Stability of the spiral spin liquid in MnSc2S4

Yasir Iqbal, Tobias Müller, Harald Olaf Jeschke, Ronny Thomale, Johannes Reuther

    Research output: Contribution to journalArticlepeer-review

    18 Citations (Scopus)

    Abstract

    We investigate the stability of the spiral spin liquid phase in MnSc2S4 against thermal and quantum fluctuations as well as against perturbing effects of longer-range interactions. Employing ab initio density functional theory (DFT) calculations we propose a realistic Hamiltonian for MnSc2S4, featuring second (J2) and third (J3) neighbor Heisenberg interactions on the diamond lattice that are considerably larger than previously assumed. We argue that the combination of strong J2 and J3 couplings reproduces the correct magnetic Bragg peak position measured experimentally. Calculating the spin-structure factor within the pseudofermion functional-renormalization group technique, we find that close to the magnetic phase transition the sizable J3 couplings induce a strong spiral selection effect, in agreement with experiments. With increasing temperature the spiral selection becomes weaker such that in a window around three to five times the ordering temperature an approximate spiral spin liquid is realized in MnSc2S4.

    Original languageEnglish
    Article number064427
    JournalPhysical Review B
    Volume98
    Issue number6
    DOIs
    Publication statusPublished - Aug 31 2018

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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