Large low temperature specific heat in the negative thermal expansion compound ZrW2O8

被引:158
作者
Ramirez, AP [1 ]
Kowach, GR [1 ]
机构
[1] AT&T Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA
关键词
D O I
10.1103/PhysRevLett.80.4903
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The specific heat C(T) of ZrW2O8 is measured from 1 to 300 K. Below 50 K, C(T) is dominated by an Einstein term of energy (h) over bar omega(0) = 5 meV, which represents 6.5% of the total lattice degrees of freedom. This concentration of phonon spectral weight at low energies is unusual in materials of cubic structure and is a possible indication of "rigid unit modes" discussed for underconstrained crystal structures. The relationship between C(T) and the large negative thermal expansion in:this compound is discussed.
引用
收藏
页码:4903 / 4906
页数:4
相关论文
共 16 条
[1]   ANISOTROPIC THERMAL EXPANSION OF PYROLYTIC GRAPHITE AT LOW TEMPERATURES [J].
BAILEY, AC ;
YATES, B .
JOURNAL OF APPLIED PHYSICS, 1970, 41 (13) :5088-&
[2]   THERMAL-EXPANSION OF SOLIDS AT LOW-TEMPERATURES [J].
BARRON, THK ;
COLLINS, JG ;
WHITE, GK .
ADVANCES IN PHYSICS, 1980, 29 (04) :609-730
[3]   LOW-TEMPERATURE SPECIFIC-HEAT OF C-60 [J].
BEYERMANN, WP ;
HUNDLEY, MF ;
THOMPSON, JD ;
DIEDERICH, FN ;
GRUNER, G .
PHYSICAL REVIEW LETTERS, 1992, 68 (13) :2046-2049
[4]   ON THE THERMAL EXPANSION OF SOLIDS [J].
BLACKMAN, M .
PROCEEDINGS OF THE PHYSICAL SOCIETY OF LONDON SECTION B, 1957, 70 (09) :827-832
[5]   Compressibility, phase transitions, and oxygen migration in zirconium tungstate, ZrW2O8 [J].
Evans, JSO ;
Hu, Z ;
Jorgensen, JD ;
Argyriou, DN ;
Short, S ;
Sleight, AW .
SCIENCE, 1997, 275 (5296) :61-65
[6]   Negative thermal expansion in ZrW2O8 and HfW2O8 [J].
Evans, JSO ;
Mary, TA ;
Vogt, T ;
Subramanian, MA ;
Sleight, AW .
CHEMISTRY OF MATERIALS, 1996, 8 (12) :2809-2823
[7]   SOFT PHONON MODES AND 110 DEGREES K PHASE TRANSITION IN SRTIO3 [J].
FLEURY, PA ;
SCOTT, JF ;
WORLOCK, JM .
PHYSICAL REVIEW LETTERS, 1968, 21 (01) :16-&
[8]   HEAT-CAPACITY ANALYSIS OF A LARGE NUMBER OF A15-TYPE COMPOUNDS [J].
JUNOD, A ;
JARLBORG, T ;
MULLER, J .
PHYSICAL REVIEW B, 1983, 27 (03) :1568-1585
[9]   NEGATIVE THERMAL-EXPANSION AND PHASE-TRANSITIONS IN THE ZRV2-XPXO7 SERIES [J].
KORTHUIS, V ;
KHOSROVANI, N ;
SLEIGHT, AW ;
ROBERTS, N ;
DUPREE, R ;
WARREN, WW .
CHEMISTRY OF MATERIALS, 1995, 7 (02) :412-417
[10]   Negative thermal expansion from 0.3 to 1050 Kelvin in ZrW2O8 [J].
Mary, TA ;
Evans, JSO ;
Vogt, T ;
Sleight, AW .
SCIENCE, 1996, 272 (5258) :90-92