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Magnetic anisotropy and low-frequency dielectric response of weak ferromagnetic phase in kappa-(BEDT-TTF)_2-Cu[N(CN)_2]Cl, where BEDT-TTF is Bis(ethylenedithio)tetrathiafulvalene (CROSBI ID 87550)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Pinterić, Marko ; Miljak, Marko ; Biškup, Nevenko ; Milat, Ognjen ; Aviani, Ivica ; Tomić, Silvia ; Schweitzer, Dieter ; Strunz, W. ; Heinen, I. Magnetic anisotropy and low-frequency dielectric response of weak ferromagnetic phase in kappa-(BEDT-TTF)_2-Cu[N(CN)_2]Cl, where BEDT-TTF is Bis(ethylenedithio)tetrathiafulvalene // European physical journal B : condensed matter physics, 11 (1999), 2; 217-225. doi: 10.1007/BF03219166

Podaci o odgovornosti

Pinterić, Marko ; Miljak, Marko ; Biškup, Nevenko ; Milat, Ognjen ; Aviani, Ivica ; Tomić, Silvia ; Schweitzer, Dieter ; Strunz, W. ; Heinen, I.

engleski

Magnetic anisotropy and low-frequency dielectric response of weak ferromagnetic phase in kappa-(BEDT-TTF)_2-Cu[N(CN)_2]Cl, where BEDT-TTF is Bis(ethylenedithio)tetrathiafulvalene

We report a detailed characterization of the magnetism and AC transport in single crystals of the organic conductor kappa-(BEDT-TTF)_2-Cu[N(CN)_2]Cl by means of magnetic anisotropy measurements and low-frequency dielectric spectroscopy. Magnetic anisotropy obeys Curie-Weiss law with negative Curie-Weiss temperature in the temperature range 300 K - 70 K. An antiferromagnetic transition with concomitant canted antiferromagnetic state is established at 22 K. A large hysteresis in the spin-flop transition and magnetic field reversal of the weak ferromagnetic magnetization are documented for the first time. A broad dielectric relaxation mode of moderate strength(\Delta\epsilon~3 10^3) emerges at 32 K, and weakens with temperature. The mean relaxation time, much larger than that expected for single-particle excitations, is thermally activated in a manner similar to the DC conductivity and saturates below 22 K. These features suggest the origin of the broad relaxation as an intrinsic property of the weak ferromagnetic ground state. We propose a charged domain wall in a random ferromagnetic domain structure as the relaxation entity. We argue that the observed features might be well described if Dzyaloshinsky-Moriya interaction is taken into account. A Debye relaxation with similar temperature dependence was also observed and seems to be related to an additional ferromagnetic-like, most probably, field-induced phase. We tentatively associate this phase, whose tiny contribution was sample dependent, with a Cu^{;2+}; magnetic subsystem.

organic superconductors; collective modes; magnetic anisotropy

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Podaci o izdanju

11 (2)

1999.

217-225

objavljeno

1434-6028

10.1007/BF03219166

Povezanost rada

Fizika

Poveznice
Indeksiranost