Observation of triplet hole pairs and glassy spin waves in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">La</mi></mrow><mrow><mn>2</mn><mo>−</mo><mi>x</mi><mo>−</mo><mi>z</mi></mrow></msub></mrow><mrow><msub><mrow><mi mathvariant="normal">Sr</mi></mrow><mrow><mi>x</mi></mrow></msub></mrow><mi mathvariant="normal">Cu</mi><mrow><msub><mrow><mi mathvariant="normal">O</mi></mrow><mrow><mn>4</mn><mo>−</mo><mi>y</mi></mrow></msub></mrow></math></span> by electron spin resonance

H. Thomann; R. A. Klemm; D. C. Johnston; P. J. Tindall; H. Jin; D. P. Goshorn

doi:10.1103/PhysRevB.38.6552

Observation of triplet hole pairs and glassy spin waves in ${La}_{2 - x - z} {Sr}_{x} Cu O_{4 - y}$ by electron spin resonance

H. Thomann, R. A. Klemm, D. C. Johnston, P. J. Tindall, H. Jin, and D. P. Goshorn

Phys. Rev. B 38, 6552 – Published 1 October 1988

Abstract

We have systematically studied ${La}_{2 - x - z} {Sr}_{x} Cu O_{4 - y}$ by ESR. For hole concentration $h = 1 + 3 z + x - 2 y > 1$ , the ground state most probably contains triplet hole pairs. For $y > 0$ , excitations of the anisotropic quantum spin fluid (AQSF) (with rather long-range dynamic order) are observed for $180 < T < 470$ K. The AQSF freezes into an anisotropic quantum spin glass at $T_{SG} ≃ 100$ K (where phonon anomalies also occur), implying spin-phonon and competing spin-spin interactions are important. Below $T_{SG}$ , two spin-wave-like resonances are observed, suggesting local symmetry breaking of the third spin degree of freedom.

Received 23 June 1988

DOI:https://doi.org/10.1103/PhysRevB.38.6552

Authors & Affiliations

H. Thomann

Corporate Research Science Laboratories, Exxon Research and Engineering Company, Annandale, New Jersey 08801
Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11790

R. A. Klemm

Department of Physics, University of California at San Diego, La Jolla, California 92093
Ames Laboratory, U.S. Department of Energy and Department of Physics, Iowa State University, Ames, Iowa 50011

D. C. Johnston

Ames Laboratory, U.S. Department of Energy and Department of Physics, Iowa State University, Ames, Iowa 50011
Corporate Research Science Laboratories, Exxon Research and Engineering Company, Annandale, New Jersey 08801

P. J. Tindall, H. Jin, and D. P. Goshorn

Corporate Research Science Laboratories, Exxon Research and Engineering Company, Annandale, New Jersey 08801

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Vol. 38, Iss. 10 — 1 October 1988

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