Metallization and 250 K anomaly of HgBr2-intercalated Bi-2212 single crystals

Gyu Tae Kim; Jae Hoon Lee; Yung Woo Park; Jin Ho Choy; Seong Ju Hwang

doi:10.1088/0953-2048/11/1/026

Metallization and 250 K anomaly of HgBr₂-intercalated Bi-2212 single crystals

Gyu Tae Kim, Jae Hoon Lee, Yung Woo Park, Jin Ho Choy, Seong Ju Hwang

Research output: Contribution to journal › Article › peer-review

Abstract

The anisotropic resistivity (p_ab(T) and p_c(T)) and thermoelectric power (S_ab(T) and S_c(T)) of HgBr₂-intercalated Bi-2212 single crystals are measured. In the normal state (T > T_c), the semiconductor-like behaviour of p_c(T) of the pristine Bi₂Sr₂CaCu₂O_y becomes metallic upon HgBr₂ intercalation, while p_ab(T) remains metallic. Unlike the iodine-intercalated Bi-2212, the semiconductor-like S_ab(T) of the pristine sample changes to be weakly temperature dependent upon HgBr₂ intercalation and yet the S_C(T) remains temperature independent. Resistivity and thermoelectric power data of the HgBr₂-intercalated samples show anomalies at T = 250 K reminiscent of a phase transition. The results indicate that the charge transfer from HgBr₂ to the CuO₂ plane is important, which supports the picture that the doping-induced holes in the copper oxide sheets are responsible for the high-temperature superconductivity.

Original language	English
Pages (from-to)	133-137
Number of pages	5
Journal	Superconductor Science and Technology
Volume	11
Issue number	1
DOIs	https://doi.org/10.1088/0953-2048/11/1/026
Publication status	Published - 1998 Jan
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics
Ceramics and Composites
Metals and Alloys
Materials Chemistry
Electrical and Electronic Engineering

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10.1088/0953-2048/11/1/026

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title = "Metallization and 250 K anomaly of HgBr2-intercalated Bi-2212 single crystals",

abstract = "The anisotropic resistivity (pab(T) and pc(T)) and thermoelectric power (Sab(T) and Sc(T)) of HgBr2-intercalated Bi-2212 single crystals are measured. In the normal state (T > Tc), the semiconductor-like behaviour of pc(T) of the pristine Bi2Sr2CaCu2Oy becomes metallic upon HgBr2 intercalation, while pab(T) remains metallic. Unlike the iodine-intercalated Bi-2212, the semiconductor-like Sab(T) of the pristine sample changes to be weakly temperature dependent upon HgBr2 intercalation and yet the SC(T) remains temperature independent. Resistivity and thermoelectric power data of the HgBr2-intercalated samples show anomalies at T = 250 K reminiscent of a phase transition. The results indicate that the charge transfer from HgBr2 to the CuO2 plane is important, which supports the picture that the doping-induced holes in the copper oxide sheets are responsible for the high-temperature superconductivity.",

author = "Kim, {Gyu Tae} and Lee, {Jae Hoon} and Park, {Yung Woo} and Choy, {Jin Ho} and Hwang, {Seong Ju}",

year = "1998",

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doi = "10.1088/0953-2048/11/1/026",

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AU - Kim, Gyu Tae

AU - Lee, Jae Hoon

AU - Park, Yung Woo

AU - Choy, Jin Ho

AU - Hwang, Seong Ju

PY - 1998/1

Y1 - 1998/1

N2 - The anisotropic resistivity (pab(T) and pc(T)) and thermoelectric power (Sab(T) and Sc(T)) of HgBr2-intercalated Bi-2212 single crystals are measured. In the normal state (T > Tc), the semiconductor-like behaviour of pc(T) of the pristine Bi2Sr2CaCu2Oy becomes metallic upon HgBr2 intercalation, while pab(T) remains metallic. Unlike the iodine-intercalated Bi-2212, the semiconductor-like Sab(T) of the pristine sample changes to be weakly temperature dependent upon HgBr2 intercalation and yet the SC(T) remains temperature independent. Resistivity and thermoelectric power data of the HgBr2-intercalated samples show anomalies at T = 250 K reminiscent of a phase transition. The results indicate that the charge transfer from HgBr2 to the CuO2 plane is important, which supports the picture that the doping-induced holes in the copper oxide sheets are responsible for the high-temperature superconductivity.

AB - The anisotropic resistivity (pab(T) and pc(T)) and thermoelectric power (Sab(T) and Sc(T)) of HgBr2-intercalated Bi-2212 single crystals are measured. In the normal state (T > Tc), the semiconductor-like behaviour of pc(T) of the pristine Bi2Sr2CaCu2Oy becomes metallic upon HgBr2 intercalation, while pab(T) remains metallic. Unlike the iodine-intercalated Bi-2212, the semiconductor-like Sab(T) of the pristine sample changes to be weakly temperature dependent upon HgBr2 intercalation and yet the SC(T) remains temperature independent. Resistivity and thermoelectric power data of the HgBr2-intercalated samples show anomalies at T = 250 K reminiscent of a phase transition. The results indicate that the charge transfer from HgBr2 to the CuO2 plane is important, which supports the picture that the doping-induced holes in the copper oxide sheets are responsible for the high-temperature superconductivity.

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Metallization and 250 K anomaly of HgBr₂-intercalated Bi-2212 single crystals

Abstract

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