Temperature and field dependence of the magnetic susceptibility of TiBe/sub 2/ under high pressure

Journal Article · Tue Nov 15 04:00:00 EST 1983 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.28.5814· OSTI ID:5599013

Gerhardt, W; Schilling, J S; Olijnyk, H; Smith, J L

The magnetic susceptibility chi(T,P) of TiBe/sub 2/ is determined at a field strength of 2.1 T as a function of both temperature from 3 to 300 K and hydrostatic pressure up to 1.3 GPa (13 kbar). At low temperatures, chi is found to decrease under pressure, the degree of depression diminishing rapidly with increasing temperature from partiallnchi/partialP = (-9.6 +- 0.4)%/GPa at 3 K to (0 +- 0.3)%/GPa at 300 K. Pressure is also found to suppress strongly the low-temperature anomaly in the field dependence of chi(H) at 5.6 T. An increase in the spin-fluctuation temperature with pressure is indicated, partialT/sub SF//partialPapprox. =+3.5 K/GPa, where T/sub SF/(0)approx. =24 K, although it is not possible to account for the present results in terms of the variation of a single characteristic energy. The Stoner factor appears to decrease rapidly under pressure. The pressure dependence of the lattice parameter for TiBe/sub 2/ at room temperature is determined up to 27 GPa, yielding the initial compressibility K = (7.6 +- 0.4) x 10/sup -3/ GPa/sup -1/. It is shown that the ferromagnetism of TiBe/sub 2-x/Cu/sub x/ for x> or =0.15 cannot be due solely to the volume expansion associated with increasing x. Preliminary measurements indicate that substituting Mn for Ti in TiBe/sub 2/ causes a strong decrease in the total magnetization in analogy with previous studies involving Fe substitution. A simple qualitative model of the electronic structure of TiBe/sub 2/ near E/sub F/ is suggested. TiBe/sub 2/ is not superconducting at temperatures above 150 ..mu..K.

• Research Organization: Experimentalphysik IV, Universitat Bochum, D-4630 Bochum 1, West Germany
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5599013
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 28:10; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BERYLLIUM COMPOUNDS
COMPRESSIBILITY
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
LOW TEMPERATURE
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MAGNETIZATION
MECHANICAL PROPERTIES
MEDIUM TEMPERATURE
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE
VERY HIGH PRESSURE
VERY LOW TEMPERATURE