Publication

Magnetic-Order Crossover in Coupled Spin Ladders

2017
Journal Articles

Abstract

We report a novel crossover behavior in the long-range-ordered phase of a prototypical spin-1/2 Heisenberg antiferromagnetic ladder compound (C7H10N)(2)CuBr4. The staggered order was previously evidenced from a continuous and symmetric splitting of (NNMR)-N-14 spectral lines on lowering the temperature below Tc similar or equal to 330 mK, with a saturation towards. 150 mK. Unexpectedly, the split lines begin to further separate away below T* similar to 100mK, while the linewidth and the line shape remain completely invariable. This crossover behavior is further corroborated by the NMR relaxation rate T-1(-1) measurements. A very strong suppression reflecting the ordering, T-1(-1)similar to T-5.5, observed above T*, is replaced by T-1(-1) similar to T below T*. These original NMR features are indicative of the unconventional nature of the crossover, which may arise from a unique arrangement of the ladders into a spatially anisotropic and frustrated coupling network.

Official source

https://infoscience.epfl.ch/entities/publication/ef0daebd-0ceb-42aa-8b92-248c6181aa6b

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2017
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/ef0daebd-0ceb-42aa-8b92-248c6181aa6b

About this result

Related concepts (31)

Spin–lattice relaxation

During nuclear magnetic resonance observations, spin–lattice relaxation is the mechanism by which the longitudinal component of the total nuclear magnetic moment vector (parallel to the constant magnetic field) exponentially relaxes from a higher energy, non-equilibrium state to thermodynamic equilibrium with its surroundings (the "lattice"). It is characterized by the spin–lattice relaxation time, a time constant known as T1.

Spin–spin relaxation

In physics, the spin–spin relaxation is the mechanism by which Mxy, the transverse component of the magnetization vector, exponentially decays towards its equilibrium value in nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI). It is characterized by the spin–spin relaxation time, known as T2, a time constant characterizing the signal decay. It is named in contrast to T1, the spin–lattice relaxation time.

Nuclear magnetic resonance

Nuclear magnetic resonance (NMR) is a physical phenomenon in which nuclei in a strong constant magnetic field are perturbed by a weak oscillating magnetic field (in the near field) and respond by producing an electromagnetic signal with a frequency characteristic of the magnetic field at the nucleus. This process occurs near resonance, when the oscillation frequency matches the intrinsic frequency of the nuclei, which depends on the strength of the static magnetic field, the chemical environment, and the magnetic properties of the isotope involved; in practical applications with static magnetic fields up to ca.

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Magnetic-Order Crossover in Coupled Spin Ladders

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