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Electronic specific heat and low-energy quasiparticle excitations in the superconducting state of La2-xSrxCuO4 single crystals
Wen, HH; Liu, ZY; Zhou, F; Xiong, JW; Ti, WX; Xiang, T; Komiya, S; Sun, XF; Ando, Y; Wen, HH , Chinese Acad Sci, Inst Phys, Natl Lab Superconduct, POB 603, Beijing 100080, Peoples R China.
2004
发表期刊PHYSICAL REVIEW B
ISSN1098-0121
卷号70期号:21页码:-
摘要Low-temperature specific heat has been measured and extensively analyzed on a series of La2-xSrxCuO4 single crystals from underdoped to overdoped regime. From these data the quasiparticle density of state in the mixed state is derived and compared to the predicted scaling law C-vol/TrootH=f(T/rootH) of d-wave superconductivity. It is found that the scaling law can be nicely followed by the optimally doped sample (x = 0.15) in quite a wide region of (T/rootH less than or equal to 8K/rootT). However, the region for this scaling becomes smaller and smaller toward more underdoped region: a clear trend can be seen for samples from x=0.15 to 0.069. Therefore, generally speaking, the scaling quality becomes worse on the underdoped samples in terms of scalable region of T/rootH. This feature in the underdoped region is explained as due to the low-energy excitations from a second order ( for example, antiferromagnetic correlation, d-density wave, spin-density wave, or charge-density wave order) that may coexist or compete with superconductivity. Surprisingly, deviations from the d-wave scaling law have also been found for the overdoped sample (x=0.22), while the scaling law is reconciled for the overdoped sample, when the core size effect is taken into account. An important discovery of present work is that the zero-temperature data follow the Volovik's relation Deltagamma(T=0)=ArootH quite well for all samples investigated here; although the applicability of the d-wave scaling law to the data at finite temperatures varies with doped-hole concentration. We also present the doping dependence of some parameters, such as the residual linear term gamma(0), the alpha value, etc. It is suggested that the residual linear term (gamma(0)T) of the electronic specific heat observed in all cuprate superconductors is probably due to the inhomogeneity, either chemical or electronic in origin. The field-induced reduction of the specific heat in the mixed state is also reported. Finally, implications on the electronic phase diagram are suggested.
部门归属Chinese Acad Sci, Inst Phys, Natl Lab Superconduct, Beijing 100080, Peoples R China; Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; Chinese Acad Sci, ICTS, Beijing 100080, Peoples R China; Cent Res Inst Elect Power Ind, Tokyo 2018511, Japan
关键词D-wave Superconductors Density-of-states High-temperature Superconductor Upper-critical-field T-c Superconductors Vortex Cores Cuprate Superconductors Magnetic-field Antiferromagnetic Order bi2sr2cacu2o8+delta
学科领域Physics
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收录类别SCI
WOS记录号WOS:000226111400106
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被引频次:37[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/13955
专题理论物理所1978-2010年知识产出
通讯作者Wen, HH , Chinese Acad Sci, Inst Phys, Natl Lab Superconduct, POB 603, Beijing 100080, Peoples R China.
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Wen, HH,Liu, ZY,Zhou, F,et al. Electronic specific heat and low-energy quasiparticle excitations in the superconducting state of La2-xSrxCuO4 single crystals[J]. PHYSICAL REVIEW B,2004,70(21):-.
APA Wen, HH.,Liu, ZY.,Zhou, F.,Xiong, JW.,Ti, WX.,...&Wen, HH , Chinese Acad Sci, Inst Phys, Natl Lab Superconduct, POB 603, Beijing 100080, Peoples R China..(2004).Electronic specific heat and low-energy quasiparticle excitations in the superconducting state of La2-xSrxCuO4 single crystals.PHYSICAL REVIEW B,70(21),-.
MLA Wen, HH,et al."Electronic specific heat and low-energy quasiparticle excitations in the superconducting state of La2-xSrxCuO4 single crystals".PHYSICAL REVIEW B 70.21(2004):-.
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