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Title: Signatures for spinons in the quantum spin liquid candidate Ca 10 Cr 7 O 28

Abstract

We present new experimental low-temperature heat capacity and detailed dynamical spin-structure factor data for the quantum spin-liquid candidate material Ca 10 Cr 7 O 28 . The measured heat capacity shows an almost-perfect linear temperature dependence in the range $0.1K ≲T≲ 0.5K$, reminiscent of fermionic spinon degrees of freedom. The spin-structure factor exhibits two energy regimes of strong signal which display rather different but solely diffuse scattering features. We theoretically describe these findings by an effective spinon-hopping model which crucially relies on the existence of strong ferromagnetically coupled triangles in the system. Our spinon theory is shown to naturally reproduce the overall weight distribution of the measured spin-structure factor. Particularly, we argue that various different observed characteristic properties of the spin-structure factor and the heat capacity consistently indicate the existence of a spinon Fermi surface. A closer analysis of the heat capacity at the lowest accessible temperatures hints toward the presence of weak f-wave spinon-pairing terms inducing a small partial gap along the Fermi surface (except for discrete nodal Dirac points) and suggesting an overall Z2 quantum spin-liquid scenario for Ca 10 Cr 7 O 28 .

Authors:
 [1]; ORCiD logo [2];  [3];  [3];  [4];  [5];  [4];  [6];  [1]
  1. Freie Univ., Berlin (Germany); Helmholtz-Zentrum Berlin (HZB), (Germany). German Research Centre for Materials and Energy
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Goethe Univ., Frankfurt (Germany)
  4. Helmholtz-Zentrum Berlin (HZB), (Germany). German Research Centre for Materials and Energy
  5. National Inst. of Standards and Technology (NIST), Boulder, CO (United States); Univ. of Maryland, College Park, MD (United States)
  6. Helmholtz-Zentrum Berlin (HZB), (Germany). German Research Centre for Materials and Energy; Technische Univ. Berlin (Germany)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1607143
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 17; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Quantum spin liquid; Specific heat; Spinon; Heisenberg model; Mean field theory; Neutron scattering

Citation Formats

Sonnenschein, Jonas, Balz, Christian, Tutsch, Ulrich, Lang, Michael, Ryll, Hanjo, Rodriguez-Rivera, Jose A., Islam, A. T. M. Nazmul, Lake, Bella, and Reuther, Johannes. Signatures for spinons in the quantum spin liquid candidate Ca10Cr7O28. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.174428.
Sonnenschein, Jonas, Balz, Christian, Tutsch, Ulrich, Lang, Michael, Ryll, Hanjo, Rodriguez-Rivera, Jose A., Islam, A. T. M. Nazmul, Lake, Bella, & Reuther, Johannes. Signatures for spinons in the quantum spin liquid candidate Ca10Cr7O28. United States. doi:https://doi.org/10.1103/PhysRevB.100.174428
Sonnenschein, Jonas, Balz, Christian, Tutsch, Ulrich, Lang, Michael, Ryll, Hanjo, Rodriguez-Rivera, Jose A., Islam, A. T. M. Nazmul, Lake, Bella, and Reuther, Johannes. Mon . "Signatures for spinons in the quantum spin liquid candidate Ca10Cr7O28". United States. doi:https://doi.org/10.1103/PhysRevB.100.174428. https://www.osti.gov/servlets/purl/1607143.
@article{osti_1607143,
title = {Signatures for spinons in the quantum spin liquid candidate Ca10Cr7O28},
author = {Sonnenschein, Jonas and Balz, Christian and Tutsch, Ulrich and Lang, Michael and Ryll, Hanjo and Rodriguez-Rivera, Jose A. and Islam, A. T. M. Nazmul and Lake, Bella and Reuther, Johannes},
abstractNote = {We present new experimental low-temperature heat capacity and detailed dynamical spin-structure factor data for the quantum spin-liquid candidate material Ca10Cr7O28. The measured heat capacity shows an almost-perfect linear temperature dependence in the range $0.1K ≲T≲ 0.5K$, reminiscent of fermionic spinon degrees of freedom. The spin-structure factor exhibits two energy regimes of strong signal which display rather different but solely diffuse scattering features. We theoretically describe these findings by an effective spinon-hopping model which crucially relies on the existence of strong ferromagnetically coupled triangles in the system. Our spinon theory is shown to naturally reproduce the overall weight distribution of the measured spin-structure factor. Particularly, we argue that various different observed characteristic properties of the spin-structure factor and the heat capacity consistently indicate the existence of a spinon Fermi surface. A closer analysis of the heat capacity at the lowest accessible temperatures hints toward the presence of weak f-wave spinon-pairing terms inducing a small partial gap along the Fermi surface (except for discrete nodal Dirac points) and suggesting an overall Z2 quantum spin-liquid scenario for Ca10Cr7O28.},
doi = {10.1103/PhysRevB.100.174428},
journal = {Physical Review B},
number = 17,
volume = 100,
place = {United States},
year = {2019},
month = {11}
}

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