ANOMALOUS RESISTIVITY PEAKS, LOCALIZATION TRANSITIONS, AND THE ELECTRONIC-STRUCTURE OF SUBSTOICHIOMETRIC LANTHANUM TRIHYDRIDES

被引：42

作者：

SHINAR, J ^{[1
]}

DEHNER, B ^{[1
]}

BARNES, RG ^{[1
]}

BEAUDRY, BJ ^{[1
]}

机构：

[1] IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011

来源：

PHYSICAL REVIEW LETTERS | 1990年 / 64卷 / 05期

关键词：

D O I：

10.1103/PhysRevLett.64.563

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The resistivity (T) of LaHx (2.80x2.90) was determined from Q-factor measurements at 100 K<T<700 K. Its temperature coefficient >0 is small at T200 K, and (T) peaks at some T between 220 and 260 K. The peak narrows with increasing x and is extremely sharp for x<>2.86. At higher temperatures the behavior of (T) is consistent with variable-range hopping. It is suggested that a delocalized band of states at EF, associated with the superlattice of octahedral vacancies, becomes localized and its mobility is quenched when the superlattice collapses above 24020 K. © 1990 The American Physical Society.

引用

页码：563 / 566

页数：4

共 47 条

[11] NEUTRON-DIFFRACTION STUDY OF NONSTOICHIOMETRIC CERIUM HYDRIDE [J].

CHEETHAM, AK ;

FENDER, BEF .

JOURNAL OF PHYSICS PART C SOLID STATE PHYSICS, 1972, 5 (05) :L35-&

[12] DEUTERIUM SUPER-LATTICE FORMATION IN LANTHANUM TRIDEUTERIDES - THE NUCLEAR MAGNETIC-RESONANCE EVIDENCE [J].

DEGROOT, DG ;

BARNES, RG ;

BEAUDRY, BJ ;

TORGESON, DR .

JOURNAL OF THE LESS-COMMON METALS, 1980, 73 (02) :233-241

[13] NEUTRON-DIFFRACTION EVIDENCE FOR A STRUCTURAL PHASE-TRANSFORMATION IN STOICHIOMETRIC LAD3 AT 230-K [J].

DIDISHEIM, JJ ;

YVON, K ;

FISCHER, P ;

HALG, W ;

SCHLAPBACH, L .

PHYSICS LETTERS A, 1980, 78 (01) :111-114

[14] A PHENOMENOLOGICAL MODEL FOR THE MEYER-NELDEL RULE [J].

DYRE, JC .

JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1986, 19 (28) :5655-5664

[15] CONDUCTIVITY IN DISORDERED-SYSTEMS [J].

ECONOMOU, EN ;

SOUKOULIS, CM ;

ZDETSIS, AD .

PHYSICAL REVIEW B, 1985, 31 (10) :6483-6489

[16] TRANSPORT STUDIES OF LA2-XSRXCUO4 NEAR THE INSULATOR-METAL-SUPERCONDUCTOR TRANSITION [J].

ELLMAN, B ;

JAEGER, HM ;

KATZ, DP ;

ROSENBAUM, TF ;

COOPER, AS ;

ESPINOSA, GP .

PHYSICAL REVIEW B, 1989, 39 (13) :9012-9016

[17]

FEDOTOV VK, 1982, FIZ TVERD TELA, V24, P1252

[18] ELECTRONIC STATES IN NONSTOICHIOMETRIC RARE-EARTH HYDRIDES [J].

FUJIMORI, A ;

TSUDA, N .

JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1981, 14 (10) :1427-1434

[19] ELECTRONIC-STRUCTURE OF RARE-EARTH HYDRIDES - LAH2 AND LAH3 [J].

GUPTA, M ;

BURGER, JP .

PHYSICAL REVIEW B, 1980, 22 (12) :6074-6084

[20]

Hayes W., 1974, CRYSTALS FLUORITE ST

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