We report 63Cu nuclear magnetic resonance and muon spin rotation measurements on the S = 1/2 antiferromagnetic Heisenberg spin chain compound Sr1.9Ca0.1CuO3. An exponentially decreasing spin-lattice relaxation rate T −1 1 indicates the opening of a spin gap. This behavior is very similar to what has been observed for the cognate zigzag spin chain compound Sr0.9Ca0.1CuO2, and it confirms that the occurrence of a spin gap upon Ca doping is independent of the interchain exchange coupling J . Our results therefore suggest that the appearance of a spin gap in an antiferromagnetic Heisenberg spin chain is induced by a local bond disorder of the intrachain exchange coupling J . A low-temperature upturn of T −1 1 evidences growing magnetic correlations. However, zero-field muon spin rotation measurements down to 1.5 K confirm the absence of magnetic order in this compound, which is most likely suppressed by the opening of the spin gap.

Hammerath, F., Brüning, E.M., Sanna, S., Utz, Y., Beesetty, N.S., Saint Martin, R., et al. (2014). Spin gap in the single spin- 12 chain cuprate Sr1.9 Ca0.1 CuO3. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 89(18), 1-5 [10.1103/PhysRevB.89.184410].

Spin gap in the single spin- 12 chain cuprate Sr1.9 Ca0.1 CuO3

SANNA, SAMUELE;
2014

Abstract

We report 63Cu nuclear magnetic resonance and muon spin rotation measurements on the S = 1/2 antiferromagnetic Heisenberg spin chain compound Sr1.9Ca0.1CuO3. An exponentially decreasing spin-lattice relaxation rate T −1 1 indicates the opening of a spin gap. This behavior is very similar to what has been observed for the cognate zigzag spin chain compound Sr0.9Ca0.1CuO2, and it confirms that the occurrence of a spin gap upon Ca doping is independent of the interchain exchange coupling J . Our results therefore suggest that the appearance of a spin gap in an antiferromagnetic Heisenberg spin chain is induced by a local bond disorder of the intrachain exchange coupling J . A low-temperature upturn of T −1 1 evidences growing magnetic correlations. However, zero-field muon spin rotation measurements down to 1.5 K confirm the absence of magnetic order in this compound, which is most likely suppressed by the opening of the spin gap.
2014
Hammerath, F., Brüning, E.M., Sanna, S., Utz, Y., Beesetty, N.S., Saint Martin, R., et al. (2014). Spin gap in the single spin- 12 chain cuprate Sr1.9 Ca0.1 CuO3. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 89(18), 1-5 [10.1103/PhysRevB.89.184410].
Hammerath, F.; Brüning, E. M.; Sanna, Samuele; Utz, Y.; Beesetty, N. S.; Saint Martin, R.; Revcolevschi, A.; Hess, C.; Büchner, B.; Grafe, H. J....espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/549479
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