Spin Dynamics in the Model Spin-ladder Compound (C5H12N)2CuBr4 Probed with ESR


Spin Dynamics in the Model Spin-ladder Compound (C5H12N)2CuBr4 Probed with ESR

Zvyagin, S.

In first part of my presentation I will talk about recent development of the high-fi eld electron spin resonance (ESR) facility at the Dresden High Magnetic Field Laboratory. The unique feature of the facility is a combination of the free electron laser (1.2 – 75 THz) and pulsed (up to 65 T) magnetic fields. In the low-frequency range the FEL facility is complemented by conventional radiation sources allowing for ESR experiments down to 30 GHz. In second part of my talk I will present results of ESR studies of the spin-ladder compound (C5H12N)2CuBr4 (known as BPCB). Angular, temperature dependences, as well as the frequency-fi eld diagram of magnetic excitations have been studied in detail. The energy gap in center of the Brillouin zone (16.46 K), was observed directly, confirming the presence of the Dzyaloshinskii-Moriya interaction. A small (~140 mK) splitting between the gapped modes can be accounted by a weak interladder coupling. In addition, the temperature evolution of the ESR excitation spectrum revealed a highly unusual behavior, whose peculiarities are discussed.

  • Invited lecture (Conferences)
    RHMF09 (Research on High Magnetic Fields 2009), 22.-25.07.2009, Dresden, Deutschland

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Publ.-Id: 13057