Bose-Einstein condensation of triplons in Ba3Cr2O8

Journal Article · Thu Jan 01 04:00:00 EST 2009 · Physical Review B Rapid Communication

OSTI ID:962353

Jaime, Marcelo ^[1]; Kohama, Y ^[1]; Aczel, A ^[2]; Ninios, K ^[3]; Chan, H ^[3]; Balicas, L ^[4]; Dabkowska, H ^[2]; Like, G ^[2]

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1. Los Alamos National Laboratory
2. MCMASTER UNIV
3. UNIV OF FL
4. NHMFL

By performing heat capacity, magnetocaloric effect, torque magnetometry and force magnetometry measurements up to 33 T, we have mapped out the T-H phase diagram of the S = 1/2 spin dimer compound Ba{sub 3}Cr{sub 2}O{sub 8}. We found evidence for field-induced magnetic order between H{sub cl} = 12.52(2) T and H{sub c2} = 23.65(5) T, with the maximum transition temperature T{sub c} {approx} 2.7 K at H {approx} 18 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, the nature of the upper phase transition appears to be quite different as our measurements suggest that this transition is actually first order.

• Research Organization: Los Alamos National Laboratory (LANL)
• Sponsoring Organization: DOE
• DOE Contract Number: AC52-06NA25396
• OSTI ID: 962353
• Report Number(s): LA-UR-09-01535; LA-UR-09-1535
• Journal Information: Physical Review B Rapid Communication, Journal Name: Physical Review B Rapid Communication; ISSN PRBOFW; ISSN 1089-4896
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BOSE-EINSTEIN CONDENSATION
DIMERS
MAGNETIZATION
PHASE DIAGRAMS
SPECIFIC HEAT
SPIN
TORQUE
TRANSITION TEMPERATURE