a disordered ground state in spite of strong antiferromagnetic couplings between the Co spins. The character of the disordered state has been debated due to ambiguous Co states in the triangular layers. Here, we perform single-crystal diffuse neutron scattering experiments to fully characterize the short-range spin correlations in CYBCO. Through reverse Monte Carlo and self-consistent Gaussian approximation analyses, we confirm that the Co ions in both the kagome and triangular layers are magnetic, and the interlayer couplings, together with the lattice distortion, promote an incommensurate magnetic order that is suppressed possibly by exchange disorder. Our work clarifies the short-range spin correlations in CYBCO and establishes a general correspondence between unequal interactions and incommensurate spin correlations on the swedenborgite lattice.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1828259

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 14 Vol. 104; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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