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首页> 外文期刊>Solid State Communications >Possible anisotropy gap in La1.35Sr1.65Mn2O7 and La1.5Sr0.5NiO4 detected through specific heat and magnetization measurements
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Possible anisotropy gap in La1.35Sr1.65Mn2O7 and La1.5Sr0.5NiO4 detected through specific heat and magnetization measurements

机译：通过比热和磁化测量发现La1.35Sr1.65Mn2O7和La1.5Sr0.5NiO4中可能存在各向异性间隙

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摘要

Magnetization and specific heat measurements, as a function of temperature, were performed on single crystals of La1.35Sr1.65Mn2O7 and La1.5Sr0.5NiO4, under different applied magnetic fields (H). The specific heat in La1.35Sr1.65Mn2O7 was decreased for H = 9 T parallel to the crystal c axis, compared with H = 0, possibly due to a suppression of spin-wave excitations (magnons) in that ferromagnetic bilayer structure. On the other hand, the applied magnetic field had no effect in the specific heat of the antiferromagnetic La1.5Sr0.5NiO4. For H = 9 T and below the temperature of 4 K the specific heat data, for each crystal, was well fitted by an exponential decay law. This allowed the calculation of energy gaps around I meV for both compounds, in close agreement with Delta = 2 mu H-B for an expected energy gap in the magnon spectrum. Detailed magnetization measurements showed monotonic variations below 4 K and a steep increase close to 2 K. Both magnetization and specific heat measurements suggest the existence of an anisotropy gap in the energy spectrum of La1.35Sr1.65Mn2O7 and La1.5Sr0.5NiO4. (c) 2006 Elsevier Ltd. All rights reserved.
机译：在不同的施加磁场（H）下，对La1.35Sr1.65Mn2O7和La1.5Sr0.5NiO4单晶进行磁化和比热测量，作为温度的函数。与H = 0相比，平行于晶体c轴的H = 9 T时，La1.35Sr1.65Mn2O7中的比热降低了，这可能是因为该铁磁双层结构中的自旋波激发（磁振子）受到抑制。另一方面，施加的磁场对反铁磁La1.5Sr0.5NiO4的比热没有影响。对于H = 9 T且低于4 K的温度，每个晶体的比热数据均符合指数衰减定律。这样就可以计算出两种化合物在I meV附近的能隙，与在磁能谱中的预期能隙的Delta = 2μH-B密切相关。详细的磁化强度测量结果显示，单调变化低于4 K，并且急剧增加，接近2K。磁化强度和比热测量均表明La1.35Sr1.65Mn2O7和La1.5Sr0.5NiO4的能谱中存在各向异性间隙。 （c）2006 Elsevier Ltd.保留所有权利。

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