Finite field regime for a quantum spin liquid in α–RuCl3

Balz, Christian; Lampen-Kelley, Paula; Banerjee, Arnab; Yan, Jiaqiang; Lu, Zhilun; Hu, Xinzhe; Yadav, Swapnil M.; Takano, Yasu; Liu, Yaohua; Tennant, D. Alan; Lumsden, Mark D.; Mandrus, David; Nagler, Stephen E.

doi:10.1103/PhysRevB.100.060405

Title: Finite field regime for a quantum spin liquid in $α – {RuCl}_{3}$

Journal Article · Mon Aug 12 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.100.060405· OSTI ID:1557509

^[1]; Lampen-Kelley, Paula ^[2];

^[1];

^[1]; Lu, Zhilun ^[3]; Hu, Xinzhe ^[4]; Yadav, Swapnil M. ^[4]; Takano, Yasu ^[4];

^[1];

^[1]; Mandrus, David ^[2];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin (Germany)
Univ. of Florida, Gainesville, FL (United States)

An external magnetic field can cause a transition in $α – {RuCl}_{3}$ from an ordered zigzag state to a disordered state that is possibly related to the Kitaev quantum spin liquid. Here, we present field-dependent inelastic neutron scattering and magnetocaloric effect measurements implying the existence of an additional transition out of the quantum spin-liquid phase at an upper field limit B_u. The neutron scattering reveals three distinct regimes of magnetic response. In the low-field ordered state the response shows magnon peaks; the intermediate-field regime shows only continuum scattering, and above B_u the response shows sharp magnon peaks at the lower bound of a strong continuum. Measurable dispersion of magnon modes along the (0,0,L) direction implies non-negligible interplane interactions. Combining the magnetocaloric effect measurements with other data, a T–B phase diagram is constructed. The results constrain the range where one might expect to observe quantum spin-liquid behavior in $α – {RuCl}_{3}$ .

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Helmholtz-Zentrum Berlin

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1557509

Journal Information:: Physical Review B, Vol. 100, Issue 6; ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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