LATTICE INSTABILITY AND LOW-TEMPERATURE PHASE-TRANSITION IN PR2NIO4

被引:25
作者
MARTINEZ, JL [1 ]
FERNANDEZDIAZ, MT [1 ]
RODRIGUEZCARVAJAL, J [1 ]
ODIER, P [1 ]
机构
[1] CNRS, CTR RECH PHYS HAUTES TEMP, F-45071 ORLEANS, FRANCE
来源
PHYSICAL REVIEW B | 1991年 / 43卷 / 16期
关键词
D O I
10.1103/PhysRevB.43.13766
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Some layered perovskites with general formulas R2MO4 (R = rare earth; M = Cu, Ni, or Co) undergo a sequence of structural phase transitions. The high-temperature tetragonal phase (HTT) is transformed to the low-temperature orthorhombic phase (LTO) at T(c2), and after further cooling there is a new low-temperature tetragonal (LTT) phase at T(c1). The soft mode behavior at T(c1) is observed with inelastic neutron scattering in this family of compounds for Pr2NiO4. One of the two branches, of the doubly degenerate X-point phonon of the HTT phase, becomes softer at T(c1). In the LTT phase, this phonon branch is stiffer and appears at higher energy. The orthorhombic strain and the soft-mode frequency undergo a discontinuous jump at the transition temperature, indicating a clear first-order character of this phase transformation. From these data, the dynamics of the LTO --> LTT phase transformation in the insulator Pr2NiO4+delta (delta = 0) can be well characterized. For La(2-x)Ba(x)CuO4 (x = 1/8) the same kind of transition is observed, which coincides with the suppression of the superconducting state, but the presence of free charge carriers may complicate the interpretation of the results in this case.
引用
收藏
页码:13766 / 13769
页数:4
相关论文
共 29 条
[1]   MAGNETIC CORRELATIONS IN LA2NIO4+DELTA [J].
AEPPLI, G ;
BUTTREY, DJ .
PHYSICAL REVIEW LETTERS, 1988, 61 (02) :203-206
[2]  
[Anonymous], 1981, STRUCTURAL PHASE TRA
[3]   A NEW STRUCTURAL MODIFICATION OF SUPERCONDUCTING LA2-XMXCUO4 [J].
AXE, JD ;
COX, DE ;
MOHANTY, K ;
MOUDDEN, H ;
MOODENBAUGH, AR ;
XU, Y ;
THURSTON, TR .
IBM JOURNAL OF RESEARCH AND DEVELOPMENT, 1989, 33 (03) :382-388
[4]   STRUCTURAL PHASE-TRANSFORMATIONS AND SUPERCONDUCTIVITY IN LA2-XBAXCUO4 [J].
AXE, JD ;
MOUDDEN, AH ;
HOHLWEIN, D ;
COX, DE ;
MOHANTY, KM ;
MOODENBAUGH, AR ;
XU, YW .
PHYSICAL REVIEW LETTERS, 1989, 62 (23) :2751-2754
[5]   ELECTRON MECHANISM FOR THE STRUCTURAL PHASE-TRANSITIONS IN LA2-XBAXCUO4 [J].
BARISIC, S ;
ZELENKO, J .
SOLID STATE COMMUNICATIONS, 1990, 74 (05) :367-370
[6]   SOFT-PHONON BEHAVIOR AND TRANSPORT IN SINGLE-CRYSTAL LA2CUO4 [J].
BIRGENEAU, RJ ;
CHEN, CY ;
GABBE, DR ;
JENSSEN, HP ;
KASTNER, MA ;
PETERS, CJ ;
PICONE, PJ ;
THIO, T ;
THURSTON, TR ;
TULLER, HL ;
AXE, JD ;
BONI, P ;
SHIRANE, G .
PHYSICAL REVIEW LETTERS, 1987, 59 (12) :1329-1332
[7]   LATTICE INSTABILITY AND SOFT PHONONS IN SINGLE-CRYSTAL LA2-XSRXCUO4 [J].
BONI, P ;
AXE, JD ;
SHIRANE, G ;
BIRGENEAU, RJ ;
GABBE, DR ;
JENSSEN, HP ;
KASTNER, MA ;
PETERS, CJ ;
PICONE, PJ ;
THURSTON, TR .
PHYSICAL REVIEW B, 1988, 38 (01) :185-194
[8]  
DEANDRES A, 1991, EUR J SOL STATE INOR, V28, P179
[9]  
DEANDRES A, IN PRESS J PHYS COND
[10]   CRYSTAL-GROWTH OF LA2NIO4 BY THE FLOATING ZONE METHOD WITH A CW CO2-LASER - PRELIMINARY CHARACTERIZATIONS [J].
DEMBINSKI, K ;
BASSAT, JM ;
COUTURES, JP ;
ODIER, P .
JOURNAL OF MATERIALS SCIENCE LETTERS, 1987, 6 (12) :1365-1367