Thermally populated versus field-induced triplon bound states in the Shastry-Sutherland lattice SrCu2(BO3)(2)

authored by

Dirk Wulferding, Youngsu Choi, Seungyeol Lee, Mikhail A. Prosnikov, Yann Gallais, Peter Lemmens, Chengchao Zhong, Hiroshi Kageyama, Kwang-Yong Choi

Abstract

The Shastry–Sutherland compound SrCu

₂(BO

₃)

₂ constituting orthogonally coupled dimers harbors an S = 0 singlet ground state. The confluence of strong interdimer interaction and frustration engenders a spectrum of low-energy excitations including localized triplons as well as singlet and triplet bound states. Their dynamics are controlled by an external magnetic field and temperature. Here, we employ high-field Raman spectroscopy to map the field and temperature evolution of such bosonic composite quasiparticles on approaching the 1/8 magnetization plateau. Our study unveils that the magnetic field and thermal fluctuations show remarkably similar effects in melting the singlet bound states, but are disparate in their effects on the fine spectral shapes. This, together with the anti-crossing of two singlet bound states in the intermediate field B = 10 − 16 T, is discussed in terms of the correlated dynamics of frustrated, interacting bosons.

Type

Other publication

Volume

Publication date

17.12.2021

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials, Condensed Matter Physics

Electronic version(s)

https://doi.org/10.1038/s41535-021-00405-7 (Access: Open)

BibTeX

@misc{22dcf04102f8456989a34a7251affc69,
title = "Thermally populated versus field-induced triplon bound states in the Shastry-Sutherland lattice SrCu2(BO3)(2)",
abstract = "The Shastry–Sutherland compound SrCu 2(BO 3) 2 constituting orthogonally coupled dimers harbors an S = 0 singlet ground state. The confluence of strong interdimer interaction and frustration engenders a spectrum of low-energy excitations including localized triplons as well as singlet and triplet bound states. Their dynamics are controlled by an external magnetic field and temperature. Here, we employ high-field Raman spectroscopy to map the field and temperature evolution of such bosonic composite quasiparticles on approaching the 1/8 magnetization plateau. Our study unveils that the magnetic field and thermal fluctuations show remarkably similar effects in melting the singlet bound states, but are disparate in their effects on the fine spectral shapes. This, together with the anti-crossing of two singlet bound states in the intermediate field B = 10 − 16 T, is discussed in terms of the correlated dynamics of frustrated, interacting bosons. ",
author = "Dirk Wulferding and Youngsu Choi and Seungyeol Lee and Prosnikov, {Mikhail A.} and Yann Gallais and Peter Lemmens and Chengchao Zhong and Hiroshi Kageyama and Kwang-Yong Choi",
note = "Funding information: This work was supported by the Institute for Basic Science in Korea (Grant No. IBS-R009-Y3), and by HFML-RU/NWO-I, a member of the European Magnetic Field Laboratory (EMFL). K.-Y.C., Y.G., Y.C., and S.L. acknowledge funding from “PHC Star Grant 2020” (Grant No. 45827YG). K.-Y.C. was supported by the National Research Foundation (NRF) of Korea (Grant Nos. 2020R1A2C3012367 and 2020R1A5A1016518). P.L. was supported by DFG Excellence Cluster QuantumFrontiers, EXC 2123, DFG Le967/16-1, DFG-RTG 1952/1, and the Quantum-and Nano-Metrology (QUANOMET) initiative of Lower Saxony within project NL-4.",
year = "2021",
month = dec,
day = "17",
doi = "10.1038/s41535-021-00405-7",
language = "English",
volume = "6",
series = "npj Quantum Materials",
edition = "1",
type = "Other",
}