Magnetic properties of a quantum spin ladder in proximity to the isotropic limit

S. A. Zvyagin, A. N. Ponomaryov, M. Ozerov, E. Schulze, Y. Skourski, R. Beyer, T. Reimann, L. I. Zviagina, E. L. Green, J. Wosnitza, I. Sheikin, P. Bouillot, T. Giamarchi, J. L. Wikara, M. M. Turnbull, and C. P. Landee

Phys. Rev. B 103, 205131 – Published 18 May 2021

Abstract

We report on the synthesis, crystal structure, magnetic, thermodynamic, and electron-spin-resonance properties of the coordination complex $[{Cu}_{2} {(pz)}_{3} {(4 − HOpy)}_{4}] {({ClO}_{4})}_{4}$ (pz=pyrazine; 4-HOpy=4-hydroxypyridine). This material is identified as a spin-1/2 Heisenberg ladder system with exchange-coupling parameters $J_{r u n g} / k_{B} = 12.1 (1) K$ and $J_{l e g} / k_{B} = 10.5 (3) K$ $[J_{r u n g} / J_{l e g} = 1.15 (4)]$ . For single crystals our measurements revealed two critical fields, $μ_{0} H_{c 1} = 4.63 (5) T$ and $μ_{0} H_{c 2} = 22.78 (5) T$ (for $H ∥ a^{*}$ ), separating the gapped spin-liquid, gapless Tomonaga-Luttinger-liquid, and fully spin-polarized phase. No signature of a field-induced transition into a magnetically ordered phase was found at temperatures down to 450 mK. The material bridges an important gap by providing an excellent physical realization of an almost isotropic spin-1/2 strong-rung Heisenberg ladder system with modest exchange-coupling energy and critical-field scales.

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Received 16 February 2021
Revised 27 April 2021
Accepted 28 April 2021

DOI:https://doi.org/10.1103/PhysRevB.103.205131

Physics Subject Headings (PhySH)

Quantum criticality

Quantum spin models

Electron spin resonance

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

S. A. Zvyagin ^1,*, A. N. Ponomaryov ^1,†, M. Ozerov ^1,‡, E. Schulze^1,2, Y. Skourski¹, R. Beyer¹, T. Reimann ¹, L. I. Zviagina¹, E. L. Green ^1,‡, J. Wosnitza^1,2, I. Sheikin³, P. Bouillot⁴, T. Giamarchi ⁴, J. L. Wikara⁵, M. M. Turnbull ⁶, and C. P. Landee ^7,§

¹Dresden High Magnetic Field Laboratory (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, D-01328 Dresden, Germany
²Institut für Festkörper- und Materialphysik, TU Dresden, D-01062 Dresden, Germany
³Laboratoire National des Champs Magnétiques Intenses (LNCMI-EMFL), CNRS, UGA, F-38042 Grenoble, France
⁴Department of Quantum Matter Physics, University of Geneva, CH-1211 Geneva, Switzerland
⁵School of Physical and Chemical Sciences, University of Canterbury, Christchurch 8041, New Zealand
⁶Carlson School of Chemistry and Biochemistry, Clark University, Worcester, Massachusetts 01060, USA
⁷Department of Physics and Carlson School of Chemistry, Clark University, Worcester, Massachusetts 01060, USA

^*Corresponding author: s.zvyagin@hzdr.de
^†Present address: Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany.
^‡Present address: National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA.
^§Corresponding author: clandee@clarku.edu

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Vol. 103, Iss. 20 — 15 May 2021

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