Magnetic order in lightly doped La2-xSrxCuO4.
نویسندگان
چکیده
We study long wavelength magnetic excitations in lightly doped La2-xSrxCuO4 (x</=0.03) detwinned crystals. The lowest energy magnetic anisotropy induced gap can be understood in terms of the antisymmetric spin interaction inside the antiferromagnetic (AF) phase. The second magnetic resonance, analyzed in terms of in-plane spin anisotropy, shows unconventional behavior within the AF state; it led to the discovery of collective spin excitations pertaining to a field induced magnetically ordered state. This state persists in a 9 T field to more than 100 K above the Néel temperature in x=0.01.
منابع مشابه
Freezing of stripes in lightly-doped La2−xSrxCuO4 as manifested in magnetic and transport properties of untwinned single crystals
Resistivity and magnetization measurements are used for studying the transverse sliding of AF domain boundaries in lightly doped La2−xSrxCuO4. We discuss that it is the freezing of the transverse boundary motion that is responsible for the appearance of “spin-glass” features at low temperatures.
متن کاملSpin reorientation and in-plane magnetoresistance of lightly doped La2−xSrxCuO4 in magnetic fields up to 55 T
The magnetoresistance (MR) in the in-plane resistivity is measured in magnetic fields up to 55 T in lightly doped La2−xSrxCuO4 in the Néel state (x = 0.01) and in the spin-glass state (x = 0.03) using high-quality untwinned single crystals. In both cases, a large negative MR is observed to appear when the magnetic order is established. For x = 0.01, it is found that the MR is indicative of a on...
متن کاملAnisotropic electromagnetic response of lightly doped La2-xSrxCuO4 within the CuO2 planes.
Using infrared spectroscopy, we show that spin self-organization in untwinned La2-xSrxCuO4 (LSCO) crystals has profound consequences for the dynamical conductivity sigma(omega). The electronic response of CuO2 planes acquires significant anisotropy in the spin ordered state with enhancement of the conductivity along the direction of the diagonal spin stripes by up to a factor of 2. An examinati...
متن کاملDoping evolution of the electronic specific heat coefficient in slightly-doped La2−xSrxCuO4 single crystals
Detailed doping dependence of the electronic specific heat coefficient γ is studied for La2−xSrxCuO4 (LSCO) single crystals in the slightly-doped regime. We find that γ systematically increases with doping, and furthermore, even for the samples in the antiferromagnetic (AF) regime, γ already acquires finite value and grows with x. This suggests that finite electronic density of states (DOS) is ...
متن کاملDelocalized fermions in underdoped cuprate superconductors.
Low-temperature heat transport was used to investigate the ground state of high-purity single crystals of the lightly doped cuprate YBa2Cu3O6.33. Samples were measured with doping concentrations on either side of the superconducting phase boundary. We report the observation of delocalized fermionic excitations at zero energy in the nonsuperconducting state, which shows that the ground state of ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Physical review letters
دوره 93 2 شماره
صفحات -
تاریخ انتشار 2004