Maqola

Bose-Einstein condensation of triplons in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Ba</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>Cr</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mtext>O</mml:mtext><mml:mn>8</mml:mn></mml:msub></mml:mrow></mml:math>

A. A. AczelDepartment of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada, L8S 4M1Yoshimitsu KohamaNational High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USAM. JaimeNational High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USAK. NiniosDepartment of Physics, University of Florida, Gainesville, Florida 32611, USAH. B. ChanDepartment of Physics, University of Florida, Gainesville, Florida 32611, USALuis BalicasNational High Magnetic Field Laboratory, Tallahassee, Florida 32310, USAH. 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

By performing heat-capacity, magnetocaloric effect, torque magnetometry, and force magnetometry measurements up to 33 T, we have mapped out the $T\text{\ensuremath{-}}H$ phase diagram of the $S=1/2$ spin dimer compound ${\text{Ba}}_{3}{\text{Cr}}_{2}{\text{O}}_{8}$. We found evidence for field-induced magnetic order between ${H}_{c1}=12.52(2)\text{ }\text{T}$ and ${H}_{c2}=23.60(5)\text{ }\text{T}$, with the maximum transition temperature ${T}_{c}\ensuremath{\sim}2.7\text{ }\text{K}$ at $H\ensuremath{\sim}18\text{ }\text{T}$. The lower transition can likely be described by Bose-Einstein condensation of triplons theory, and this is consistent with the absence of any magnetization plateaus in our magnetic torque and force measurements. In contrast, our measurements uncovered magnetic field irreversibility associated with a symmetric specific heat versus temperature near ${H}_{c2}$ suggesting that the upper transition is first order.

Hali tarjima qilinmagan

Identifikatorlar

DOI: 10.1103/physrevb.79.100409

Iqtiboslar va manbalar

2 ta iqtibos0 ta foydalanilgan manba

Koʻrsatkichlar — AkademScholar