Anisotropic electrical resistivity of the magnetic heavy-fermion superconductor URu2Si2.

Anisotropic electrical resistivity of the magnetic heavy-fermion superconductor URu2Si2.
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磁性重费米子超导体 URu2Si2 的各向异性电阻率。

DOI:
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发表时间:
1986
期刊:
Physical Review B (Condensed Matter)
影响因子:
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通讯作者:
Mydosh
Mydosh
中科院分区:
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文献类型:
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作者:
Palstra;Menovsky;Mydosh

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在0.3~300K温度范围内,在高达7T的磁场下,对单晶URu/sub 2/Si/sub 2/进行了电阻率ρ(T,H)测量。rho(T)是高度各向异性的,平行于a和c轴的300-K值相差2倍。两个方向在低至80 K时都表现出drho/dT <0,随后在低于50 K时rho急剧下降。在大约等于17 K的温度下,通过"类铬"异常可以清楚地看出上反铁磁转变,这也标志着强的正ρ(H)的开始。在4K以下,ρ(T)是各向同性的,在超导转变T/sub c/= 0.8K时趋于零。
Electrical-resistivity measurements rho(T,H) on single-crystal URu/sub 2/Si/sub 2/ have been performed between 0.3 and 300 K in fields up to 7 T. rho(T) is highly anisotropic with the 300-K values parallel to the a and c axes differing by a factor of 2. Both directions exhibit a drho/dT<0 down to 80 K, followed by a steep decrease in rho below 50 K. An upper antiferromagnetic transition is clearly discerned by a 'Cr-like' anomaly at roughly-equal17 K which also marks the onset of a strong, positive rho(H). Below 4 K rho(T) is isotropic and goes to zero at the superconducting transition T/sub c/ = 0.8 K.