Strong Damping of Phononic Heat Current by Magnetic Excitations in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>SrCu</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow><mo>(</mo><mrow><msub><mrow><mi>BO</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow><mrow><msub><mrow><mo>)</mo></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span>

M. Hofmann; T. Lorenz; G. S. Uhrig; H. Kierspel; O. Zabara; A. Freimuth; H. Kageyama; Y. Ueda

doi:10.1103/PhysRevLett.87.047202

Strong Damping of Phononic Heat Current by Magnetic Excitations in ${SrCu}_{2} ({BO}_{3})_{2}$

M. Hofmann, T. Lorenz, G. S. Uhrig, H. Kierspel, O. Zabara, A. Freimuth, H. Kageyama, and Y. Ueda

Phys. Rev. Lett. 87, 047202 – Published 5 July 2001

Abstract

Measurements of the thermal conductivity as a function of temperature and magnetic field in the 2D dimer spin system ${SrCu}_{2} ({BO}_{3})_{2}$ are presented. In zero magnetic field the thermal conductivity along and perpendicular to the magnetic planes shows a pronounced double-peak structure as a function of temperature. The low-temperature maximum is drastically suppressed with increasing magnetic field. Our quantitative analysis reveals that the heat current is due to phonons and that the double-peak structure arises from pronounced resonant scattering of phonons by magnetic excitations.

Received 28 February 2001

DOI:https://doi.org/10.1103/PhysRevLett.87.047202

Authors & Affiliations

M. Hofmann¹, T. Lorenz¹, G. S. Uhrig², H. Kierspel¹, O. Zabara¹, A. Freimuth¹, H. Kageyama³, and Y. Ueda³

¹II. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
²Institut für Theoretische Physik, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
³Institute for Solid State Physics, University of Tokyo, Kashiwanoha 5-1-5 Kashiwa, Chiba 277-8581, Japan