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Effect of pressure on the quantum spin ladder material IPA-CuCl3

Tao Hong, V. O. Garlea, A. Zheludev, J. A. Fernandez-Baca, H. Manaka, S. Chang, J. B. Leao, and S. J. Poulton
Phys. Rev. B 78, 224409 – Published 10 December 2008
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  • INTRODUCTION
  • BULK MEASUREMENTS
  • NEUTRON-SCATTERING MEASUREMENTS
  • DATA ANALYSIS AND DISCUSSION
  • ACKNOWLEDGEMENTS
    • References

    Abstract

    Inelastic-neutron-scattering and bulk magnetic-susceptibility studies of the quantum S=1/2 spin ladder system (CH3)2CHNH3CuCl3 are performed under hydrostatic pressure. The pressure dependence of the spin gap Δ is determined. At P=1500 MPa it is reduced to Δ=0.79 meV from Δ=1.17 meV at ambient pressure. The results allow us to predict a soft-mode quantum phase transition in this system at Pc∼4 GPa. The measurements are complicated by the proximity of a structural phase transition that leads to a deterioration of the sample.

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    • Received 8 September 2008

    DOI:https://doi.org/10.1103/PhysRevB.78.224409

    ©2008 American Physical Society

    Authors & Affiliations

    Tao Hong, V. O. Garlea, A. Zheludev, and J. A. Fernandez-Baca

    • Neutron Scattering Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393, USA

    H. Manaka

    • Graduate School of Science and Engineering, Kagoshima University, Korimoto, Kagoshima 890-0065, Japan

    S. Chang, J. B. Leao, and S. J. Poulton*

    • NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA

    • *Also at Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA.

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    Issue

    Vol. 78, Iss. 22 — 1 December 2008

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    Images

    • Figure 1
      Figure 1
      Temperature dependence of the magnetic susceptibility in IPA-CuCl3 is measured at various pressures in a dc field of 1 T. Samples previously pressurized to 810 MPa (solid circles) show a behavior different from that of never pressurized ones (open circles), but similar to that of those that have gone a structural transition at T=323 K at ambient pressure (half-filled circles). The error bars are smaller than the data points. The arrow indicates a nonactivated contribution at T→0.Reuse & Permissions
    • Figure 2
      Figure 2
      Typical constant-q scans (raw data) collected at the magnetic zone center in IPA-CuCl3 at (a) P=620 MPa using setup 1 (symbols) and (b) P=1500 MPa using setup 2 (symbols). The solid lines are a model for the background contribution, as described in the text. Error bars represent one standard deviation determined assuming Poisson statistics.Reuse & Permissions
    • Figure 3
      Figure 3
      Background-subtracted constant-q scans collected in IPA-CuCl3 at the magnetic zone center at various pressures (symbols). The solid lines are fits to the data based on a model cross section function convoluted with the spectrometer resolution, as described in the text. The arrow indicates a broadening of the inelastic peak or extra intensity inside the gap.Reuse & Permissions
    • Figure 4
      Figure 4
      Pressure dependence of the spin gap in IPA-CuCl3 measured using inelastic neutron scattering at T=1.5 K. A linear extrapolation suggests a soft-mode quantum phase transition at Pc≈4 GPa.Reuse & Permissions
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