Random singlet-like state in the dimer-based triangular antiferromagnet Ba 6 Y 2 Rh 2 Ti 2 O 17 − δ

Lee, Wonjun; Yoon, Sungwon; Jeon, Sungmin; Cai, Yipeng; Kojima, Kenji; Nguyen, Loi T.; Cava, R. J.; Choi, Kwang-Yong; Lee, Suheon

doi:10.1103/PhysRevResearch.6.023225

Random singlet-like state in the dimer-based triangular antiferromagnet ${Ba}_{6} Y_{2} {Rh}_{2} {Ti}_{2} O_{17 - δ}$

Journal Article · Mon Jun 03 00:00:00 EDT 2024 · Physical Review Research

DOI:https://doi.org/10.1103/PhysRevResearch.6.023225· OSTI ID:2369753

; Yoon, Sungwon; Jeon, Sungmin; Cai, Yipeng; Kojima, Kenji; Nguyen, Loi T.; Cava, R. J.; Choi, Kwang-Yong;

We present the magnetic, thermodynamic, and muon spin relaxation ( $μ SR$ ) results of the dimer-based triangular antiferromagnet ${Ba}_{6} Y_{2} {Rh}_{2} {Ti}_{2} O_{17 - δ}$ . The magnetic susceptibility data show the sub-Curie-Weiss behavior $χ (T) \propto T^{- α_{χ}}$ below 100 K, suggesting random magnetism. The isothermal magnetization results reveal the presence of weakly interacting structural orphan spins about $6.1 %$ at 2 K, arising from the oxygen deficiency. The comprehensive $μ SR$ experiments exhibit the coexisting relaxing and nonrelaxing components along with the thermally activated behavior in the muon spin relaxation rate, reflecting the fluctuating orphan spins in the dimer singlet background. In addition, we observe the scaling behavior of $M (H, T)$ in $H / T$ and $P_{z} (t)$ in $t / H_{LF}$ with the scaling exponents $α_{χ} = α_{M} = 0.75$ and $α_{μ} = 0.72$ , respectively, but not for the magnetic specific heat data. The failure of the scaling relation in $C_{m} (H, T) / T$ implies low-energy excitations dressed by the conventional orphan spins. Based on these observations, we find that the magnetic ground state resembles random singlets and discuss the possible configurations of the spin dimer unit ${Rh}_{2} O_{9}$ . Our results shed light on the role of quenched disorder in the dimer-based frustrated magnets.

Published by the American Physical Society 2024

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

Grant/Contract Number:: SC0019331

OSTI ID:: 2369753

Journal Information:: Physical Review Research, Journal Name: Physical Review Research Journal Issue: 2 Vol. 6; ISSN PPRHAI; ISSN 2643-1564

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Random singlet-like state in the dimer-based triangular antiferromagnet ${Ba}_{6} Y_{2} {Rh}_{2} {Ti}_{2} O_{17 - δ}$