PANDA

Magnetic properties

• Spin-waves, magnetic excitations in frustrated, topological und low-dimensional systems
• Crystal field excitations
• Excitations in low-dimensional systems
• Magnetic vs nuclear scattering

Lattice dynamics

• Phonon dispersion
• Magneto-elastic coupling
• Polarisations vectors

General

• Critical scattering at phase transitions
• Magnon – phonon interaction
• Soft mode
• Central peak
• Diffraction with analyser:
  • dE close to 0
  • High E & Q resolution
  • Extremely low background

The sample table of PANDA allows for a variety of sample environments and may easily be adapted to user-specific devices.

Among others, PANDA offers routinely operated sample environment for:

• Available temperature range: 50 mK (dilution insert, see below) up to more than 1300 K (high-temperature furnace)
• Maximal vertical magnetic field: 12 T
• Available cryostats:
  • Closed cycle cryostat: 3.5 K < T < 300 K
  • ³He insert: 450 mK < T < 300 K
  • Dilution insert: 50 mK < T < 6 K
  • ADR-cryostat: 300 mK < T < 300 K

Monochromators

• PG(002) (d = 3.355 Å)
  • 1.5 Å^-1 < k_i < 4.0 Å^-1
  • Variable horizontal and vertical focussing
• Cu111 (d = 2.08 Å)
  • 1.8 Å^-1 < k_i < 7 Å^-1
  • Variable horizontal and vertical focussing
• Si111 (d = 3.13 Å)
  • 1.5 Å^-1 < k_i < 5 Å^-1
  • Fixed vertical and variable horizontal focussing
• Heusler (d = 3.35 Å, polarised neutrons)
  • 1.5 Å^-1 < k_i < 4.0 Å^-1
  • Variable vertical focussing

Analysers

• PG(002)
  • -130° < 2Θ_A < 100°
  • 1.05 Å^-1 < k_f
  • Variable horizontal focussing
• Heusler (polarised neutrons)
  • -130° < 2Θ_A < 100°
  • 1.05 Å^-1 < k_f
  • Variable horizontal focussing

Detectors

• 1” ³He tube (focussing mode)
• 2” ³He tube (collimated mode))

Main parameters

• Scattering angle at the sample: 5°< 2Θ_S < 125° (moveable beam-stop)
• Energy transfer: up to 35 meV (depending on k_i)
• Momentum transfers: up to Q = 7 Å^-1 (depending on k_i)

Filters for higher-order suppression

• PG (l = 60 mm): k_f = 2.57 Å^-1 or 2.662 Å^-1
• Be (closed-cycle cryostat, T ≤ 45 K): k_f ≤ 1.55 Å^-1
• BeO (liq.-N₂ cooled): k_f ≤ 1.33 Å^-1

Monochromators

• PG(002) (d = 3.355 Å)
  • 1.05 Å^-1 < k_i < 4.0 Å^-1
  • Variable horizontal and vertical focussing
• Cu111 (d = 2.08 Å)
  • 1.8 Å^-1 < k_i < 7 Å^-1
  • Variable horizontal and vertical focussing
• Si111 (d = 3.13 Å)
  • 1.2 Å^-1 < k_i < 5 Å^-1
  • Fixed vertical and variable horizontal focussing
• Heusler (d = 3.35 Å, polarised neutrons)
  • 1.1 Å^-1 < k_i < 4.0 Å^-1
  • Variable vertical focussing

Analysers

• PG(002)
  • -130° < 2Θ_A < 100°
  • 1.05 Å^-1< k_f
  • Variable horizontal focussing
• Heusler (polarised neutrons)
  • -130° < 2Θ_A < 100°
  • 1.05 Å^-1 < k_f
  • Variable horizontal focussing

Detectors

• 1” ³He tube (focussing mode)
• 2” ³He tube (collimated mode)

Main parameters

• Scattering angle at the sample: 5°< 2Θ_S < 125° (moveable beam-stop)
• Energy transfer: up to 18 meV (depending on k_i)
• Momentum transfers : up to Q = 7 Å^-1 (depending on k_i)

Filters for higher-order suppression

• PG (l = 60 mm): k_f = 2.57 Å^-1 or 2.662 Å^-1
• Be (closed-cycle cryostat, T ≤ 45 K): k_f ≤ 1.55 Å^-1
• BeO (liq.-N₂ cooled): k_f ≤ 1.33 Å^-1