Journal
PHYSICAL REVIEW LETTERS
Volume 117, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.117.106402
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Funding
- European Commission contract EuroMagnet II [228043]
- French ANR project BOLODISS
- Swiss National Science Foundation, Division II
- European Commission through Marie Sklodowska-Curie Action COFUND
- European Research Council grant CONQUEST
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We present a direct NMR method to determine whether the interactions in a Tomonaga-Luttinger liquid (TLL) state of a spin-1/2 Heisenberg antiferromagnetic ladder are attractive or repulsive. For the strong-leg spin ladder compound (C7H10N)(2) CuBr4 we find that the isothermal magnetic field dependence of the NMR relaxation rate T-1(-1) (H) displays a concave curve between the two critical fields bounding the TLL regime. This is in sharp contrast to the convex curve previously reported for a strong-rung ladder, (C5H12N)(2) CuBr4. We show that the concavity and the convexity of T-1(-1)(H), which is a fingerprint of spin fluctuations, directly reflect the attractive and repulsive fermionic interactions in the TLL, respectively. The interaction sign is alternatively determined from an indirect method combining bulk magnetization and specific heat data.
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