Evidence for pressure induced unconventional quantum criticality in the coupled spin ladder antiferromagnet C9H18N2CuBr4

Hong, Tao; Ying, Tao; Huang, Qing; Dissanayake, Sachith E.; Qiu, Yiming; Turnbull, Mark M.; Podlesnyak, Andrey A.; Wu, Yan; Cao, Huibo; Liu, Yaohua; Umehara, Izuru; Gouchi, Jun; Uwatoko, Yoshiya; Matsuda, Masaaki; Tennant, David A.; Chern, Gia-Wei; Schmidt, Kai P.; Wessel, Stefan

doi:10.1038/s41467-022-30769-8

Title: Evidence for pressure induced unconventional quantum criticality in the coupled spin ladder antiferromagnet C₉H₁₈N₂CuBr₄

Journal Article · Thu Jun 02 00:00:00 EDT 2022 · Nature Communications

DOI:https://doi.org/10.1038/s41467-022-30769-8· OSTI ID:1872875

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^[10]; Chern, Gia-Wei ^[11]; Schmidt, Kai P. ^[12];

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Harbin Institute of Technology (China)
Univ. of Tennessee, Knoxville, TN (United States)
Duke Univ., Durham, NC (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Clark Univ., Worcester, MA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Atmospheric Radiation Measurement (ARM) Archive
Yokohama National University (Japan)
Univ. of Tokyo, Kashiwa, Chiba (Japan). Institute for Solid State Physics
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Virginia, Charlottesville, VA (United States)
Freidrich Alexander Univ. Erlangen-Nürnberg (FAU), Erlangen (Germany)
RWTH Aachen Univ. (Germany)

Quantum phase transitions in quantum matter occur at zero temperature between distinct ground states by tuning a nonthermal control parameter. Often, they can be accurately described within the Landau theory of phase transitions, similarly to conventional thermal phase transitions. However, this picture can break down under certain circumstances. Here, we present a comprehensive study of the effect of hydrostatic pressure on the magnetic structure and spin dynamics of the spin-1/2 ladder compound C₉H₁₈N₂CuBr₄. Single-crystal heat capacity and neutron diffraction measurements reveal that the Néel-ordered phase breaks down beyond a critical pressure of Pc~1.0 GPa through a continuous quantum phase transition. Estimates of the critical exponents suggest that this transition may fall outside the traditional Landau paradigm. The inelastic neutron scattering spectra at 1.3 GPa are characterized by two well-separated gapped modes, including one continuum-like and another resolution-limited excitation in distinct scattering channels, which further indicates an exotic quantum-disordered phase above Pc.

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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)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1872875

Journal Information:: Nature Communications, Vol. 13, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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