Quantum magnetism and quantum phase transitions

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High-resolution resonant inelastic x-ray scattering study of the electron-phonon coupling in honeycomb $\alpha$-Li$_2$IrO$_3$

(2019)

Authors:

JG Vale, CD Dashwood, E Paris, LSI Veiga, M Garcia-Fernandez, A Nag, A Walters, KJ Zhou, I-M Pietsch, A Jesche, P Gegenwart, R Coldea, T Schmitt, DF McMorrow
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Modular thermal Hall effect measurement setup for fast-turnaround screening of materials over wide temperature range using capacitive thermometry

Review of Scientific Instruments AIP Publishing 90:10 (2019) 103904-103904

Authors:

Ha-Leem Kim, Matthew John Coak, JC Baglo, Keiron Murphy, RW Hill, Michael Sutherland, M Ciomaga Hatnean, Geetha Balakrishnan, Je-Geun Park
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Chemical tuning between triangular and honeycomb structures in a 5$d$ spin-orbit Mott insulator

(2019)

Authors:

RD Johnson, I Broeders, K Mehlawat, Y Li, Y Singh, R Valenti, R Coldea
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A series of magnon crystals appearing under ultrahigh magnetic fields in a kagomé antiferromagnet

ArXiv 1903.07283 (2019)

Authors:

R Okuma, D Nakamura, T Okubo, A Miyake, A Matsuo, K Kindo, M Tokunaga, N Kawashima, S Takeyama, Z Hiroi
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A series of magnon crystals appearing under ultrahigh magnetic fields in a kagomé antiferromagnet.

Nature communications 10:1 (2019) 1229

Authors:

R Okuma, D Nakamura, T Okubo, A Miyake, A Matsuo, K Kindo, M Tokunaga, N Kawashima, S Takeyama, Z Hiroi

Abstract:

Geometrical frustration and a high magnetic field are two key factors for realizing unconventional quantum states in magnetic materials. Specifically, conventional magnetic order can potentially be destroyed by competing interactions and may be replaced by an exotic state that is characterized in terms of quasiparticles called magnons, the density and chemical potential of which are controlled by the magnetic field. Here we show that a synthetic copper mineral, Cd-kapellasite, which comprises a kagomé lattice consisting of corner-sharing triangles of spin-1/2 Cu2+ ions, exhibits an unprecedented series of fractional magnetization plateaus in ultrahigh magnetic fields of up to 160 T. We propose that these quantum states can be interpreted as crystallizations of emergent magnons localized on the hexagon of the kagomé lattice.
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