Evolution of superconducting transition temperature (T-c) upon intercalation of HgBr2 into the Bi2Sr1.5-xLaxCa1.5Cu2Oy

被引:18
作者
Choy, JH [1 ]
Park, NG [1 ]
Hwang, SJ [1 ]
Khim, ZG [1 ]
机构
[1] SEOUL NATL UNIV,COLL NAT SCI,DEPT PHYS,SEOUL 151742,SOUTH KOREA
关键词
D O I
10.1021/jp952748n
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Intercalation of HgBr2 into Bi2Sr1.5-xLaxCa1.5Cu2Oy (0.0 less than or equal to y less than or equal to 0.4) superconductor has been carried out in order to elucidate the origin of T-c evolution upon intercalation. The T-c's obtained from the de magnetic susceptibility measurements were plotted against x. The plot of T-c vs x for the pristines showed the parabolic feature with overdoped (0.0 less than or equal to x less than or equal to 0.1), optimally doped (x = 0.1), and underdoped (0.2 less than or equal to x less than or equal to 0.4) regions. The T-c's of the HgBr2 intercalates in the overdoped region were reduced less than similar to 6 K but increased by 4-6 K in the underdoped one compared with nonintercalated samples. Such changes in T-c upon intercalation indicate hole doping from intercalant to host lattice. An attempt of semiempirical calculation was made to determine the hole concentration doped by intercalation. Upon HgBr2 intercalation, the amount of hole doping was estimated to be similar to 0.2 hole per formula unit of the sample with x = 0.0, whereas the doping of similar to 0.3 hole was estimated for the iodine intercalated sample. Considering the T-c depression (Delta T-c) and lattice expansion (Delta d) between the iodine intercalate (Delta T-c approximate to 10 K and Delta d approximate to 3.6 Angstrom) and the HgBr2 one (Delta T-c approximate to 6 K and Delta d approximate to 6.3 Angstrom), it can be concluded that the change in T-c upon intercalation clearly depends on the hole concentration due to the charge transfer between host and guest, rather than the interblock electronic coupling due to the lattice expansion.
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页码:3783 / 3787
页数:5
相关论文
共 28 条
[1]   SUBSTITUTIONAL AND RELATED STUDIES IN CUPRATE SUPERCONDUCTORS [J].
AGARWAL, SK ;
NARLIKAR, AV .
PROGRESS IN CRYSTAL GROWTH AND CHARACTERIZATION OF MATERIALS, 1994, 28 (03) :219-274
[2]  
ANDO Y, 1992, SOLID STATE COMMUN, V82, P531
[3]   SUPERCONDUCTIVITY AND RESISTIVITY STUDIES IN BI2SR2CA1-XMXCU2O8+Y (M=EU, DY, TM AND 0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-0.6) [J].
AWANA, VPS ;
AGARWAL, SK ;
RAY, R ;
GUPTA, S ;
NARLIKAR, AV .
PHYSICA C, 1992, 191 (1-2) :43-51
[4]   XANES AND EXAFS STUDIES ON A NEW SUPERCONDUCTING INTERCALATION COMPOUND, AGIBI2SR2CACU2OY [J].
CHOY, JH ;
KIM, DK ;
HWANG, SJ ;
HWANG, SH ;
HUR, NH .
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 1994, 235 :1023-1024
[5]   EVOLUTION OF HIGH T-C SUPERCONDUCTIVITY OF BI4SR3-XLAXCA3CU4OY UPON IODINE INTERCALATION [J].
CHOY, JH ;
HWANG, SJ ;
KIM, DH ;
PARK, HH .
SYNTHETIC METALS, 1995, 71 (1-3) :1589-1590
[6]   A NEW HIGH-T-C SUPERCONDUCTING INTERCALATION COMPOUND [J].
CHOY, JH ;
PARK, NG ;
HWANG, SJ ;
KIM, YI .
SYNTHETIC METALS, 1995, 71 (1-3) :1551-1553
[7]   CU K-EDGE X-RAY-ABSORPTION SPECTROSCOPIC STUDY ON THE OCTAHEDRALLY COORDINATED TRIVALENT COPPER IN THE PEROVSKITE-RELATED COMPOUNDS LA2LI0.5CU0.5O4 AND LACUO3 [J].
CHOY, JH ;
KIM, DK ;
HWANG, SH ;
DEMAZEAU, G .
PHYSICAL REVIEW B, 1994, 50 (22) :16631-16639
[8]   UNUSUAL HIGH OXIDATION-STATE OF IODINE INTERCALATED IN THE BI2SR2CACU2OX SUPERCONDUCTOR [J].
CHOY, JH ;
KANG, SG ;
KIM, DH ;
HWANG, SJ ;
ITOH, M ;
INAGUMA, Y ;
NAKAMURA, T .
JOURNAL OF SOLID STATE CHEMISTRY, 1993, 102 (01) :284-287
[9]   NEW SUPERCONDUCTING INTERCALATION COMPOUNDS - (HGX(2))(0.5)BI2SR2CACU2OY (X=BR AND I) [J].
CHOY, JH ;
PARK, NG ;
HWANG, SJ ;
KIM, DH ;
HUR, NH .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1994, 116 (25) :11564-11565
[10]   MOLECULAR LAYER-BY-LAYER ENGINEERING OF SUPERCONDUCTING AND SUPERIONIC MATERIALS IN THE (AGI)BI2SR2CACU2OY SYSTEM [J].
CHOY, JH ;
PARK, NG ;
KIM, YI ;
HWANG, SH ;
LEE, JS ;
YOO, HI .
JOURNAL OF PHYSICAL CHEMISTRY, 1995, 99 (20) :7845-7848