Comment on “Transition from Bose glass to a condensate of triplons in Tl<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow/><mml:mrow><mml:mn>1</mml:mn><mml:mo>–</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>K<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow/><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>CuCl<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow/><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>”
A. ZheludevLaboratory for Solid State Physics, Eidgen¨ossische Technische Hochschule Z¨urich, SwitzerlandD. HüvonenLaboratory for Solid State Physics, Eidgen¨ossische Technische Hochschule Z¨urich, Switzerland
2011lv
ABI
Abstract
We argue that the interpretation of the calorimetric data for disordered quantum antiferromagnets Tl${}_{1--x}$K${}_{x}$CuCl${}_{3}$ in terms of Bose glass physics by F. Yamada et al. in [Phys. Rev. B 83, 020409(R) (2011)] is not unambiguous. A consistent analysis shows no difference in the crossover critical index for the disorder-free TlCuCl${}_{3}$ and its disordered derivatives. Furthermore, we question the very existence of a proper field-induced thermodynamic phase transition in Tl${}_{1--x}$K${}_{x}$CuCl${}_{3}$.
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Cited by 20 references