Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.137207
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Funding
- Division of Scientific User Facilities, Office of BES, DOE
- NSF [DMR-0306940, DMR-0706553, DMR-0454672, DMR-0654118]
- Ministry of Education, Science, Sports, and Culture of Japan [19740218, 21110522, 22014014]
- ESF
- EuroHorcs through EURYI
- Danish Natural Science Research Council under DANSCATT
- Swiss NSF [PP002-102831]
- Carlsberg Foundation
- State of Florida
- DOE
- Grants-in-Aid for Scientific Research [19740218, 22014014, 21110522] Funding Source: KAKEN
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We study the magnetic-field-induced quantum phase transition from a gapped quantum phase that has no magnetic long-range order into a gapless phase in the spin-1/2 ladder compound bis(2,3-dimethylpyridinium) tetrabromocuprate (DIMPY). At temperatures below about 1 K, the specific heat in the gapless phase attains an asymptotic linear temperature dependence, characteristic of a Tomonaga-Luttinger liquid. Inelastic neutron scattering and the specific heat measurements in both phases are in good agreement with theoretical calculations, demonstrating that DIMPY is the first model material for an S = 1/2 two-leg spin ladder in the strong-leg regime.
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