Magnetoresistivity and Monte Carlo studies of magnetic phase transitions in C6Eu.
Magnetoresistivity and Monte Carlo studies of magnetic phase transitions in C6Eu.
复制标题
C6Eu 中磁相变的磁阻和蒙特卡罗研究。
DOI：
--
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
Yosida
中科院分区：
文献类型：
--
作者：
Chen;Dresselhaus;Suematsu;Minemoto;Ohmatsu;Yosida
The high-field magnetoresistivity ensuremath{
ho}(H) of the antiferromagnetic first-stage graphite intercalation compound ${mathrm{C}}_{6}$Eu has been measured with Hensuremath{perp}c^ and Hensuremath{parallel}c^. Both the longitudinal (Jensuremath{parallel}H) magnetoresistivity ${ensuremath{
ho}}_{l}$(${H}_{ensuremath{perp}}$) and the transverse (Jensuremath{perp}H) magnetoresistivity ${ensuremath{
ho}}_{t}$(${H}_{ensuremath{perp}}$) with Hensuremath{perp}c^ show distinct changes across the magnetic phase boundaries which occur at fields of 1.5, 8, 15, and 21.5 T at a temperature T=4.2 K. The phase transition at H=15 T was not observed previously by the pulsed magnetization measurements. A Monte Carlo simulation based on the Hamiltonian of Sakakibara and Date was carried out for the ${mathrm{C}}_{6}$Eu system. The 15-T phase transition is explained as a transition from a ``canted' to a ``fan' state. The transverse magnetoresistivity ${ensuremath{
ho}}_{t}$(${H}_{?}$) with H?c^ shows a clear anomaly at the field corresponding to the onset of the transition to the spin-aligned paramagnetic state. A magnetic phase diagram has been accurately determined based on the results of the magnetoresistivity measurements. The various spin configurations in the phase diagram are identified and the parameters of the Hamiltonian are determined using the results of the Monte Carlo simulation.
The high-field magnetoresistivity ensuremath{
ho}(H) of the antiferromagnetic first-stage graphite intercalation compound ${mathrm{C}}_{6}$Eu has been measured with Hensuremath{perp}c^ and Hensuremath{parallel}c^. Both the longitudinal (Jensuremath{parallel}H) magnetoresistivity ${ensuremath{
ho}}_{l}$(${H}_{ensuremath{perp}}$) and the transverse (Jensuremath{perp}H) magnetoresistivity ${ensuremath{
ho}}_{t}$(${H}_{ensuremath{perp}}$) with Hensuremath{perp}c^ show distinct changes across the magnetic phase boundaries which occur at fields of 1.5, 8, 15, and 21.5 T at a temperature T=4.2 K. The phase transition at H=15 T was not observed previously by the pulsed magnetization measurements. A Monte Carlo simulation based on the Hamiltonian of Sakakibara and Date was carried out for the ${mathrm{C}}_{6}$Eu system. The 15-T phase transition is explained as a transition from a ``canted' to a ``fan' state. The transverse magnetoresistivity ${ensuremath{
ho}}_{t}$(${H}_{?}$) with H?c^ shows a clear anomaly at the field corresponding to the onset of the transition to the spin-aligned paramagnetic state. A magnetic phase diagram has been accurately determined based on the results of the magnetoresistivity measurements. The various spin configurations in the phase diagram are identified and the parameters of the Hamiltonian are determined using the results of the Monte Carlo simulation.