MN2+ AS A PROBE IN RBCAF3 - LOCAL ORDER-PARAMETER OF THE STRUCTURAL PHASE-TRANSITION MEASURED BY ENDOR

被引：9

作者：

LAHOZ, F ^{[1
]}

ALONSO, PJ ^{[1
]}

ALCALA, R ^{[1
]}

PAWLIK, T ^{[1
]}

SPAETH, JM ^{[1
]}

机构：

[1] UNIV GESAMTHSCH PADERBORN,FACHBEREICH PHYS,W-4790 PADERBORN,GERMANY

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1995年 / 7卷 / 45期

关键词：

D O I：

10.1088/0953-8984/7/45/019

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The 195K cubic-to-tetragonal structural phase transition (SPT) in RbCaF3 crystals has been investigated by electron nuclear double resonance (ENDOR) using Mn2+ as a probe. The rotational angle of the fluorine octahedra which is the local order parameter of the transition, has been determined at 40 K for the first and second shells of F- ions surrounding the Mn2+ impurities. The values obtained are 5.1 degrees +/- 0.2 degrees for the first shell and 7.4 degrees +/- 1 degrees for the second shell. The thermal evolution of the first shell angle at temperatures close to that of the SPT has also been studied. The results have been compared with those in RbCdF3:Mn2+. The first shell angle measured at 40 K is similar to the one in RbCdF3:Mn2+. The second shell angle is almost double that in RbCdF3:Mn2+. Covalency effects through Cd2+ ions are suggested to account for this difference.

引用

页码：8637 / 8645

页数：9

共 11 条

[1] ENDOR INVESTIGATIONS ON HYPERFINE INTERACTIONS IN CSCAF3 DOPED WITH MN-2+ [J].

AOKI, H ;

ARAKAWA, M ;

YOSIDA, T .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1983, 52 (06) :2216-2220

[2]

BARRIUSO MJ, 1983, PHYS REV B, V29, P3623

[3] PHASE-TRANSITIONS IN RBCAF3 .1. OPTICAL STUDIES [J].

BATES, JB ;

MAJOR, RW ;

MODINE, FA .

SOLID STATE COMMUNICATIONS, 1975, 17 (11) :1347-1350

[4] TEMPERATURE-DEPENDENCE OF THE STRUCTURES OF RBCAF3, AND THE DETERMINATION OF THE LOW-TEMPERATURE PHASES [J].

BULOU, A ;

RIDOU, C ;

ROUSSEAU, M ;

NOUET, J ;

HEWAT, AW .

JOURNAL DE PHYSIQUE, 1980, 41 (01) :87-96

[5] ELECTRON-NUCLEAR DOUBLE RESONANCE SPECTRUM OF AN F-CENTER ELECTRON IN ALKALI HALIDES (WITH NACL STRUCTURE) [J].

FEUCHTWANG, TE .

PHYSICAL REVIEW, 1962, 126 (05) :1628-&

[6]

LAHOZ F, 1995, IN PRESS RAD EFF DEF, V133

[7]

Owens F. J, 1979, MAGNETIC RESONANCE P

[8] EPR INVESTIGATIONS OF A STRUCTURAL PHASE-CHANGE IN RBCAF-3, RBCDF-3, AND TLCDF-3 [J].

ROUSSEAU, JJ ;

ROUSSEAU, M ;

FAYET, JC .

PHYSICA STATUS SOLIDI B-BASIC RESEARCH, 1976, 73 (02) :625-631

[9]

Spaeth J.-M., 1992, SPRINGER SERIES SOLI, V43

[10] ENDOR INVESTIGATION OF THE STRUCTURAL PHASE-TRANSITION IN RBCDF3 [J].

STUDZINSKI, P ;

SPAETH, JM .

JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1986, 19 (32) :6441-6449

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