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25 April 2024 |
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The quantum spin magnet CaCu$_2$O$_3$ probed by high-field ESR | | M. Goiran
; M. Costes
; J.M. Broto
; F.C. Chou
; E. Arushanov
; S.-L. Drechsler
; B. Büchner
; V. Kataev
; | | Date: |
26 Dec 2004 | | Subject: | Superconductivity | cond-mat.supr-con | | Abstract: | We report an electron spin resonance (ESR) study of the s=1/2-Heisenberg pseudo-ladder magnet CaCu$_2$O$_3$ in pulsed magnetic fields up to 40 T. At sub-Terahertz frequencies we observe an ESR signal originating from a small amount of uncompensated spins residing presumably at the imperfections of the strongly antiferromagnetically correlated host spin lattice. The data give evidence that these few percent of extra spin states are coupled strongly to the bulk spins and are involved in the antiferromagnetic ordering at T_N=25 K. By mapping the frequency/resonance field diagram we have determined a small spin gap for magnetic excitations below T_N of the order of ~ 0.3 meV. Such a small value of the gap explains the occurrence of the spin-flop transition in CaCu$_2$O$_3$ at weak magnetic fields H_{sf}~3 T. Qualitative changes of the ESR response with increasing the field strength give indications that strong magnetic fields reduce antiferromagnetic fluctuations and may even suppress the long-range magnetic order in CaCu$_2$O$_3$. ESR data support predicted scenarios with a significant role of the extra spin states for the properties of low-dimensional quantum magnets. | | Source: | arXiv, cond-mat/0501647 | | Services: | Forum | Review | PDF | Favorites | |
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