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Field-Induced Bose-Einstein Condensation of Triplons up to 8 K in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Sr</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>Cr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="bold">O</mml:mi><mml:mn>8</mml:mn></mml:msub></mml:math>

A. A. AczelDepartment of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada, L8S 4M1Yoshimitsu KohamaMPA-CMMS, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USAC. MarcenatCEA-Grenoble, Institut Nanosciences et Cryognie, SPSMS-LATEQS, 17 rue des Martyrs, 38054 Grenoble Cedex 9, FranceFranziska WeickertMax Planck Institute for Chemical Physics of Solids, 01187 Dresden, GermanyM. JaimeMPA-CMMS, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USAOscar Ayala-ValenzuelaMPA-CMMS, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USAR. McDonaldMPA-CMMS, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USAS. D. SelesnicDepartment of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada, L8S 4M1H. A. DabkowskaBrockhouse Institute for Materials Research, McMaster University, Hamilton, Ontario, Canada, L8S 4M1G. M. LukeBrockhouse Institute for Materials Research, McMaster University, Hamilton, Ontario, Canada, L8S 4M1

2009lv

ABI

Annotatsiya

Single crystals of the spin dimer system ${\mathrm{Sr}}_{3}{\mathrm{Cr}}_{2}{\mathrm{O}}_{8}$ have been grown for the first time. Magnetization, heat capacity, and magnetocaloric effect data up to 65 T reveal magnetic order between applied fields of ${H}_{c1}\ensuremath{\sim}30.4\text{ }\text{ }\mathrm{T}$ and ${H}_{c2}\ensuremath{\sim}62\text{ }\text{ }\mathrm{T}$. This field-induced order persists up to ${T}_{c}^{\mathrm{max}}\ensuremath{\sim}8\text{ }\text{ }\mathrm{K}$ at $H\ensuremath{\sim}44\text{ }\text{ }\mathrm{T}$, the highest observed in any quantum magnet where ${H}_{c2}$ is experimentally accessible. We fit the temperature-field phase diagram boundary close to ${H}_{c1}$ using the expression ${T}_{c}=A(H\mathrm{\text{\ensuremath{-}}}{H}_{c1}{)}^{\ensuremath{\nu}}$. The exponent $\ensuremath{\nu}=0.65(2)$, obtained at temperatures much smaller than ${T}_{c}^{\mathrm{max}}$, is that of the 3D Bose-Einstein condensate (BEC) universality class. This finding strongly suggests that ${\mathrm{Sr}}_{3}{\mathrm{Cr}}_{2}{\mathrm{O}}_{8}$ is a new realization of a triplon BEC where the universal regimes corresponding to both ${H}_{c1}$ and ${H}_{c2}$ are accessible at $^{4}\mathrm{He}$ temperatures.

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DOI: 10.1103/physrevlett.103.207203

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