Muon study of molecular magnets, spin crossover and magnetic nanodiscs
SYNTHETIC MET 133 (2003) 531-533
Abstract:
We present the results of recent muon-spin rotation (muSR) experiments on a variety of novel molecular magnetic systems. Muons are sensitive to local static fields and magnetic fluctuations, but can probe much more than just the onset of long-range magnetic order. The spin-crossover phenomenon has been studied in Fe(PM-PEA)(2)(NCS)(2), which shows Gaussian and root-exponential muon relaxation in the high-spin and low-spin phases, respectively. Dy spin fluctuations have been studied with muSR in the ferrimagnetic chain Dy(hfac)(3)(NITEt). Experiments on a disc-shaped molecular complex containing Fe-19 (with spin 31/2) reveal the effects of quantum tunneling of magnetization and allow an estimate of the quantum tunneling rate. (C) 2002 Elsevier Science B.V. All rights reserved.Studies of the magnetoresistive peak due to interlayer coherence in a quasi-two-dimensional superconductor
SYNTHETIC MET 133 (2003) 173-175
Abstract:
Peaks in the interlayer magnetoresistance of the layered superconductor kappa-(BEDT-TTF)(2)Cu(NCS)(2) are observed in the presence of an exactly in-plane magnetic field. The existence of these resistance peaks implies the presence of a three-dimensional Fermi surface extending in the interlayer region. Analysis of the width of the peaks yields a value for the interlayer transfer integral. (C) 2002 Elsevier Science B.V. All rights reserved.mu SR studies of the interaction between magnetism and superconductivity in kappa-BETS2FeCl4
SYNTHETIC MET 133 (2003) 489-492
Abstract:
Zero field (ZF) muon spin relaxation measurements on the organic metal kappa-BETS2FeCl4 clearly show the formation of an antiferromagnetically ordered state below T-N = 0.45 K. The magnetic order remains unperturbed on cooling through the superconducting transition T-c similar to0.17 K, providing unambiguous evidence for the coexistence of antiferromagnetic order and superconductivity in this system. Detailed studies of the internal field distribution show contrasting behavior for different muon sites and provide experimental evidence for an ordered spin structure in the BETS layers in addition to that taking place in the Fe layers. (C) 2002 Elsevier Science B.V. All rights reserved.μSR studies of the interaction between magnetism and superconductivity in κ-BETS2 FeCl4
Synthetic Metals 133-134 (2003) 489-492
Abstract:
Zero field (ZF) muon spin relaxation measurements on the organic metal κ-BETS2FeCl4 clearly show the formation of an antiferromagnetically ordered state below TN = 0.45 K. The magnetic order remains unperturbed on cooling through the superconducting transition Tc ∼0.17 K, providing unambiguous evidence for the coexistence of antiferromagnetic order and superconductivity in this system. Detailed studies of the internal field distribution show contrasting behavior for different muon sites and provide experimental evidence for an ordered spin structure in the BETS layers in addition to that taking place in the Fe layers. © 2002 Elsevier Science B.V. All rights reserved.Angle-dependent vortex structure in a high anisotropy superconductor
Physica B: Condensed Matter 326:1-4 (2003) 374-377