2 1 N ov 1 99 6 Spin glass behavior in URh
نویسندگان
چکیده
URh 2 Ge 2 occupies an extraordinary position among the heavy–electron 122– compounds, by exhibiting a previously unidentified form of magnetic correlations at low temperatures, instead of the usual antiferromagnetism. Here we present new results of ac and dc susceptibilities, specific heat and neutron diffraction on single–crystalline as–grown URh 2 Ge 2. These data clearly indicate that crystallographic disorder on a local scale produces spin glass behavior in the sample. We therefore conclude that URh 2 Ge 2 is a 3D Ising–like, random–bond, heavy–fermion spin glass.
منابع مشابه
N ov 1 99 4 RANDOM FRUSTRATION IN TWO - DIMENSIONAL SPIN - 1 / 2 HEISENBERG ANTIFERROMAGNET
The square lattice spin-1/2 antiferromagnet containing a dilute concentration, δ, of randomly placed ferromagnetic nearest-neighbor bonds is studied at low-temperature via nonlinear σ-model techniques and by exact diagonalization. We generally find that long-range Néel order is destroyed above a critical strength in the defective ferromagnetic exchange coupling-constant given by |Kc|/J ∼ δ . We...
متن کاملN ov 1 99 8 Microwave surface impedance of proximity - coupled superconducting ( Nb ) / spin - glass ( CuMn ) bilayers
The surface impedance of Nb/CuMn (superconducting/spin-glass) bilayers has been measured at 10 GHz with the parallel plate resonator technique to obtain information about the exotic behavior of the order parameter in superconducting/magnetic proximity systems. The data strongly differs from the superconducting/normal-metal case, showing the magnetic nature of the CuMn layer, which acts as a wea...
متن کامل1 N ov 1 99 6 Spin stiffness in the frustrated Heisenberg antiferromagnet
We calculate the spin stiffness of the S = 1 2 frustrated Heisenberg antiferro-magnet directly from a general formula which is evaluated in the Schwinger boson mean-field approximation. Both Néel and collinear ordering are considered. For collinear ordering, we take the anisotropy of this phase into account, unlike previous approaches. For Néel ordering, a detailed study is made of the finite-s...
متن کامل2 1 N ov 1 99 6 Sr impurity effects on the magnetic correlations of La 2 − x Sr x CuO 4
We examine the low–temperature magnetic properties of moderately doped La2−xSrxCuO4, paying particular attention to the spin–glass phase and the commensurate–incommensurate transition as they are affected by Sr impurity disorder. A model of the carriers, believed to be appropriate at low temperatures, is employed in the CuO2 planes that accounts for both the strong coupling of the hole’s motion...
متن کامل