Strong Damping of Phononic Heat Current by Magnetic Excitations in SrCu 2 ( BO 3 ) 2 </mml:mrow…
2001; American Physical Society; Volume: 87; Issue: 4 Linguagem: Inglês
10.1103/physrevlett.87.047202
ISSN1092-0145
AutoresMartin R. Hofmann, T. Lorenz, Götz S. Uhrig, H. Kierspel, Oleg Zabara, A. Freimuth, Hiroshi Kageyama, Yutaka Ueda,
Tópico(s)Physics of Superconductivity and Magnetism
ResumoMeasurements of the thermal conductivity as a function of temperature and magnetic field in the 2D dimer spin system SrCu2(BO3)(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.
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